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Gas hot water heater systems. Great prices…

LPG Gas Hot Water Heater Systems
Helping to keep you in hot water... 

Gas Hot Water Systems - LPG & Natural Gas

Get gas hot water systems with tankless continuous flow hot water and great gas hot water system prices.

Whether it's the best selling Rinnai LPG Gas Infinity 26 gas water heater or the quality Bosch LPG gas hot water range of gas water heaters,  Elgas has the right tankless LPG gas hot water system for your home. 

Go to online gas appliance store

 LPG and Natural Gas models available

Tankless Continuous Flow LPG Gas Hot Water Heater Systems

Never run out of hot water again!

Rinnai Infinity Gas Hot Water SystemsTankless continuous flow LPG gas hot water heater systems provide hot water on demand whenever you turn on the tap and you save energy, too.

These units only heat the water as it passes through:

Hot water on demand with continuous flow LPG gas hot water heaters

You'll never run out of hot water...even when extra guests drop in

You save money- these gas water heaters only heat the water you need

Optional controllers enable temperature control and auto bath fill

Continuous flow gas hot water systems are wall mounted and compact

Optional temperature control of your gas hot water in different rooms

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See gas hot water prices and purchase online 

How a Tankless Water Heater Works

Schematic of continuous flow hot water heaterIn summary:

• Cold water flows into the water heater when a hot water tap is opened inside your home.

• The water flow is detected by a sensor that ignites the gas burner, to heat the water in the heat exchanger.

• The water typically follows a serpentine pattern through the heat exchanger, absorbing as much heat as possible.

• An electronic control unit modulates the gas burner to maintain a set water temperature.

See all the details on:

How a Tankless Hot Water Heater Works


Compare Gas Hot Water Heater System Prices

Now you can compare prices for all the major brands of gas hot water systems including Rinnai, Bosch, Kelvinator, Rheem, Dux and AquaMAX.

Click on your category of interest to compare prices:

Tankless Instantaneous Continuous Flow Gas Hot Water Systems Prices

Gas Storage Tank Hot Water Systems Prices

Gas Boosted Solar Hot Water Systems Prices


What Size Hot Water System Do I Need?

You can save a substantial amount of money by not buying a hot water system that is larger than you really need. 

You may save on the initial cost plus the ongoing running cost.

Get it Right and Save Money

When it’s time to get a new hot water system, one of the key questions relates to the sizing or capacity of the unit. 

Hot water accounts for about 25% of the average home energy costs, so it’s important to get this right.

Calculating by Number of People or Bathrooms?

The sizing information available is very confusing because manufacturers, and others, are trying to provide a simplified answer to a complicated question. 

Some suggest that you calculate by the number of bathrooms in your home while others say to go by the number of people in your family. 

Also, in many cases, their recommendations are based on the worst case scenarios, assuming higher consumption than your actual water use.

Buying Too Large Wastes Money

The result is that many people end up buying a larger system than they actually need. 

This costs them extra money when they buy the hot water system and will increase the ongoing operating costs, in many instances.

Factors to Consider

Simultaneous use is one of the fundamental determining factors.  

The number of people in your home combined with how and when they use hot water is the key. 

  • Do they all take showers at the same general time of day? 

  • Do they take showers simultaneously in different bathrooms?

  • Do the showers have WELS 3 Star Rated Showerheads (maximum 9L/Min) or standard 18 to 25L/Min showerheads?

  • Do some prefer baths, which use more hot water? Is the bath or spa oversized, requiring even more hot water?

  • Do you run the washing machine, using hot or warm water, while people are showering?

  •  Is your dishwasher connected to the cold or hot water? If hot, do you use it while hot water is being used elsewhere?

Please also see:

How to Switch to LPG Hot Water for Your Home

Star Ratings for Gas Hot Water Heater Systems

How Long Do 45kg Gas Bottles Last 

Showers Are the Key

Showers use the most hot water in a home.  People generally shower for 5 to 10 minutes. 

Assuming you have a 3 Star shower head and you mix in some cold water with the hot, the typical hot water consumption would probably be in the 7 litres per minute range. 

If you also assume an 8 minute shower, you will consume about 56 litres of hot water per shower or a family of four would consume 224 litres. 

The use of WELS (Water Efficiency Labelling and Standards) 3 star rated showerheads is an important factor in saving water and energy whilst reducing the size and cost of the hot water system required.

Storage Hot Water TanksRinnai HOTFLO 170 gas hot water system

In the above example, if all four people take their showers in the morning, you would only need a storage hot water system with 224 litre first hour capacity, regardless of how many take showers at exactly the same time.  

This all presumes that you are not using any other hot water devices at the time.  

The use of additional hot water, after the shower period, would depend on the hot water system’s recovery time required to achieve full temperature.  

So, with a larger family or house guests, a bit of scheduling may be required to avoid the need for a larger unit.

Off Peak Electric

Off peak electric storage units are a completely different story. 

Inasmuch as they only heat water at night, they need to be quite large to make sure you don’t run out of water during the day. 

So, some of the electric savings is offset by the fact that you need to heat a larger tank. 

The bigger tank would also cost more to purchase.

Tankless Continuous Flow Hot Water Systems

Bosch OptiFlow 26For a tankless continuous flow unit, it would depend on how many showers are being used simultaneously. 

Using the example above, if it’s two showers, then you only need a unit with a minimum flow rate of 14L/min. 

If you have 3 people showering at exactly the same time, you would need a minimum 21L/min.  

This does assume that you are not using other hot water devices simultaneously. 

Recovery time is not an issue with continuous flow units, so even a large family with guests would not run out of hot water.


In summary, the size of hot water system you need primarily depends upon on your family’s peak usage period and when you use additional hot water, as opposed to the number of bathrooms or people. 

Taking the time to consider your actual usage, before buying, can save you energy and money.



If you are switching from electric to LPG hot water, please see:

 Find a local plumber or gas fitter


Rinnai Infinity Gas Hot Water System Deluxe Bathroom Controller



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