Cor van de Water wrote:
So a tankless heatpump water heater would be the ultimate
Jay Summet wrote:
Yes, but you would need an enormous pump, and exterior condenser unit (and a serious electrical service to handle the startup load) to be able to provide the 24-27kw of heating power needed for a 3-8 GPM usage. This would be a unit larger than a standard house AC unit.
It would also not be "instant" heat. It takes time for a compressor to start and build up pressure, and for it to heat up the "hot" side enough to make useful hot water.
An electric heater or gas fired flash boiler is probably the best solution for a sink heater. Save the bigger, slower, but more efficient solutions for big jobs, like filling a bathtub.
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