Solar Hot Water Calculator

Goodhew Electrical and Solar has created this solar hot water calculator page to help you choose the system best suited to you.

Use the tables below to estimate what size solar hot water system you’ll need.

There’s also a form so you can contact us directly for a quote.

Calculate what solar hot water system you’ll need

Solar hot water systems are measured in terms of their size—in litres (lt)—and their number of evacuated tubes.

The type of solar hot water system you’ll need is easy to calculate as it’s usually based on how many people are living in your house.

Use the table below to calculate what solar hot water system you will need.


Get a quote from Goodhew

Simply enter your contact details and the code shown (to tell us you’re not a robot), and click ‘Send Message’.

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Contact us

If you’re still unsure which system would be perfect for you, or if you have any questions about our solar hot water systems, please contact us.

Phone our office on (07) 3286 1422 or email us at

Alternatively, if you’re interested in seeing a demonstration of a solar hot water system, visit our Cleveland office.