Posted on

What Is The Best Hot Water Cylinder in New Zealand?

We get many phone calls and emails with people asking, “What is the best hot water cylinder”?

The quick answer is, there is no quick answer.

This blog could end up being thousands of pages long

In principle, this answer is not brand driven but rather situation driven.

These situations consist of

  • Residential applications
  • Commercial applications
  • Efficiency applications
  • How many people are in your household?

 

Let’s explain.

 

Residential applications

If you only have two people in your household, sure you can get a “standard” 180L hot water cylinder. But this would be wasteful as you would never truly use all the hot water that cylinder provides and beyond that, you will be spending a lot more on energy costs heating up more hot water that you won’t use!

You would be much better off with a gas instantaneous unit instead, this unit is designed to only heat hot water when you use it. Because you only have 2 showers a day and run the kitchen and bathroom occassionally, you will only use gas when you need it.

These units as you can imagine are ideal for holiday homes. You visit the Bach a couple times a year, normally when you arrive you’ve  got to wait a couple hours for the water to heat up. With an instantaneous unit, just hook up the gas bottle and turn on the electrical switch. Instant hot water straight away.


A 3–4-person household:

If you have 3-4 people in your household, your standard size hot water cylinder of 180 litres such as a Rheem 180 would be your ideal solution as you would use most of the hot water of that cylinder and you wouldn’t be heating water that you don’t use.

 

However, if you have 5 or more people in your household, you’ll need more hot water. A gas hot water cylinder such as a Rheem Stellar would be most beneficial for your situation for energy consumption. Gas has the power to produce a great amount of energy in a short amount of time. Instead of 160 litres that the cylinder holds, it produces 300 litres in the first hour.

 

Commercial applications

 

Commercial properties undeniably require a lot of hot water and for this, you need a stronger unit. A Rinnai HD250 is designed for higher hot water demand such as hotels, nail salons and restaurants. These units are excellent for producing great amounts of hot water for busy business application and again, it only uses hot water when you need it.

Efficiency applications

 

There are options to get more efficiency out of hot water. There’s solar options which harness the power from the sun to heat up your hot water – at no cost.

You can get cylinder blankets that are wrapped around the cylinder to keep in as much heat within the cylinder as possible.

Insulating the hot water pipework is also an option to efficiently keep more heat from escaping away into the atmosphere. Much like the cylinder blanket, it’s wrapped around the pipework and acts the same way like a heat barrier.

Posted on

Rinnai Infinity A Series PCB Board Installation

The video will show the step by step procedure of installing the Rinnai Infinity A Series PCB Board. Please be guided accordingly

  • Keeping the packaging up to the side make sure you keep the manual so you can give it to the client later on and place the unit on flat surface where you can work comfortably.
  • Use a Philips screw driver and remove 4 screws holding the front panel on. There is one on each corner.
  • Unpack the PCB board, be careful with it because it’s electronic, you’ll see that there are 5 ports that we will be connecting. They are all in a different shape.
  • Find 5 different wires on the unit that you will be connecting and notice that there is a pin at the bottom of the board that locks the PCB into the unit itself.
  • Find the correct set of wire and plug them into the corresponding ports on the control board. You can’t really get this wrong because they will only fit one way as they are all different shapes. If they don’t fit, DON’T force them and try another.
  • Now carefully drop the PCB into place and push the pin into the unit itself. You’ll see that it will lock it by going through the galvanized steel at the bottom of the device.
  • There is one more screw that you need to put on to keep the board secure inside the unit. You can ee that here. Use an appropriate tool so as to avoid hitting any cables or scratch the PCB.
  • Put the front board back on and put all 4 screws back in place with your driver. Be careful don’t over tighten Once you completed these, you’re pretty much good install the unit. Job complete.

Please make sure that once you have installed the unit you strictly follow the manufacturer’s commissioning instructions. Only attempt this PCB installation if you are qualified and competent to do so. Hot Water Cylinders NZ do not take any responsibility for following instructions within this video.

Posted on

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.