Forum Discussion
DrewE
May 10, 2015Explorer II
15A 120VAC is 1800 watts, which is equivalent to 6141 BTUs/hr. This means your heater can theoretically heat 6141 pounds of water 1°F each hour, or about 30 gallons by 25°F. To get a 25° rise you thus need to have a flow of about 1/2 GPM. Their claims seem rather optimistic to me. (It is reasonable to expect a tankless electric water heater to be very nearly 100% efficient at converting electrical energy into water heating.)
If you're insistent on heating the fresh water tank, I still recommend using your existing water heater and pump system rather than buying another heater/circulator unit; all it requires is a bit of plumbing to route the hot water back to the tank. It should be little more than a valve and a bit of tubing and a couple of tees, much of which you'd need to install the block heater anyhow.
If you're insistent on heating the fresh water tank, I still recommend using your existing water heater and pump system rather than buying another heater/circulator unit; all it requires is a bit of plumbing to route the hot water back to the tank. It should be little more than a valve and a bit of tubing and a couple of tees, much of which you'd need to install the block heater anyhow.
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