Author Archives: Mr Cylinder

How to Buy Hot Water Cylinders Online

Online shopping is now a huge part of the new norm. More and more customers prefer to shop online because of convenience plus the larger selection of items they can choose from.  However, there are still some folks who have a hard time figuring out if online shopping works for them. This is especially true for those who need to purchase home equipment such as hot water cylinders.

In most cases, buyers looking for hot water cylinders prefer to head over to their favourite shops to check their options. But, in truth, it’s very much possible to shop for such items online. And it’s quite simple to do so. Check out the short online shopping guide for hot water cylinders. 

Buying trusted brands

The first thing you need to do when shopping online for specialised items such as heat pumps and hot water cylinders is to look for trusted brands.

Look for water heating equipment brands that are tried and tested by customers, that way you get the best value for your money. A good way to assess a brand’s credibility is doing a quick research online. Find out what customers say about them. Are they getting legitimate positive reviews? Do people say negative comments about the quality of their products.  

Check their web presence too. The majority of established companies that offer hot water cylinders and other water pump equipment have a strong online presence both in their website and social media. They also provide detailed descriptions of their product features and even troubleshooting guides.

Some of the best water heating system brands in the market include:

  • Greenglo
  • Dux
  • Rinnai
  • Rheem
  • Paloma
  • Chromagen

Long standing reputation

Besides checking the brand of the product, you should also look at the credibility and reliability of the shop. Find out how fast can they deliver the product? Do they provide an installation service? How about their orders and returns policy? Have you heard of customers complaining about a product they received?

It’s also crucial to read a shop’s shipping policy. Find out how long it takes for the shop to deliver an item. Which couriers do they use? Do they have their own courier? Do they offer international shipping? Is it possible to track your order?

Make sure to check everything about the shop before you complete a transaction. This way, you can set your expectations and find a seller that can meet your demands.

What to look for when buying hot water cylinders online

Water cylinders and heating systems are considered as highly critical appliances used in homes. Choosing the right one can mean a lot for you and everyone else living in your house. So, here’s a quick breakdown of everything you need to consider when shopping for a hot water cylinder online:

  • The cylinder’s water holding capacity – Typically, water heating cylinders can hold around 45 to 500 liters. There are also modern models that have a higher water holding capacity. When considering the water holding capacity of cylinder, you need to have a rough estimate of the peak water usage of your household.
  • The energy source of the heater – Water heaters can either powered by electricity, solar power or gas. It can be expensive to switch from one power source to another, so you need to figure out which option works best for you before you shop.
  • Drain valves – Check the product description to see whether the heating cylinder comes with brass or plastic drain valve. As much as possible, you should stay away plastic valves because they tend to wear out faster.
  • Product warranty – Like in buying any product, you need to check the warranty period. In most cases, water heating cylinders come with product warranties lasting anywhere between 3 to 12 years.
  • Main pressure vs Low pressure – Unvented or main pressure systems deliver hot or cold water to the outlets at a consistent pressure. Low pressure systems on one hand can come in two types. The first one makes use of pressure-reducing water valves to minimise the pressure coming from the main water source. The other one makes use gravity to feed water from the header tank to the storage water tank.

Top 5 Hot Water Cylinders in NZ

Rheem 160L Stellar Main Pressure Gas Hot Water Cylinder

If you are looking for a gas-powered water heating unit, the Rheem 160L Stellar is a good option. It can support peak water usage for around 3 to 6 people. It comes with 10-year product warranty plus 5-year labour warranty. The product is among the most efficient hot water cylinder in New Zealand as it comes with high flow rate. It works perfectly for one-bathroom homes with high to moderate water consumption.

Rinnai 180L Duplex Hot Water Cylinder

The Rinnai 180L 2KW duplex hot water cylinder is an electric-powered equipment. It’s also heat pump ready and made from premium quality stainless steel. It measures 550 mm x 1295 mm and can hold up to 180 litres. Additionally, it comes with a 2KW heating element.

Rheem 27 Continuous Flow Gas Heater

Need an economical gas heater? The Rheem 27 Continuous Flow Gas Heater is one of the finest options in the market. It is equipped with a digital display and an overheat protection system. You can either use LPG or natural gas to power the heating element of the equipment.

Green Glo Solar Ready Water Heating Cylinder

If you prefer using a solar-ready water heater cylinder, you can check out the Green Glo 180S. It has an enameled steel case and has a maximum heat exchange temperature of 95 degrees Celsius. The cylinder has a 520 mm diameter and 1660 mm height.

Dux Proflo 315L 3.6 KW Water Heating Cylinder

The Dux Proflo 315L cylinder is a versatile heating equipment that can be used in an outdoor or indoor setup. It comes with a 7-year product warranty plus 1-year labour warranty. It features a full flow water pressure system plus an enameled steel casing to ensure its durability.    

Need to buy a water heating cylinder today? Get in touch with our team or check out our product catalogue for hot water cylinders in New Zealand. We offer an extensive selection of products that would fit your needs, plus we can also install the equipment upon your request.

The Importance of Pressure Reducing Valves

Hot water cylinders are utilised in many New Zealand homes. A series of pipes are responsible for the transport of water to your property’s plumbing.  Whether you rely on public water supply or use pumps, water travelling to your property should be regulated to protect your existing fixtures and hot water system. This includes the regulation of water pressure and quality.  

The video above shows just how bad a leak can be when things go wrong. This is an old pressure reducing valve on a low-pressure hot water cylinder that could no longer cope with the incoming pressure. 

Why Are Pressure Reducing Valves So Important ?

In the city, most homes are supplied with a public water main feed. This feed is not pressure regulated, nor is it guaranteed to supply debris free water. This ultimately means that you need to take measures to protect your fixtures and hot water system from the incoming quality and pressure of your public water supply. 

How Does a Pressure Limiting (Reducing) Valve Work?

This Diagram of an Ajax type pressure reducing valve nicely explains what happens to incoming pressure. 

Hot Water Systems

If you have low pressure you will most likely know that there is potential for more pressure. Knowing this, it becomes pretty obvious that there is a device which limits the incoming pressure. This device is a pressure reducing valve and is rated in meters. A common rating is 7.5 meters which in other words means that the pressure is regulated to 7.5 meters of atmospheric pressure. 

 

Those of us that enjoy mains pressure are less concerned about regulating pressure, we may believe that the more pressure the better or that it does not need to be regulated, but is that entirely true?   

Appliance and Fixture Ratings

Your hot water system, your appliances, your taps and even your toilets are all pressure rated and should be regulated. This means that they will only cope with a certain amount of pressure before there is potential for failure. This may include a scenario such as in the above video where there is a high risk for flooding when failure happens. 

Please ask Hot Water Cylinders NZ if you are unsure about how to rate any of your plumbing related fixtures and hot water system. 

Where Do I Install the Pressure Reducing Valve?

Pressure reducing or limiting valves will protect your home and everything connected to your plumbing within. So it makes sense to install this valve as upstream as possible within the plumbing system. Typically this would be directly after the water meter on your public supply. 

Often, with low pressure systems this is not desirable at all because one may still want to enjoy “mains pressure” on the cold but continue to accommodate the low pressure hot water cylinder on the hot side in which case the low pressure reducing valve will only be installed on the cold water inlet of the hot water cylinder. These systems are well known as “unbalanced hot water systems”. Another issue with low pressure valves is that they are large and “bulky” making it difficult to install within a meter box where they are prone to damage and sensitive to pressure fluctuation. 

Every home should be protected from the effects of incoming pressure which can majorly increase without notice. 

If you need advice or are unsure about which valve suits your circumstances best, give us a ring and we can help. Hot Water Cylinders NZ also offer valve replacement and repairs. 

Here a list of valves which we may recommend.

RMC Products

RMC has a variety of pressure reducing valves that cater to your needs. Not only do they have pressure-relieving valves, but they also have a variety of products that go with, or have more features that will make it multifunctional.

Here are some of RMC’s pressure reducing valves:

RMC 4 in 1 Hot Inlet Control Valve c/w Adj Limiting 20mm CV75

 Manufacturer: RMC

 Product Specs:

 The Filling-Group type 2128 is designed to automatically fill and refill central heating installations. The Filling-Group is permanently connected to the heating installation. The connection to the potable water system is made with a hose. When the supply pressure falls below the pressure of the heating installation during the filling operation, the water goes into the potable water system. 

 

RMC Cold Water Expansion Valve 700kpa CE75H-700-KPA

Manufacturer: RMC

This product comes in 2 variations, the RMC Cold Water Expansion Valve 700kpa CE75H- 700-KPA and the RMC Cold Water Expansion Valve 800kpa CE75H- 800-KPA.

RMC Hot Water Cylinder Valve Package

 Manufacturer: RMC

 This pack includes 4 in 1 Control Valve, Pressure Limiting Valve, Tempering Valve, Cold Water Expansion Valve, and Male/Female Ball Valve.

RMC HT575 Pressure & Temp Relief Valve 20mm 850kpa HT705

 Manufacturer: RMC

RMC’s Pressure and Temperature Relief (P & T Relief) Valves are safety controls that ensure that the temperature of the water in a pressurized unvented water heater cannot exceed 99° C in the event that the normal thermostatic controls fail.

These valves may be used to guard against over temperature and over-pressure hazards wherever water is stored in unvented containers. This is a requirement of Australian Standard AS 3500-4. RMC P & T Relief Valves are available in 15 mm and 20 mm configurations.

RMC Low Pressure Reducing Feed Valve 7.6m 76kpa D505NZ

 Manufacturer: RMC

This comes in two variations, RMC Low Pressure Reducing Feed Valve 7.6m 76kpa D505NZ and the RMC Low Pressure Reducing Feed Valve 3.7m 37kpa D503NZ.

RMC Pressure Limiting Valve Adj 15mm 155-550kpa 80deg PRV015

 Manufacturer: RMC

The RMC Pressure Reducing Valve is used in water systems to limit the downstream pressure to the pre-set maximum. It compensates for fluctuating upstream pressure to maintain constant maximum outlet pressure.

This is suitable for demanding commercial and industrial applications and multi-unit dwellings and can be used to reduce pressure upstream of commercial and industrial devices such as dosing apparatuses, high-pressure cleaners, and laboratory equipment.

The RMC Pressure Reducing Valve can deliver high flow rates with minimal head loss. This is available in 15 mm, 20 mm, 25 mm, 32 mm, 40 mm, and 50 mm configurations with female BSP thread connections.

RMC Pressure Limiting Valve Adj 20mm 155-550kpa SYR-310620

 Manufacturer: RMC

A range of economy domestic/light commercial quality pressure reducing valves, suitable for various applications at temperatures up to 40°C (60°C for 1 hour max.) The valves are designed for a low-pressure drop, so minimizing noise levels.

The pressure-balanced diaphragm construction and drop-tight design also ensure constant outlet pressure is maintained across all flow rates and no-flow conditions.

All models feature cartridge construction, fully serviceable strainer and female BSP connections for ease of installation and maintenance and are suitable for use with warm water, fuel oil, compressed air, neutral gases and neutral non-sticking liquids.

Why Choose Hot Water Cylinders NZ?

Here at Hot Water Cylinders NZ, we give you the best quality service and the assurance of world-class products and customer service. We not only provide pressure controllers, but also main pressure cylinders, low-pressure cylinders, gas water heating, and many more. We aim to serve you because you are our priority. That is the type of service you can get with New Zealand’s #1 hot water heating and plumbing specialist.

Introducing Bosch Electronic Highflow Continuous Flow Hot Water Heater

Bosch is undoubtedly one of the leading brands of water heaters in the market today and boasts excellent energy efficiency ratings. This enables Bosch water heaters to provide significant savings on running costs daily and preserves the environment too.

In the past, most New Zealand homes have chosen storage tanks as their hot water system. Today, Bosch is changing the way households use hot water – offering the widest range of continuous flow hot water systems.

Why Choose Bosch?

The recent influx of continuous flow hot water systems provides an efficient and cost-effective alternative to traditional gas and electric storage units. If you’re building a new home, renovating, or merely replacing your existing hot water system, Bosch is the right brand for the job. When it comes to hot water systems, Bosch offers a gas continuous flow water heater to suit your every need.

Bosch continuous flow systems only heat enough water for your every need, so you’ll never run out of hot water. Your entire household can shower at the same time and enjoy hot water instead of enduring a cold shower!

Continuous flow hot water systems occupy less space as compared with traditional storage hot water units. They can easily be mounted outside or, if you want, you can conveniently install internal systems in a cupboard (flueing required).

Electronic continuous flow systems can also provide you with a precise temperature adjustment feature using a temperature controller.

Here are the advantages you will enjoy when you choose to install a Bosch continuous flow hot water system:

  • Heat water only as required
  • Never run out of hot water
  • Save money on energy costs
  • Space-saving, compact design
  • Precise temperature control* giving parents added peace of mind for their children’s safety
  • Extensive range of accessories to add to the appearance of your home

Here are the disadvantages of installing a Bosch continuous flow hot water system:

  • There is some delay before the water is sufficiently heated to the right temperature
  • More water is wasted
  • It is not suitable for households with high hot water needs

Here are a few things to consider when choosing the right hot water system for your home:

How many bathrooms does your home have?

Bosch continuous flow gas hot water systems provide hot water at the turn of a tap. However, we recognise that there are times where heavy usage occurs. For example, in busy morning times, there may be more than one shower operating at the same time. It is important to select a hot water unit with a capacity to suit your household’s needs.

A two- or three-bathroom home will require a larger system, such as a Bosch 26e.

What type of Bosch Hot Water unit is right for you?

If your home has one bathroom, a Bosch 17e or 21e may be suitable. For 2-3-bathroom homes in colder climates, Bosch recommend a larger hot water system, such as a 26e.

Is there a spa bath* or large bath installed in the home?

Bosch recommends the 26e or 32 litre unit be installed in homes with a spa bath* or large bath in order to manage the larger volume of hot water required to fill the baths.

What is the distance to the bathroom and other hot water outlets in the home?

It is most efficient to have the hot water system installed in a location closer to the outlets used most frequently such as the shower or kitchen. This helps to reduce the time it takes for the hot water to reach the outlets.

Other Accessories

When installing an Electronic Highflow system in your new home, accessories to consider include a fully enclosed recess box or a pipe cover.

Bosch Electronic Highflow 26e

The Bosch Electronic Highflow 26e unit is compact, space-saving and easy to install. It delivers 26 L/min at a 25°C rise, has a 5.53 energy efficiency rating, is suitable for 2-3-bathroom homes and is available in Natural or LP Gas.

Here are the unit’s features:

  • 53-star energy efficiency
  • Continuous flow technology
  • Delivers 26 L/min at a 25°C temperature rise
  • Compact design
  • Install up to 4 optional temperature controllers
  • Suitable for 2-3-bathroom homes
  • 55°C model standard
  • Anti-frost included on all models
  • External installation only
  • Solar compatible without the need for a solar transfer valve
  • Available in Natural or LP Gas
  • Comprehensive warranties

The unit comes with a Domestic Warranty with 3 Years of Parts and Labour and 10 Years of Heat Exchanger (part only).

Bosch Electronic Highflow 21e

The Bosch Electronic Highflow 21e Continuous Flow Hot Water Heater is compact, space-saving and easy to install. It delivers 21 L/min at a 25°C rise, has a 5.56 energy efficiency rating, is suitable for 1-2-bathroom homes and is available in Natural or LP Gas.

Here are the unit’s features:

  • 56-star energy efficiency
  • Continuous flow technology
  • Delivers 21 L/min at a 25°C temperature rise
  • Compact design
  • Install up to 4 optional temperature controllers
  • Suitable for 1-2-bathroom homes
  • 55°C model standard
  • Antifrost included with all models
  • External installation only
  • Solar compatible without the need for a solar transfer valve
  • Available in Natural or LP Gas
  • Comprehensive warranties

The unit comes with a Domestic Warranty with 3 Years of Parts and Labour and 10 Years of Heat Exchanger (part only).

Bosch Electronic Highflow Features

Bosch Electronic Highflow units are compact, space-saving and easy to install. This range is specifically designed for maximum energy efficiency and environmental protection, providing a minimum of 5.5+ star performance rating.

With a Bosch Highflow you are assured continuous hot water, while saving money and caring for the environment. Highflow systems are available in 17, 21 and 26 litre per minute flow rates and are available in Natural or LP gas.

Other Bosch Electronic Highflow Features and Benefits:

  • No need to mix hot and cold water. Simply select the temperature you desire and turn on the hot water tap.
  • Main controller can be set to the maximum temperature of the unit.
  • Bathroom controller and Sub controller have a maximum temperature of 50°C for safety.
  • Volume setting – user can specify the output of water in litres.
  • Assistance Call button allows the user to signal other household members via an audible alarm.
  • Water Saver / Bath Fill function – an audible alarm will sound, and water flow will stop when the predefined volume is reached.
  • Bosch controllers come with a comprehensive 3 years parts and labour warranty.

For generations, Bosch has been dedicated to providing quality products that protect the environment and conserve resources. We’ve got your every need in our minds as we design our products. We only want the best for you, our customers, so you can rest easy in the assurance that we deliver the best quality products to cater to your needs.

 

5 Successful Northshore (Rodney) Hot Water Cylinder Installations

If you live on the North Shore, contact us today for the best available deals North of Auckland.

Unbeatable prices and service! We will beat any quote you have.

Hot Water Cylinders NZ have completed over 50 hot water installations North of Auckland in the last 3 months.

Here our top 5 favourite picks:

#1 Gas hot water installation in Sunnynook:

Here a classic gas hot water installation in Sunnynook North Shore.

System Spec:

  • Remove old low pressure hot water cylinder and replace with Gas.
  • Rheem 27 LPG
  • Test pressure and commission. 

#2 Gas hot water installation in Takapuna:

Replace Vulcan Freeloader with Rheem Stellar

Takapuna North Shore area.

System Spec:

  • Remove old leaking Vulcan Freeloader and replace with new Rheem Stellar.
  • Maintain existing gas connections.
  • Rearrange plumbing to suit
  • Rheem 27 LPG
  • Test pressure and commission.

#3 Gas Rinnai Infinity installation in Birkdale:

Replace Vulcan Freeloader with Rinnai Infinity

Birkdale North Shore area.

System Spec:

  • Remove old leaking Vulcan Freelaoder and replace with new Rinnai Infinity.
  • Maintain existing gas connections.
  • Rearrange plumbing to suit
  • Rinnai Infinity 27 Natural Gas
  • Test pressure and commission.

#4 Low Pressure Upgrade in Glenfield:

Replace Low Pressure with Rheem Main Pressure Stainless Steel

Glenfield North Shore area.

System Spec:

  • Remove old leaking low pressure hot water cylinder and replace with new mains pressure.
  • Maintain existing plumbing connections.
  • Rearrange plumbing to suit.
  • Rheem mains pressure 180L 3KW electric
  • Test pressure and commission.

#5 Mains pressure gas continuous flow Bosch unit in Albany:

Replace old burst Rheem hot water cylinder with new continuous flow unit.

Albany North Shore area.

System Spec:

  • Remove old burst low pressure hot water cylinder and replace with new mains instant hot water flow unit.
  • Relocate existing plumbing connections to exterior.
  • Rearrange plumbing to suit.
  • Bosch Hydroflow 16L/min
  • Test pressure and commission.

Hot Water Cylinders NZ are the originals and specialists in hot water. Contact us today for your unbeatable quote.

 

Flexible Sacrificial Anodes: The Future of Water Heating Technology

Would you spend 449 including GST to increase your hot water cylinders lifespan by 10 years?

Of course! 

Imagine living in a place filled with a light cool breeze during the day, and freezing temperatures during the night. Turning on the faucets and having warm or hot water for baths, showers, washing, and whatnots is a complete comfort – the epitome and pinnacle of rest and relaxation.

In New Zealand, this isn’t an uncommon occurrence. For a country far from the sun’s rays on the equator New Zealand is definitely a cool place, abundant of rainfall and glaciers. Temperatures in New Zealand go from 10 degrees centigrade down south, and 16 degrees centigrade up north. Throughout the year, temperatures change ever so slightly!

A specific type of tank-type water heater is the Hot Water Cylinder, that uses supply water pressure and delivers hot water to showers and taps. As this type of system does not use a cold-water storage tank, it is designed for small spaces and sometimes limited access. Hot Water Cylinders are enclosed with safety mechanisms that include relief valves, thermostats, and somtimes expansion vessels.

Why You Need A Sacrificial Anode

The problem with this type of heating system is that it does not last very long at the constant pressure and heat changes it faces. That is where a sacrificial anode comes to place. This replaceable component helps maintain and control the rate of corrosion there is in the tank and is present in every water heating system. Sacrificial anodes are often made out of magnesium and attracts all corrosive elements to prevent metal breakdown.

In the span of 10 years, these anodes become very corrosive and will degrade, contributing to the damage of the heating system itself. What many people don’t know is that this anode can easily be replaced, expanding its life to over 20 years, and getting the bang out of your buck.

It should be noted that only steel hot water storage needs a sacrificial anode. It becomes a secondary type of protection to the steel in any hot water tank. Because anode rods are created using less sturdy metals than steel, the node fends off attack from minerals and other materials in your water. This is why anodes are called sacrificial.

Another thing that many people don’t know is that sacrificial anodes must be replaced every 5 years to get over 20 years of use from the hot water cylinder! The real problem now is replacing the anode in a really small, tight, and cramped place such as the hot water cupboard. Replacing this over 1 meter long component needs wide space and it should not be removed or disconnected in the cylinder, which is terribly a huge cost.

Why Use the Flexible Sacrificial Anode?

This is where the Flexible Sacrificial Anode comes into light! This type of sacrificial anode eliminates several other challenges when it comes to replacing the anode. There will no longer be a need to drain and remove the cylinders, and you will no longer have to put a hole above your ceiling for access!

This anode needs less than 250 millimeters of clearance and is very time efficient as it can be installed in an hour. Upgrading your sacrificial anode to a flexible sacrificial anode is the best choice to make, because expanding the life span if your hot water cylinder outweighs the costs of buying a new one every few years.

Where to Buy Flexible Sacrificial Anodes

Buying flexible hot water cylinder sacrificial anodes are no longer a hassle in the country. Companies like Rheem, a New Zealand staple since 1958, sell products that are at the leading edge of hot water heating technology that benefits not only residential areas, but also the commercialized areas of the country.

Hot Water Cylinders NZ invests in innovation and technology to improve your experience with hot water systems here in New Zealand. Our latest innovation allows you to replace your existing Anode without having to dismantle your whole water cylinder installation. Becuase conventional Rods are very long it is almost impossible to replace without disconnecting the entire cylinder and its pipework enabling this physically.  A flexible anode makes this possible and avoids these costs. Without much hassle our technicians will remove the degraded Rod and easily replace is with a flexible model keeping the hot water cylinder in its place which provides the same protection at a much lower installation cost.

Learn more about how to upgrade your sacrificial anode when replacing a hot water cylinder here.

Is Your Hot Water Cylinder Leaking? Here are 7 Possible Causes

Leaks are never planned and when they happen, the timing is always bad!

This guide will help you identify where the leak may be coming from and what could have caused your hot water cylinder leak.

Whether you use Hot Water Cylinders NZ to do the repair or not, by asking the right questions and/or providing the right information, you will save hundreds if not thousands in repairs or replacement depending on system type and size.

Cause #1: Damage Caused by External Forces

External damage may cause a leak within the hot water system. If your hot water cylinder is relatively new (7 years or less) then the probability of a leak resulting from wear and tear is low.

Some questions you may want to ask yourself are:

  • Have any works taken place on my property? This includes any renovation works etc.
  • Have I repaired or replaced a plumbing fixture? This includes minor upgrades such as replacing a tap to larger upgrades such as replacing a shower. Often such upgrades can result in leaks to your hot water system. Our specialists will quickly be able to investigate through a process of elimination to determine the cause.
  • Has local Council done any upgrades? Watercare can often upgrade public watermains introducing more pressure onto a private property. This added pressure may spring a leak within the hot water system.
  • Is your hot water cupboard often used for storage or drying laundry? It may well be that pipework has been knocked resulting in a loose connection. If this is the case, please don’t attempt to repair this yourself. You may risk the pressure blowing the fitting off which will become very difficult to isolate and will cause flooding.

The good news is that most hot water cylinder leaks can be repaired, keeping your cost low. Time is often of the essence.  If you quickly identify or suspect one of the above external forces to be the likely cause, please let us know at time of booking.

Cause #2: Recent Electrical Repairs or Element Replacement

When the immersion element is damaged due to age, electrical failure or otherwise, an electrician or Limited Electrical License holder such as a plumber will need to replace the element and/or the thermostat.

When this occurs you need to be aware of several things:

  1. Your tank has been under pressure for a long time. This pressure has been consistent but when the element is replaced the tank will “decompress” which results in the movement of all components internally, including the welded seem. Often, cylinders that have had no issues prior to this decompression will start to leak once the cylinder undergoes repressurisation. This expansion and contraction is more than enough to crack a welded seam under certain circumstances.

    We always advise consumers to think carefully about an investment that could require a full replacement a few months later. Often it’s better to make this investment into a new hot water cylinder system than into a repair that represents a third of the total cost. View our “*Is Your Hot Water Cylinder Leaking?” section for more info.

  2. Once the element is replaced, if you find a leak in the vicinity of the element, then the element seals have not been installed properly or could be faulty. This information comes in handy if you recently had your element replaced and have spotted a leak.

  3. Always make sure that your contactor replaces the element with an equal wattage e.g 2kW should be replaced with 2kW and not the more common 3 kW. 3kW elements are cheaper to purchase and corners could be cut which may end up costing you more.  A higher kW rating means more load on your existing wiring and HWC which again due to age may fail.

Cause #3: Safety Valves May Be Operating

We have some great information about cold water expansion valves. Here are a couple of resources:

Cause #4: Vacuum Relief Valves or Open Vents may be Overflowing

If you possess a Low Pressure Hot Water Cylinder then your installation will either include a vacuum relief valve or an open vent.

Cause #5: Age of Your Hot Water Cylinder

If your hot water cylinder is ageing and has sprung a leak, our recommendation is that you save any money you intended to spend on an investigation or repair. Having completed over 5,000 installations to date, our records show that 2 out of 10 repaired hot water cylinders end up being replaced within 3 months of the repair. This of course will depend on the fault, cylinder & environment, but in most cases a plumbing company will charge a fee to investigate and/or attempt a repair if you’re agreeable. It’s best to make sure that you will not be charged before they despatch a technician.  

TAKE NOTE: To attempt to repair a cylinder of this age including replacement of the element may result in unintended additional damage. Element threads are often seized and too much force will crack the internal tank. Low pressure hot water cylinders are often made of copper which is a relatively soft material. It will not take much force to cause a leak.

Cause #6: Watercare & Council Watermain Upgrades

If road works are visible from your home, then there is a high chance your home is affected. Particularly if you notice a leak during or after these works are complete and you didn’t have the necessary protection in place such as a pressure reducing or limiting valve which regulates your incoming pressure.

An increase of pressure may result in:

  • Safety valves suddenly discharging water
  • Open vents overflowing
  • Burst hot water cylinders

To add to the strain, often debris will find its way into households causing other issues such as hot water fluctuation or blockages on valves such as toilet inlet vales and hot water system valves.  If you intend to install a pressure reducing valve, it is highly recommended you also install a strainer which will isolate any unintended debris from entering your home.

 

If you would like more information about Watercare compensation for watermain leaks and processes, please visit the following article: Watermain Leaking? Here is What You Can Do.

Cause #7: Dissimilar Metals & A Failed Sacrificial Anode

Every steel hot water cylinder contains a specialised Hot Water Cylinder Sacrificial Anode. Over time they break down so your hot water cylinder doesn’t. But what happens when are fully broken down? What will protect your hot water cylinder?

Whilst this is one of the causes a cylinder may leak, you may ask your, “well isn’t it a bit late once my cylinder is leaking?” You are absolutely right! This information won’t help if your cylinder is leaking but it will provide you with some knowledge around why it may be and what you can do to prevent it from happening again.

For other faults such as electrical faults or no hot water at all, please visit the following resources:

The above is a short list of causes that apply more than others. We also come across dozens of isolated causes which we have not included due to their rarity.

If you are unsure what may have caused a fault on your hot water cylinder, why not give us a quick call and speak to our highly qualified hot water cylinder specialists?

In many cases we can identify the fault over the phone at no cost to you. Alternatively, in 80% of all cases, we are able to identify the fault over the phone and immediately advise of repair and/or replacement costs. Hot Water Cylinders are New Zealand’s #1 hot water specialists and are ready to assist 24/7.

HUNSON RT AKA “THE ELEPHANT”

Hunson_brandManufactured in Glen Innes Auckland on January 1978 by W. Hunt & Son Ltd this HUNSON RT revolutionized mains pressure water heating in New Zealand!

Due to high manufacturing costs and technology limitations, in the 1970’s hot water cylinders were primarily manufactured from copper.                                                         hunson_RT

Copper hot cylinders are made to suit low to medium pressures (75KPA – 120KPA), with medium pressure cylinders being made from thicker copper. The week spot on a cylinder is not the actual copper material but rather the machine manufactured welding seams. Anything above 120KPA depending on weld quality and the seam will crack resulting in a burst hot water cylinder!

So how do you get around this problem and achieve mains pressure using low pressure technology? W. Hunt & Son Ltd certainly acknowledged the demand for mains pressure and their reply was the advanced Hunson RT Direct mains pressure hot water system. Great engineering and ahead of its time.

What makes the Hunson RT so special?

hunson_diagram

 

The basic principal was to use the heat exchanger to supply mains pressure ONLY to one shower making it a semi “instantaneous water heater” (in the 70’s showers started becoming more popular) whilst using the large low pressure body of water to supply the exchange heat to the mains pressure coil and direct supply to all other low pressure fixtures such as a bath or laundry.

On request Hunson could manufacture these cylinders with multiple elements up to a total of 8KW! This would certainly make the supply more reliable and showers longer but expensive to run (not sure about power rates VS income in the 70’s). Modern cylinders use the same technology in reverse because water can now be stored in a mains pressure environment (stainless steel or enamel) and of course also because of a few other reasons such as efficiency and reliability.

What challenges did this “new style” mains pressure cylinder present to home owners?

hunson_rt_instructions

 

 

To start with, it was important the plumber got the installation right. If you have a look at the image you will see the instruction says: “At all times, the flow from the cylinder should be strong and steady, but not excessive”. Mains pressure can be anywhere from 120KPA to 500KPA and the term “not excessive” is too broad. If the pressure was set too high the heat exchanger would not have enough time to keep up with the demand. Plumbers also started using the mains pressure supply (which was originally only intended for one shower) to deliver mains pressure to the whole house and all plumbing fixtures! This immediately presented a problem because the standard supplied element of 3KW could not keep up with the demand and showering usually was over after 5 minutes! This was also the case with Hunson RT you see in this image. the only reason this cylinder survived over 30 years was because the hot water from the low pressure supply side was never used. The sludge build-up on the inside would reach all the way up to the element. Despite a sludge relief point which was most likely never ever used.

Another common issue this technology presented was random cold patches during a warm shower. Have a look at the diagram and see whether you can identify expansion, cold water inlet, hot water supply, overflow and sludge outlet. This date_230178cylinder also provides bottom entry connections for wetbacks.

Why did this hot water cylinder receive the nickname “The Elephant”? 

It turns out there used to be an engineering company in New Zealand call Elephant NZ. Elephant NZ originally came with this technology and design which was purchased by W. Hunt & Son Ltd. Why that actually engineering company was called Elephant, we don’t know but if you do, please send me an email so we can add this info to our article.

Internal natural gas hot water cylinders

Iinternal_gas_hwcinternal gas hot water cylinders are always a bit harder to replace because of existing installation conditions. Gas hot water cylinders installed 10 + years ago may not comply to the latest standards. this includes ventilation, flue penetrations, floor base, seismic restraint and several other factors. New products such as the internal Rheem 170L are much more efficient and carry 5 year warranty. What do our installers look for before installing one these models?

  • Ensure the platform is fire resistant (e.g. concrete paver will do it)
  • Ensure there will be sufficient ventilation at lower level and down draft diverter to allow for complete and safe combustion.
  • Check to make sure the existing gas supply pipe is of sufficient size.

    On completion our technicians are required to do a full gas pressure inspection to confirm there are no existing or new gas leaks. Once the installation is complete seismic restraints will attached to secure your new hot water cylinder and finally a gas certificate can be issued that your new hot water cylinder is deemed safe and sound. Hot water cylinder NZ offer various gas hot water solution’s including instant water heating and combination central heating. For more information please call us on 0800 4 Cylinders.

What are Calorifiers?

A calorifier is a heat exchanger which heats water indirectly by circulating is over a heating coil or multiple coils. The source of heat can be water or steam, heated by an external heat source, contained within a pipe immersed in the water. the two bodies of water or steam do not mix. (touch each other)

In hospitals and factories where steam is already being generated for other uses is can also be used to heat the water by the indirect method.

The calorifier may be a continuous coil of pipe or a cylinder within a cylinder with an annular space between the two vessels.

calorifier_design

With the vertical hot water cylinder, the steam enters the coil though the top connection. the strainer or grit trap removes any solid matter suspended in the steam. The steam then passes through the inlet valve which is thermostatically controlled. the thermostat prevents overheating or boiling of the stored water.

A steam trap, fitted near the outlet of the coil, prevents the steam from leaving the coil until is condenses.

In a hot water cylinder which contains a steam coil, the coil must be able to be removed for descaling. this is more likely to occur using steam because the coil is working at a higher temperature than with the conventional hot water system.

Hot water cylinders Ltd provide custom hot water cylinder (storage tanks) design and construction with integrated calorifiers at most demanded KW sizes. Our services include domestic and commercial applications. With water applications heat sources such as Heatpumps, Gas, Solar or steam can be applied. For more information please contact us on 0800 4 CYLINDERS.

Heatpump hot water cylinder conversion

heat_pump_hpt_water_cylinderIf your looking at saving power ($$$) with your domestic hot water heating demand, your hot water cylinder is leaking or you are keen on upgrading to mains pressure why not consider a heat pump hot water cylinder?

Save up to a third on your hot water bill with this Aquarian Heatpump! These heatpump cylinders can be installed internally as well as externally with the difference that the air intake must be ducted to the outside if the installation is to take place inside. This is usually achieved by ducting directly up through your existing hot water cylinder cupboard and out through the roof. Our installation special includes a flashing fro your roof, all ducting (up to 5 meters), all involved labor and materials for $ 4999 including GST . If your a high hot water user or want a quick return on your investment now is the time to place your order! For more technical info on this heat pump hot water cylinder please CLICK HERE

Please note that electrical services are not included and an obligation free site visit must be made by us prior to our commitment.

For alternative heat pump specials please visit our heat pump catagory section.