Quote:
Originally Posted by HKS PWR
A battery backup used for home computers is more than enough to keep a tankless hot water heater going for hours.
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A) Only for gas fired units
B) So another piece of equipment to maintain and spend money on, UPS batteries need to be replaced every few years.
So much higher initial cost, plus ongoing maintenance costs, to basically avoid the inconvenience of "using up all the hot water" and gain maybe a slight efficiency increase.
Maybe it's worth it for some people, not for me.