| Re: [GMCnet] Just another on-demand water heater [message #185917] |
Sat, 29 September 2012 14:56  |
KB
Messages: 1262
Registered: September 2009
Karma:
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Senior Member |
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I've noticed that all the pics of this heater install always show
the heater and ducts, but nobody ever talks about the water line hook-ups.
We ran into an interesting problem on our recent install:
if you just naively tap into the "hot" and "cold" lines under the sink,
you create a parallel hot water circuit. If the route through the regular
water heater has less drag than through the demand heater, you end up
with little to no flow through the new heater. In our case, it was such
low flow the demand heater wouldn't even kick on. Oops. I think even
if you get enough flow to trigger the demand heater, you could maybe
still end up with some strange dynamics.
The choices we've figured are either use the old water heater output
as the "cold" inlet to the demand heater (ie, plumb it in series),
or put a valve on the old heater to shut off flow through it
when you want to use the demand heater.
Just curious if others have run into this issue, or if we were just
particularly dumb or unlucky in our initial install.
thanks
Karen
1973 23'
1975 26'
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Karen
1975 26'
San Jose, CA
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