Featuring Whisper technology, the only noticeable sound is that of a gentle fan swish as the cold air is drawn through the fan.

The Rheem[XML1] MPi-325 uses 65 per cent less energy than an electric water heater, reducing greenhouse gas emissions and electricity bills. It also comes with a back-up element that ensures constant 60ºC hot water, regardless of the weather.

The heat pump uses the same plumbing and electrical connections as an electric water heater, making it a suitable upgrade or replacement for a standard electric water heater.

It has a 325 litre capacity and comes with a five-year warranty.