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Registered
Join Date: Apr 2014
Location: Gulf Coast Texas
Posts: 2,420
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I installed a small one in a 20 shipping container that I converted to a "Guest Cabin" at the old family home place. It is only used for the shower and the bathroom sink. It uses a 240 volt 30 amp service. A shower can be a very unusual experience. Things are counter intuitive. Depending on the flow rate, the temperature car vary all over the place. The well pump delivers water pressure between 20 and 40 PSI. At the highest pressure right after the pump shuts off water temperature drops because more water is being pushed through and heater. At the lowest pressure before the pump starts up again, that water gets real hot. Also with the tap wide open it is coolest and with the tap hardly on it it very hot. With a low flow shower head, if the cold water tap is turned up, it causes back pressure on the water heater causing it kick out and stop heating. I fixed that real quick by taking the flow restricter out of the shower head. My latest installation is a propane fired tankless and I like it a lot better.
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