(We) Recently used the 3kW heater for 2 weeks (in a caravan) and have nothing but praise for the unit. As long as you are not expecting high flow there is instant hot water available at any time.

We installed a Rezi 4 under the ensuite sink a year ago and now enjoy instant hot water. Previously we had to wait quite a while for the hot water to reach that part of the house, wasting many precious litres.

I have had a tiny Rezi 5 installed under the kitchen sink for several years, trouble free. Prior to this I squandered 11 litres of water every time I turned on the tap before hot water reached the sink. The Rezi is saving heaps of water, my valuable time, all with incredible efficiency. My power bill has taken a dive.