How to choose the right solar water heater
A practical guide to choosing a solar heater: the four things that decide the right choice, and how to get your home’s capacity in a minute.
Choosing the right solar water heater comes down to four things: your household size, the number of bathrooms, your roof’s space and orientation, and how you use hot water. There’s no “one size fits all” — the heater that suits a couple in a flat is different from one for a villa with three bathrooms. This article walks you through it step by step so you choose right.
Thing 1: household size
The more people in the home, the higher the daily hot-water use, so you need a bigger capacity (more litres). This is the most important factor. A small family’s needs are completely different from a large one or a home with frequent guests. The exact numbers depend on your home — find your right capacity in a minute.
Thing 2: bathrooms and simultaneous use
It’s not just the number of people — it’s how many bathrooms run at the same time. A home where two bathrooms are used together in the morning needs enough capacity for both without the water going cold. That’s why we ask about bathrooms, not just people.
Thing 3: the roof — space and orientation
A solar heater needs a spot on the roof that gets sun. A roof that sees the sun for longer performs better, especially in winter. If the roof is small, crowded, or shaded, that affects the choice — and that’s what the free inspection settles on-site.
Thing 4: how you use it
How do you use hot water — daily showers, kitchen, washing machine? Heavy, simultaneous use needs bigger capacity and storage. Light use needs less. This completes the right choice.
So how do I choose exactly?
No need to memorise formulas — the calculator does it all. Answer three questions (home type + bathrooms + people) and get the right starting capacity for your home, then the inspection confirms it and checks your roof. (Capacity details in How many litres does your home need?, and flat vs villa in Solar heater for a flat or a villa?.)
Find your right capacity ← or Book a free inspection and we’ll choose the right one after seeing your home.
Frequently asked questions
- How do I choose the right solar heater?
- Based on four things: people, bathrooms, roof space/orientation, and how you use hot water. The calculator gives a starting capacity and the inspection confirms it.
- What’s the most important factor?
- Household size and simultaneous use (how many bathrooms at once) — they set the base capacity.
- Do I need to know the capacity before the inspection?
- The calculator gives you a starting capacity in a minute; the inspection confirms it on-site.
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