> A regular water heater needs about 12kWh a day, For reference: I’m in a household of three. Over the last month (winter, when n case that matters) we average

> A regular water heater needs about 12kWh a day, For reference: I’m in a household of three. Over the last month (winter, when n case that matters) we averaged 7.9kwh per day. I recently did the maths on switching to a heat pump hot water cylinder and the payback was surprisingly long at 5-7 years.