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Best Hot Water System: Best Gas Hot Water System, Best Instant Hot Water System | Reviews & Prices

What is the best gas hot water heater system? The best hot water system has the right combination of good reviews, ratings, size, price, the type of system, the brand and the specific model that fits your needs. The best hot water system is going to be different for different people, depending on their situation.

It may be the  best electric hot water system (best electric hot water heater), best gas hot water system, best instant hot water system (best instantaneous hot water system), best heat pump hot water, best continuous hot water system or best gas instantaneous hot water system, as long as it meets your needs.

When you compare instant hot water systems, the best instant hot water system (best instantaneous hot water system) is the instant gas hot water system from Rinnai. It provides instantaneous hot water that is reliable, efficient and best value for money.

Concerned that what your plumber recommends may not be what is the best hot water system (best hot water heater) for you or your home? 

What size hot water service do I need?

What is the best hot water system price?

We review and compare the best hot water system types and prices, comparing the pros and cons of the various alternatives, to help you make an informed decision.

Best Electric Hot Water System

Best hot water system

The best electric hot water system (best electric hot water heater) also has the right combination of good reviews, ratings, size, price, the type of system, the brand and the specific model that fits your needs. The best electric hot water system (best electric hot water heater) could be the best heat pump hot water, the best instant hot water system, the best instant hot water or the best electric hot water tank.

Best Gas Hot Water System

The best gas hot water system is arguably the best selling Rinnai Infinity 26, which is the best gas instantaneous hot water system (best instant hot water system) and may also be the best hot water system overall. The Rinnai Infinity 26 is a high quality, reliable, energy efficient unit which is good value for money at a competitive Rinnai infinity 26 price.

The best gas instantaneous hot water system (best instant hot water system) is probably the best gas hot water heater system and the best instantaneous hot water system, as gas instantaneous is better than electric.  The best instantaneous hot water system is synonymous with the best continuous hot water system. The best natural gas water heater would be the same as the best LPG system, the best selling Rinnai Infinity 26 natural gas water heater.

Gas vs Electric Hot Water

When you compare best hot water systems and gas vs electric hot water, some say it's the best gas hot water system and others say it's the best electric hot water system.

The best hot water system (gas or electric hot water) has the right combination of good reviews, ratings, size, price, the type of system, the best gas hot water heater brands and the specific model you need.

Comparing hot water systems, like the best electric hot water system (best electric hot water heater) vs the best gas hot water system is obviously a subjective judgement, but that will be true of anyone trying to compare and name the best of anything.

Given that hot water often consumes around 25% of a home’s energy budget, you really want what is the best hot water system for you or your home.

These decisions will affect the upfront cost of purchase and installation and the ongoing running costs.

Best Gas Hot Water Heater Brands - Best Electric Hot Water Heater Brands

Rinnai is the best gas hot water heater brand for instantaneous gas hot water heaters, with the top selling 6 Star Rinnai Infinity 26. Rheem is the best gas hot water heater brand for gas hot water heater tanks, with 5 Star Rheem Stellar gas hot water heaters.

The best gas hot water heater brands have the right combination of good reviews, ratings, size, price, the type of system, and the specific model that fits your needs.

Many people that compare hot water systems believe that gas instantaneous hot water systems are the best gas hot water system choices. The best gas instantaneous hot water system brands are now available in 7 Star units. The best instant hot water system brands include Rinnai and Rheem.

Solar hot water system boosters can be electric, natural gas or LPG.  Arguably, the best solar hot water system is gas boosted. Solar hot water system option may take a number of days to install and are very expensive compared to the alternatives.

Most Efficient Gas Hot Water Heater

A 6 or 7 star rated energy efficient gas hot water heater is the most efficient gas hot water heater and the best instantaneous hot water system. These efficient gas hot water heaters are condensing models with two heat exchangers, one for the burner and another extracting heat from the exhaust gases. With electricity costs rising, gas remains the fuel of choice for hot water heater efficiency.

A 7 star LPG gas hot water system is your best choice for the most energy efficient gas hot water heater, with both natural gas and electricity prices rising. High efficiency gas hot water system are one of the most inexpensive types of water heaters to operate, when it comes time for a hot water system replacement.

Best Natural Gas Water Heater

The best natural gas water heater would be the same as for best LPG gas hot water systems. Compare hot water systems and the best natural gas water heater generally has all of the same performance, features, quality, warranty and price as the corresponding best LPG gas hot water systems. It would be the natural gas version of the best instantaneous hot water system.

So the best natural gas instant water heater and the best natural gas water heater tank would be the same brand and model in best LPG gas hot water systems. The best instant natural gas water heater brands would still include Rinnai and Rheem. The best natural gas water heater tank is the Rheem Stellar.

Compare Hot Water Systems: Best Electric Hot Water System -  Best Electric Hot Water Heater

When you compare hot water systems, the best electric hot water system (best electric hot water heater) is probably from Rinnai, Rheem or Dux. The Rheem best seller, the Stellar hot water heater range with sizes between 50L and 315L and using stainless steel construction, would be Rheem's best electric hot water heater system, with good reviews and tthe best ratings.

Compare What is the Best Hot Water System Type

Compare best hot water system (best hot water heater) types including best electric hot water system, best solar hot water system, best gas hot water system, best heat pump hot water, best tank hot water heaters and the best gas instantaneous hot water system whilst the best gas hot water system brands include Rinnai, Dux, Rheem, Bosch and others. 

Even the best heat pump hot water can be very noisy and struggle in really cold weather.

The best gas instantaneous hot water system would also be the best continuous hot water systems.

Compare What is the Best Hot Water System Prices

A 6 or 7 star rated energy efficient gas hot water heater is the most efficient gas hot water heater. These efficient gas hot water heaters are condensing models with two heat exchangers, one for the burner and another extracting heat from the exhaust gases. They provide the lowest prices for operating costs.

Combining this low operating cost with the best prices and you have the lowest lifetime cost.

Compare hot water systems to find the best price gas water heater brand including the best Rinnai instant hot water system, Bosch hot water, the best Rheem gas water heater, Dux hot water system and AquaMAX hot water.

Click on your category of interest to compare best hot water system prices (best hot water heater prices) :

Best Gas Instant Hot Water System Prices

Best Price on Hot Water Tanks

Best Price Solar Hot Water System

Hot Water Service – A Review of Your Choices

Compare Best Electric Hot Water System Tanks

Electric Storage Hot Water Systems

The best electric hot water system (best electric hot water heater) tanks or cylinders have been the most common hot water system in Australia for decades. 

Unfortunately, with the rising cost of electricity and the high greenhouse gas emissions associated with generating the required electricity, these units are falling out of favour.
In fact, the government has passed legislation to try and limit their use.
Electric water heaters that heat all day are your most expensive option.  
Off peak electric storage units are better, as off peak electricity tariffs are lower.
However, 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.
Still, many people with an old electric unit are tempted to replace like-for-like and continue using an electric storage unit. 
It is a quick, one day fix and the upfront costs are not prohibitive.  However, the long term disadvantages need to be considered.

Compare Best Hot Water System Review - Best Tank Hot Water Heaters

Gas Storage Hot Water Systems

A gas hot water systems review would involve a comparison between the best tank hot water heaters and the the best gas instantaneous hot water system.  

The installed cost of a gas hot water tank is close to that of the electric hot water systems, especially if you already have gas at your home. 

A gas hot water tank appears similar compared to an electric hot water tanks for sale, the primary difference is that the electric heat element is replaced with a gas burner.

Gas hot water tank are energy efficient, particularly if you choose one of the new 4 or 5-Star models, and they have much lower greenhouse gas emissions.  Compare that with the best gas instantaneous hot water system now available in 7 Star units.

Also, there are no time-of-day tariff issues with gas. Even the best electric hot water system may be subject to time-of-day tariffs.

This means that gas hot water tank do not need to be as large, as the gas burner can operate whenever required.

You can also choose a gas hot water tank no matter where you live, as they are available in both natural gas and LPG models.  

Installation is normally accomplished within one day.

Gas Boosted Solar Hot Water

 gas boosted solar hot water system

Gas boosted solar hot water can have some of the lowest running costs and greenhouse gas emissions, but they are typically the most expensive to install, with installed cost as much as 4X that of a storage unit, even with rebates. Gas boosted solar hot water are equipped with a booster unit for periods without sufficient sunlight. 

Solar hot water system boosters can be electric, natural gas or LPG gas boosted solar hot water system  

It is important that you purchase gas boosted solar hot water with a sufficient number of panels and tank storage, so that the booster is not overused, or the running costs will be higher.  

Your roof configuration also needs to be compatible with gas boosted solar hot water. 

The gas boosted solar hot water option may take a number of days to install.

Compare Heat Pump Hot Water

Hot Water Heat Pumps

Heat pump hot water heats your water by extracting heat from the ambient outside air, in the same way that a reverse cycle air conditioner would heat a room.  Some say heat pump hot water are the best electric hot water system.

The heat pump hot water is kept in a tank, similar to storage systems.  

Heat pump hot water can be quite efficient and have low greenhouse gas emissions but, once again, the upfront costs are substantial.

Heat pump hot water also have a couple of weaknesses that have caused them to lose popularity in the last few years.  
Because they essentially incorporate an air conditioning unit, there are many more moving parts and the maintenance costs tend to be higher than for any of the alternatives.
They also have the dubious distinction of requiring as many as 3 trades for repairs: an air conditioning mechanic, a plumber and an electrician.
The other issue is noise.  
If you live in close proximity to your neighbours or if you like to leave your windows open, the compressor and fan noise can be problematic. 
This is especially true if the unit is set-up to run off-peak.  
It can easily need to run all night because of the colder ambient temperatures after dark.

Heat pump hot water can be very noisy.

Best Gas Instantaneous Hot Water System - Best Gas Instant Hot Water System

Gas Hot Water Systems Review - Tankless Continuous Flow

The best gas instantaneous hot water system would also be the best continuous hot water system . A gas instant hot water system is also arguably the best gas hot water heater and the best hot water system. Gas instantaneous hot water systems are up to 7 star money saving energy efficiency, compact, aesthetically pleasing, no issues with Legionnaires' disease, and best of all they have a coninuous flow of hot water that never runs out.

This all makes the best gas instantaneous hot water system the best hot water system.

Tankless gas instantaneous hot water systems are better as they provide hot water on demand whenever you turn on the tap, as you need it.

These units only heat the water as it passes through so there is no storage tank.  

This also means you never run out of hot water. 

While the running costs are not quite as low as solar and heat pump units, the upfront costs are much lower with the best gas instant hot water system.

Greenhouse gas emissions are also much lower than electric storage.

Available in both natural gas and LPG versions, these units are very energy efficient, with 6-Star or better ratings for the best gas instantaneous hot water system (best gas instant hot water system).

Best Continuous Hot Water System - Best Instant Hot Water

The best continuous hot water system continues to be the Rinnai Infinity series of continuous hot water systems. The Rinnai Infinity 26 is the best selling continuous system. The Rinnai B26 builder series continuous hot water system is also great value for money, with the same specs as the Infinity 26 but for less money.

The best continuous hot water system (best instant hot water) is better because you only need to heat the water to 50°C. This is because the prevention of bacterial growth is NOT an issue with tankless units, as it is with all of the other alternatives that have tanks. Continuous hot water systems also never run out of hot water as they are literally "continuous".

Rinnai makes the best continuous hot water systems (best instant hot water) with their Infinity range and the Rinnai Infinity 26 is the best instant hot water seller in the marketplace. Continuous hot water systems come in LPG and natural gas models.

Compare Best Electric Instant Water Heater

The best electric instant water heater are also available. However, they are not very common.

As they are used during the day, you pay the full electricity tariff, as opposed to off-peak electric storage units.

This higher cost of operation is the main reason for the rarity of instantaneous electric hot water systems.

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

Combustion Efficiency & Star Ratings

When it comes to energy efficiency, many believe that 6-7 Star tankless gas continuous flow instantaneous hot water systems are the best hot water system (best continuous hot water system), especially based on the affordable initial investment.

Star ratings encapsulate both a start-up heat up factor for each appliance and combustion efficiency.

As a result, combustion efficiency for each star rating can vary a bit.

However, if we look at combustion efficiency in isolation, it does make it a bit easier to understand what it all means.

The following are all approximate but will give you a good idea what to expect based on what star rating you choose:

4 Star = 73%

5 Star = 80%

6 Star = 87%

7 Star = 94%

Size and Aesthetics

Bosch 26e

At about the size of a small suitcase, tankless gas continuous flow instantaneous hot water systems are the best looking, as they are much smaller than a traditional storage tank heater. Mounted flush against the wall, the smaller tankless gas continuous flow instantaneous hot water systems are better, as they take up less space and are also more aesthetically pleasing, as they don’t dominate the exterior appearance of your home.

Storage tank hot water heaters are big, especially the electric off-peak models. 

Even when installed outdoors, the size can get in the way, particularly with today’s smaller lot sizes. 

Having this large object next to your house also does nothing for the appearance of your home.

So, when considering size and aesthetics, once again tankless gas continuous flow instantaneous hot water systems are the the best continuous hot water system and the best hot water system.

Health & Safety

Storage tank hot water heaterWith storage tank water heaters, there is the potential for bacteria growth within the tank. 

The World Health Organisation -- WHO -- recommends that stored hot water be kept at a minimum of 60°C. 

Unless a minimum of 60°C is maintained, hot water tanks can be a breeding ground for Legionnaires’ disease, or Legionellosis, that is caused by a bacterium, Legionella pneumophila. 

It is a respiratory disease that can cause severe pneumonia and is sometimes fatal.

However, Canadian studies have shown, even when the thermostat is set at 60°C, a high percentage -- approximately 40% -- of electric water heaters remain contaminated. 

This is because of the lower temperature, of about 30°C to 40°C, at the bottom of the tank.

A tankless gas continuous flow instantaneous hot water systems is best at the prevention of bacterial growth, as there is no stored water in which bacteria can breed. 

Tankless gas continuous flow instantaneous hot water systems can also be better set at 50ºC, so the risk of scalding is greatly reduced without the need of a tempering valve.

What Size Hot Water System Do I Need?

Don't Calculate 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 Really 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?

Showers Are the Key - Water Saving Shower Head

Showers use the most hot water in a home. People generally shower for 5 to 10 minutes. Assuming you have a 3 Star water saving 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, water saving shower head 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 water saving shower head is an important factor in saving water and energy whilst reducing the size and cost of the hot water system required.

Hot Water Tank ExampleRinnai HOTFLO 170 gas hot water system

In the above example with water saving shower head, 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 Issues

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 Hot Water Example

Bosch 21e tankless gas hot water systemFor 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. 

Tankless gas continuous flow instantaneous hot water systems are the best, as recovery time is not an issue with continuous flow units, so even a large family with guests would not run out of hot water.

 

Gas Hot Water Special Offers

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Bosch 17e, 21e & 26e Gas Hot Water Systems

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The information in this article is derived from various sources and is believed to be correct at the time of publication. However, the information may not be error free and may not be applicable in all circumstances.