Solar heater: how many litres does your home need?
“How many litres?” is the most-asked question — the answer depends on your home. Here’s the principle, and get your starting capacity from the calculator.
The right capacity (litres) for a solar water heater depends on your household size, number of bathrooms, and simultaneous use — not one number for everyone. So anyone quoting “X litres fits Y people” as a fixed figure is oversimplifying something that varies home to home. The principle is simple: the more people, bathrooms and usage, the more litres you need so everyone gets hot water without running out.
Why isn’t there a fixed number?
Because two homes with the same number of people can differ: one has one bathroom, the other two; one showers all together in the morning, the other throughout the day. All of that changes the capacity needed. So we work it out for your home, not from a general rule.
What sets the litres
- People: the base — more use means more litres.
- Bathrooms + simultaneity: two bathrooms together need bigger storage than one.
- Usage: daily showers + kitchen + washing machine raise the need.
- Season/weather: winter usage rises a little.
Exact figures (how many litres precisely) ⚠️[PROOF: capacity in litres — from the approved catalogue, not published as a number before approval]. That’s why we point you to the calculator, which produces a starting capacity from your inputs.
So how do I find my home’s capacity?
In a minute: answer three questions in the calculator (home type + bathrooms + people) and get the right starting capacity. That’s far more accurate than a general number online, because it’s worked out for your home. And the inspection confirms it. (Wider view in How to choose the right heater?.)
Find your right capacity ← then Book a free inspection to confirm it on-site.
Frequently asked questions
- How many litres does a solar heater need for a family?
- It depends on people, bathrooms and simultaneous use — not a fixed number. The calculator gives your home’s starting capacity in a minute.
- More people means more litres?
- Yes — usage rises with people and bathrooms, so capacity grows with them.
- Is the calculator’s number final?
- It’s an accurate starting point; the free inspection confirms it based on your roof and actual usage.
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