I'd like a inline mains pressure electric water heater for my kitchen. However, I want to run it off the hot supply. The line to the heat bank in the loft is around 20m, much of it in 22mm, so it takes an age for hot water to come through. I'd just like to electrically heat until the hot water comes through. I don't want to run a pumped return line for energy efficiency reasons.
When the hot comes through, I want a thermostat in the heater to cut the power. Is there such a device available cheaply?
3kW should be enough (less if storage). I only want to wash my hands or rinse something. If I'm filling the sink, I can wait for the proper heated water to come through. I suppose it could be a storage unit or instantaneous, provided it can feed a standard mixer tap at mains pressure.Christian.