Category Archives: Hot Water Talk

hot_water_cylinders_for_sale

We Have Hot Water Cylinders for Sale!

Gas heaters can be found in many homes in Auckland. These heating systems often use hot water cylinders to ensure copious amounts of hot water are stored and available on demand. There are a number of things to consider when choosing a hot water cylinder for your home, i.e. capacity, efficiency, cost effectiveness and suitability to your boiler system.

Types of Hot Water Cylindershot_water_cylinders_for_sale

There are two main types of cylinders:

  • Unvented Cylinders. These work off the cold water main pressure, providing hot water on demand. Since they operate without a feeder tank, unvented cylinders free up space in your loft and allows you to install the cylinder anywhere around your home.

Generally constructed with top quality stainless steel, unvented cylinders have long lifespan and high durability with manufacturer’s warranty that range up to 25 years.

Since they operate at higher pressure than traditional vented units, unvented systems require additional safety features and need to be installed by boiler specialists. This adds up to the installation costs.

  • Vented Cylinders. These copper tanks are fed cold water from the mains feed and use gravity to drive water through the pipes to the home’s heating system. They are suitable for use with standard heat only boilers. A vent pipe connects the cylinder and the cold water in the header tank.

Vented hot water cylinders are less complicated than vented systems, which means they are easier to install and maintain.

Other types of hot water cylinders come in both vented and unvented systems:

internal_gas_hwc_for_saleDirect Systems

In direct systems, an internal element (usually an immersion heater) heats the water in the cylinder directly. The heated water is fed out the top of the cylinder and supplied to the outlet (i.e. a shower or a tap) on demand.

Direct cylinders are an electric only option and are normally used when no central heating is installed, such as in flats and apartments.

Indirect Systems

As the name suggests, indirect cylinder systems heat water indirectly via an external heat source such as a gas boiler or solar thermal. An immersion heater is typically fitted as a direct backup or supplementary heat source. This ensures you have a steady flow of hot water even when your boiler is broken.

Indirect gas heaters particularly heat up and recover faster, making them a cost effective option. If you want to save cash without compromising performance or efficiency, you can always switch to gas cylinders any time.

We offer Best Price Guarantee!

Just as not all hot water cylinders are created equal, not all varieties are priced the same. Think your quote is cheap? Try Us!

We carry a wide selection of hot water cylinders from leading brands including:

  • Bosch
  • Rheem
  • Econergy
  • HJ Cooper
  • Rinnai
  • Peter Cocks
  • Apex Valves
  • Chromagen
  • Green Glo
  • Triumph
  • Thermann
  • And more

For hot water cylinder repairs, upgrades or replacements, call our free NZ hotline: 0800 429 546.

We Want A Hot Water Hero!

HWC ad 2We know the right guy is out there!
If your passion is hot water then Hot Water Cylinders NZ need you!Your responsibilities will include:

  • 60% Hot water cylinder installations
  • 20% Hot water gas units
  • 10% Solar Heating (servicing and fault finding)
  • 10% Heat pumps and Boilers

You Job position will include:

  • Vehicle, phone, fuel card and uniform
  • Industry Specialised Tools Provided
  • Training in systems

Every job will have a KPI and if accomplished you will be rewarded above and beyond your epic hourly pay. We have a unique package waiting for the right candidate. If hot water is your super power, apply now! Please submit your CV to cv@hotwatercylinders.nz

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Hot water cylinder repairs in Auckland

Checkout some of our latest hot water cylinder repairs in Auckland!

We pride ourselves with over 1500 Hot water cylinder repairs in 2017. Hot Water Cylinders NZ is your #1 water heater specialist in repairs and replacements. If you have a fault, talk to us.

Repaired faulty cold water expansion valve.

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New Pipework due to leaks

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Resealing of incoming connections

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Installation of new Rheem Stellar

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Replacement of fault change over regulator

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Repair of exiting Rheem Instant water heater

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Repair of gas leak

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Replacing existing low pressure hot water cylinder limiting valve

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Temporary hot water cylinder installation to accommodate renovations

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Inlet valve and pipe repair

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Replacing therm couple on gas hot water cylinder

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Gas valve repairs on Rheem Stellar

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What Is Ripple Control?

Have you ever looked at your hot water cylinder only to find that it was not operating? Upon inspection, you find that there is nothing wrong with it. So why is it not running?what_is_ripple_control

What you are seeing is the result of a type of power load management, know as ripple control. Load management is used to allow utilities to reduce electricity demand during peak usage times. This is a cheaper and more reliable alternative to using peaking power plants, of which some can take more than an hour to bring online, which makes load management even more critical if a plant goes offline unexpectedly.

Ripple control is the most common form of load management, and is used in many countries worldwide. It works by superimposing a high frequency signal, usually between 100 and 1600Hz onto the standard 50-60 Hz main power signal. When devices which are attached to the non-essential loads receive this signal, they shut off the load until the signal is disabled. Affects devices can include residential electric hot-water heaters, air conditioners, pool pumps and crop-irrigation pumps. This includes your hot water cylinder.

ripple_control_hot_water_cylinderWhen connected to a power network that runs load control, devices are outfitted with communicating controllers that run a program that limits the duty cycle of the device. Consumers are usually rewarded for adhering in the load control program by paying a reduced rate for energy in off-peak times. Controllers are available for ripple control which will ensure your devices run during off-peak times and you will save money by paying a lower tariff.

To find out more about ripple control for your water heater, talk to us today. If you are not on ripple control and you don’t have hot water, check out our “No Hot Water Troubleshooting Page” to diagnose the problem.

Hot_water_cylinder_faults_no_hot_water

Your Cylinder May Just Need A Repair, Not A Replacement

Your cylinder may just need a repair, not a replacement.
Does your hot water cylinder suffer from one of the following conditions?

  • No Hot WaterHot_water_cylinder_fault_repairs
  • Very Low Temperature
  • Knocking (Banging) Noises
  • Hot Water Smells
  • Low Pressure
  • Leaking Hot Water Cylinder
  • Damaged Hot Water Cylinder
  • Discharge Valves Running Constantly

First things first, DON’T PANIC!

Your hot water cylinder may be repairable.

Hot Water Cylinders NZ provide unique repair options for most hot water cylinder related faults. Before jumping into an expensive replacement, get the professionals in to investigate and repair the problem at a fraction of the cost.Fault_hot_water_cylinder_element

Hot Water Cylinder Faults and Remedies

NO HOT WATER (Temperature)

Possible Faults: Faulty thermostat, faulty element, blown fuse, power provider ripple control.

Possible Remedies:  Replace thermostat, replace element, replace fuse, unsubscribe, ripple control.

Hot_water_cylinder_faults_no_hot_waterNO HOT WATER (Physically)

Possible Faults: Blocked tempering valve, blocked strainer, incoming water problem, various possible blockages, damaged valve.

Possible Remedies: Process of elimination, identify fault and repair.

VERY LOW TEMPERATURE (or High/Low Fluctuation)Blocked_tempering_valve

Possible Faults: if applicable, incorrect controller or thermostat settings, damaged element, damaged or wrongly set tempering valve, damaged diffuser, possible blockages, tapware problem.

Possible Remedies: Change thermostat and/or controller, tempering valve settings. Process of elimination, identify fault and repair.

KNOCKING OR BANGING NOISE (Water Hammer)

water_hammerPossible Faults: This fault can appear when upgrading from low to mains pressure. Existing pipework not fixed properly, plumbing priority wrong, too much pressure, damaged valves, damaged or unsuitable tapware.

Possible Remedies: Find and fix loose pipework, improve existing priority, install water hammer arrestor. (For more information please view our “what is water hammer” blog.)

HOT WATER SMELLS BAD

Possible Faults: (External Smell) Typically an issue that relates to older cylinders or cylinders that have been slowly leaking internally (element thread or minor crack) for longer periods of time. When the insulation between the casing and tank is wet for a long period of time, it will rot and start to smell. (Internal Smell) A bad smell coming from the tap when hot water is running may be caused by the following: Bacterial growth due to minimum HWC temperatures not being met, accumulated sludge/rust caused by insufficient protection against electrolysis(?) due to the breakdown of a sacrificial anode. Incoming water affected by filthy water tanks or non-treated roof water. Note that smell is heightened by the higher water temperature.

Possible Remedies: Replace hot water cylinder, process of elimination, identify fault and repair.

LOW PRESSURE

low_water_pressure_hot_water_cylinderPossible Faults: This fault will depend on whether it’s an existing low pressure problem or whether it’s a new low pressure problem. (Existing) Existing low pressure system and no fault, damaged pressure reducing valve, incoming pressure changes, tapware, related valve issue, excessive sludge/debris blocking outlet. (New) Tapware, blockages, valves, incoming pressure.

Possible Remedies: (Existing) Replace/repair valves/tapware, remove blockages, insert booster pump, upgrade to mains pressure. (New) Replace/repair valves/tapware, remove blockages. Process of elimination, identify fault and repair.

Leaking_hot_water_cylinderLEAKING HOT WATER CYLINDER

Possible Faults: Split welded seams or welded connections caused by various reasons including thermal expansion and contraction, typically seen with older leaking hot water cylinders, loose fitting, damaged fitting/valve, overheating causing condensation, worn element washer.

Possible Remedies: Repair leak where possible, hot water cylinder replacement.

DISCHARGE VALVES RUNNING CONSTANTLY

Possible Faults: In most cases there is no fault at all. The cold water expansion valve (considered the energy valve) may discharge up to 20L/day in very hot weather and no hot water usage. The idea is to discharge cold water instead of hot water to save on power which is much more expensive than water. Faulty valve, faulty TPR, debris blocking valve spring.

Possible Remedies: Follow manufacturing instructions to manually discharge water from valve to remove debris, regularly maintain valves, repair or replace faulty valves.

In some cases a repair is not possible or recommended, especially if it’s not economical or safe to do a repair. Depending on the fault, our team is trained to make the recommendation that will assist you with your budget and requirements.

WARNING!! When older cylinders are repaired or an element is replaced, they must be drained to enable the process of repair. This draining will cool down the cylinder tank and reduce its pressure. Consequently higher expansion and contraction will take place when the cylinder is re-pressurised (refilled with water). This process may result in an already poorly welded tank seam cracking which would result in a leak. The danger is that a seam cannot be repaired and a full cylinder replacement would be required, rendering the original repair redundant.

This information may be updated regularly to accommodate new information. 

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What Is Water Hammer

Do you hear banging or knocking coming from your water system? Often times we get people reporting a banging noise coming from the water system, but there is nothing hitting any of the pipes or parts. This phenomenon is called Water Hammer. How is this caused?

Water hammer is caused when the valves are shut off, and the sudden stoppage of the water causes a sudden spike in pressure which reverberates through the pipes, causing them to rattle and shake, and produce the knocking noise. Areas that commonly have water hammer issues include:

  • Flush valveswater_hammer
  • Solenoid valves (washing machines, dishwashers and zip boiling units)
  • Ceramic disc tap ware
  • Full flow ballcocks
  • Long runs of pipe
  • Pumps
  • Worn out valves

What can you do to stop this noise? The solution to this comes by means of a device knows as a Water Hammer Arrestor. What this device does is it provides a comprehensible cushion of air in the system, so when pressure occurs the water is pushed against this air which absorbs this spike. You want this placed as close as possible to the offending valve, pipe or area where the banging is occurring. Depending on the pipework system and how extensive it is, you may need to use multiple arrestors to effectively solve this situation.

 

water_hammer_installationTypes of water hammer arrestors

Single Chamber Water Hammer Arrestor – A commonly used arrestor, these are most often used on 12mm pipe and are easily installed onto any section of pipe where it is needed. Its sealed air chamber absorbs the energy from pressure spikes in the water pipe system. These arrestors are made of copper and sustain water temperatures up to 80ºC. The benefit of these arrestors are that they can be installed at any angle to the main pipe. If a threaded joint is not available to attach the arrestor, it can be soldered into place on a T-joint and fitted into the existing pipe, taking up little space behind the wall panel.

Mini End Stop Water Hammer Arrestor – This type of water hammer arrestor is designed to be directly attached to the hose connection of a washing machine, dishwasher, or other water-using appliance. It comes with a 90-degree angled fitting and a threaded end and can be used on a range of pipes from 12mm to 25mm. They can be screwed to a threaded fitting or soldered directly into the pipe itself. While they work best installed at 90 degrees, they work at any angle. Like the single chamber arrestors, these only need minimal space behind any interior wall.

Hose Bib Style Water Hammer Arrestor – These are ideally suited to be used directly on the water intake on washing machines, as they can handle higher water volumes pressures than the other types. These have a wide PVC housing with an internal diaphragm to disperse the shock of water flowing through a quick closing valve. They are larger in diameter and therefore not suited for installation inside a wall. They also tend to be the most expensive to purchase and install.

To read more about RMC water hammer arrestors see the following:

pdfRMC – What Is A Water Hammer?

Water Hammer Faults And Remedies

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Make Sure Your Hot Water Is Hot Enough!

If you try to save power by reducing your hot water cylinder temperature, you need to be very careful. The following may also happen to you:

https://www.stuff.co.nz/national/health/96161836/water-cylinder-warning-after-nelson-bays-family-develops-rash-after-showering

legionella_bacteria_hot_water_systemsCases of Legionella have been popping up as people have fiddled with their hot water cylinders, lowering the temperature in an attempt to save on heating costs. But this can cause a serious problem.

Hot water cylinders should normally be set to a minimum 60°C. At this temperature, bacteria cannot survive, and therefore keeps your water clean. When you set the temperature lower than this, it becomes an optimal breeding ground for Legionella bacteria, which is the main concern for hot water systems in New Zealand.

Some people, however, think that by lowering the temperature that the hot water cylinder is set at, they will save power. While this can work, going below 60°C is not safe, because this is the perfect  temperature range for the bacteria to grow.

make_sure_your_hot_water_is_hot_enough

What is Legionella?
Legionella is an aquatic bacteria that lives in warm water conditions. It is the cause of Legionnaires disease and is commonly found in potable water supplies, hot tubs, cooling towers, fountains, swimming pools and so on. It breeds in warm water temperatures of 20-45°C. This is why it is recommended to keep your cylinder above 60°C, they cannot survive at these temperatures.

tempering_valveMost cylinder manufactures these days such as Rheem have a prevention lock on the thermostat which restricts people from reducing the temperature via the thermostat. In most cases, it is only possible with older models, however we have come across several systems where DIYers have dropped the temperature through various methods despite the thermostat lock by manipulating components. This results in damage and invalidation of warranties.

If you are looking for ways to save on water heating, speak to us today about upgrading to a more efficient hot water system. Don’t risk your health to save a few dollars!

 

 

 

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New Range Of Rinnai Mains Pressure Enamel Indoor/Outdoor Cylinders

Rinnai is introducing a new range of mains pressure enamel cylinders for indoor and outdoor installations. This range is the latest addition to their completely revised and improved electric hot water cylinder collection.

Rinnai_mains_pressure_enamel_cylinders

This new range will replace the current Hotflo Mains Pressure Enamel cylinders. The new cylinders feature a coloured steel outer case and are weatherproof, so outdoor fitment is an option. We have been running down our stock levels of the current Hotflo range of cylinders and will be selling the new range as stock depletes.

The new range will also replace some of the existing mains pressure enamel cylinders in the Rinnai range. This table highlights the existing and new range of cylinders:

New_rinnai_mains_pressure_enamel_cylinder_range
pdfRinnai Mains Pressure Enamel Hot Water Cylinders

Please note that the port positions and other dimensions on the new cylinders are different to the current range. This means that it won’t be a straight swap, and some work may be required to fit the new cylinder. Please be aware of this when replacing your cylinder, as it could add to the cost of the installation.

If you are looking at replacing your cylinder and not sure if the new Rinnai mains pressure hot water cylinders will be suitable for you, contact us or give us a call on 0800 429 546 and we will be happy to advise you.

hamilton_gas_water_heater_specials

Hot Water Cylinder Specials For Hamilton

Has the time come for you to upgrade or replace your hot water cylinder or water heater in your Hamilton home? We have just the deals for you!

Our recent BULK buy of Rheem units in Hamilton allows us to drop our pants! Being able to secure a special deal, we are able to pass on these savings to our customers and offer this deal today.
We will undercut any quote you have on the same units for anyone else.

Our Hamilton specials include:

hamilton_gas_water_heater_specials hamilton_gas_water_heater_upgrade_specials hamilton_hot_water_cylinder_specials

Why is it best to choose a hot water cylinder specialist? Read our guide here on why you should always use a hot water cylinder specialist to install your water heating system.

Another thing to keep in mind also is whether your quote is apples for apples. Many companies offer deals with a very slight variation, which can often include a necessary item that ads a big cost on top of the special price. When comparing deals, make sure they include the same items.

Check out our website now to see all the deals we have on at the moment and save on your new water heating system in Hamilton today! Contact our office in Hamilton on our Hamilton hot water cylinder page or simply call the following number 0800 429 546.