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In article .com,
says...

# Fred # wrote:
And I guess a UPS that would supply power for more than 1/2
hour or so is going to be costly. So's a generator.

Dan

Should be cheap as not much power required to control the gas fired unit. Go
to any office or computer store and get one suitable for you unit - should
be under $100. You need to replace the UPS battery once every few years.

ahh check the current use of the tankless, if it uses a fan for exhaust
you may need a really large UPS.

My Takagi draws less than an amp maximum, and that's briefly while the
blower is clearing the exhaust after the burner shuts off; most of the
time it's much lower draw. Any decent UPS can handle 120W loads.

--
is Joshua Putnam
http://www.phred.org/~josh/
Braze your own bicycle frames. See
http://www.phred.org/~josh/build/build.html