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If you are considering an electric hot water system, do you want a small or large tank?

Smaller tanks (25-160 Litre capacity) tend to run on “continuous power electricity”.

Larger tanks (250-400 Litre capacity) tend to run on “off peak 1” or “off peak 2” power. Off-peak 1 is turned on from 11 PM and 7 AM approximately. Whereas “off peak 2” is turned on between 11 PM-7 AM and has an additional boost from approximately 1 PM-4 PM.

When looking into electric ones, one must consider that off-peak 2 is slightly more expensive.

This type of electric hot water system is expensive to run. My professional opinion is to avoid this fuel source at all costs. However, in some circumstances, this is unable to be done. Also, it is not so good for the environment. I recommend considering solar or heat pumps if continuous electricity is the only available fuel source.

Gas storage systems are expensive to run. My professional opinion is to avoid this fuel source at all costs. However, in some circumstances, this is unable to be done. Also, it is not so good for the environment. I recommend considering solar or heat pumps instead of gas hot water systems if continuous electricity is the only available fuel source.

These electric hot water systems have poor flow rates and are expensive to run. I would normally suggest electric instantaneous water heaters unless you already have an existing one. In these cases, I usually recommend the Stiebel Eltron DHF 15 for Sydney customers, which delivers 4.5 litres per minute.

A continuous flow system is efficient and have 5-6 star gas efficiency. Additionally, gas continuous flow, or instantaneous, have reasonably good flow rates. Though for larger houses, I normally suggest a product that has 5 star gas efficiency. Keep in mind these systems have a lot of components. Unfortunately this means there are more things that can go wrong, making it very difficult to fix if they break down.

They range in capacity size from 12 -32 litres. The 26 litre capacity size are the most common gas hot water systems on the market. The size is measured by the amount of hot water that can be delivered in one minute at a 25 degree rise.

Heat pumps are basically an air conditioner that heats hot water. By being designed this way, it saves about ⅔ of the energy used to heat up the hot water. This benefit of decreased energy consumption is reflected in the price of heat pumps. Heat pump water heaters will generally cost upwards of $3,000. Tank sizes range from 160-315 litres in capacity.

Solar hot water systems are available in Hiline (tank on roof) or Loline (tank on ground), with tank sizes range from 150-400 litres in capacity.

Using solar hot water energy consumption can be reduced by up to 65-90%, depending on hot water usage. Usually, I recommend the Rheem Hiline Stainless Steel system due to the longevity of the tank and minimal working parts. Keep in mind for stainless steel, it is a more durable product so you see that in the price tag. So a Rheem Hiline Stainless Steel 300L 2 panel will cost upwards of $4,000.