On 07/27/2018 12:25 PM, Lee Hart via EV wrote:
Good catch. :-) I was assuming gas; not electric. I've never seen a big tankless electric water heater, for exactly the reason mentioned (too high a peak load). Tankless electric water heaters are usually little under-the-sink units, to provide hot water for a cup of tea or to wash your hands.
Wandering farther off topic.... I have a seldom used guest house with a propane tank heater. Several years ago, I put in a cheap chinese propane demand heater in parallel. That cc heater worked well enough. Except that it threatened to burn the place down. I now have, in stock, an electric demand heater which I intend to install when the fancy strike me. It will replace the cc propane heater so that I can use the propane tank heater as back up in case the demand heater does not give acceptable temperature rise. This is a situation where only about 2gpm of hot water is needed, either in the shower or the kitchen sink; not both at the same time. I don't recall the power rating but I did decide it would pull about 20 amps and I intend to install it with about 5' of 10 ga wire. When I get around to it, I can report the results.
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