| Re: [GMCnet] Just another on-demand water heater [message #185917] |
Sat, 29 September 2012 14:56  |
KB
Messages: 1262
Registered: September 2009
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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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| Re: [GMCnet] Just another on-demand water heater [message #185923 is a reply to message #185917] |
Sat, 29 September 2012 17:01  |
zhagrieb
Messages: 676
Registered: August 2009
Location: Portland Oregon
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Senior Member |
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I plumbed mine in parallel with shutoff valves on both. That gives me the option to use either. The on demand, however, has shown itself to be one of the best mods I've made. Glenn
Glenn Giere, Portland OR, K7GAG
'73 "Moby the Motorhome" 26'
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| Re: [GMCnet] Just another on-demand water heater [message #185970 is a reply to message #185917] |
Sun, 30 September 2012 08:11 |
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JShot
Messages: 485
Registered: October 2006
Location: NW Ohio
Karma: 0
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Senior Member |
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| KB wrote on Sat, 29 September 2012 15:56 |
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....
Just curious if others have run into this issue, or if we were just
particularly dumb or unlucky in our initial install.
thanks
Karen
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Karen,
No, you were not dumb, just maybe unlucky - your layout is different.
One of the 'good' things about a Royale Center Kitchen is that the old water heater is/was under the bunk bed right next to the reefer dividing wall. It was an easy chore to just push the hot and cold water lines back under the false floor that the reefer sits on, and drill a hole in that floor, and pull the lines up to right under the new propane heater. The lines hooked right up to the new heater without any other adapters. An easy install 
John
John Shotwell
Ridgeville Corners, OH
78 Royale Center Kitchen
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