How do I choose the right hot water system for my house?

1 September 2016

By far the most efficient way to heat hot water in your home is with natural gas, so the first thing you need to consider is whether you can connect to gas and in particular natural gas.  Rinnai is the pioneer behind the introduction of continuous flow hot water in the NZ market over 40 years ago, however we also provide a range of electric hot water systems since a small number of NZ home owners don’t have access to gas.


Gas hot water systems can save you up to 50%* on your running costs when compared to electric hot water cylinders.  Rinnai’s INFINITY® range of gas water heaters only heat the hot water when you need it and provide peace of mind that the hot water won’t run out! It’s a nifty little system which is able to be installed outside so you won’t have to sacrifice any of your indoor living space. The gas hot water systems can be run on both natural gas and LPG bottles.


Rinnai’s range of electric cylinders are made of stainless steel, enamel or copper. These come in both mains pressure, low-med pressure and low pressure options.  Mains pressure is the preferred option as you can have multiple taps and showers running hot water at once without the flow dropping significantly. Low pressure systems are common in older homes and typically it will take a long time to run a bath.


How do I choose the right size gas hot water system?

Once you have decided you have gas, you need to decide what sized unit you need.

The Rinnai INFINITY® gas hot water comes in the following three ranges:

  • Rinnai INFINITY® VT – designed for homes requiring endless hot water with a lower initial cost.   Save 50% with natural gas when compared to electric.  Sizes available that deliver between 16 litres and 26 litres of hot water per minute.
  • Rinnai INFINITY® HD – designed for applications that need higher flow rates or have larger water use requirements and can be used domestically or commercially.   Save 61% with natural gas when compared to electric.  Sizes available that deliver between 26 litres and 32 litres of hot water per minute.
  • Rinnai INFINITY® EF – designed for the environmentally conscious who want to significantly reduce running costs and lower energy usage whilst still having the luxury of endless hot water.  Save 66% with natural gas when compared to electric.  Sizes available that will deliver between 24 litres and 32 litres of hot water per minute.

To determine the right sized gas hot water unit for your home, complete the following steps.



How do I choose the right size electric cylinder?

Rinnai offer a range of different cylinders. These can be broken down into the following:

  • Stainless steel mains pressure – designed for durability, the quality of these is outstanding and come with a 20-year warranty.  For added efficiency and to save more on your running costs, you can upgrade to solar, heat pump or wetback.

 

  • Enamel mains pressure – designed to adapt to your installation needs these cylinders are available as indoor or outdoor models. There is also an under-sink model which is popular when the kitchen is a long way from the other hot water outlets in your house.

  • Stainless steel low-med pressure – designed to last. They can operate up to medium pressure giving you a better shower without having to upgrade to mains pressure. Built from duplex stainless steel, this range offers a 10 year warranty.  For added efficiency and to save more on your running costs, solar and wetback options are available.

 

  • Cooper low pressure - designed for those wanting an economical solution. These are the lowest cost cylinders and therefore ideal if you want a like for like replacement. The cylinder also comes in under-sink models, popular when the kitchen is a long way from the other hot water outlets in your house.

  • Hotflo outdoor mains pressure – designed to be placed outside your home to free up space for a new spacious kitchen, larger laundry or that extra storage cupboard you’ve been dreaming off.

To determine the right sized cylinder for your home, refer to the following table:


PEOPLE

CYLINDER SIZE

Up  to 3

135 L

4

180 L

5

215 L

6

250 L / 270 L

7

300 / 340 L


VT models save up to 50% on your running costs when compared to electric hot water*.

1 Comment

sam stewart • 4 months ago

hi,

I am getting a gas rinnnai vt 20 installed to run hot water to dish washer, kitchen sink, washing machine, washing basin, shower, sink and bath. would this be suffice? also am installing gas hobs. would this effect the uptake of gas from the bottles at all?
your advice is much appreciated,

cheers,

sam
  • Write a comment

  • Name:
  • Email:
  • Comment: