On July 26, 2018 10:57:17 PM EDT, Cor van de Water via EV <[email protected]>
wrote:
>Jay,
>So a tankless heatpump water heater would be the ultimate: no massive amount of
>electrical load (less than a dryer) to make instant hot water, so also
>no
>loss from storing hot water?
>Cor.
>
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.
You would probably still need a 100 amp service for startup, even if the
average draw would be 25 unless we used some fancy slow start electronics.
Another problem is that heat pumps take a bit of time to get up to pressure so
you would probably end up using resistant elements for the first 30 seconds of
draw anyways (again needing the100+ amp service) so it would only really be
using the heat pump efficiencies for longer periods of usage such as for
showers.
All in all, a well insulated tank of hot water is not a bad energy storage
device if you're going to use the energy as hot water.
Jay
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