How many litres does my water heater need?

A water heater is sized by peak flow. Pick the outlets running at the same time and the winter mains temperature; the page returns the litres per minute you need, the size to buy and the gas meter that supports it.

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Gas Water Heater Size CalculatorPick the outlets in use, the shower head and the winter inlet temperature to see the peak hot water demand in litres per minute, the heater size that covers it, and the gas meter it needs.