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Re: Water Heater Pop-Off [message #273195 is a reply to message #273140] Fri, 06 March 2015 12:10 Go to previous messageGo to previous message
cbryan   United States
Messages: 451
Registered: May 2012
Location: Ennis, Texas
Karma:
Senior Member
Quoting your last message, George,

"This does help. I have a '74 (square model). The valve may not be new, but perhaps it is still temp and pressure. If so, I may go back to the 180*. I know there is supposed to be a reducer in the output at the head, but I am afraid that when going cross country even a slower flow will get the water "too" hot."

Thinking about how hot is "too" hot. I wonder if just replacing the Pressure Temperature valve on your rectangular water heater with just a pressure valve and depending on not boiling the water there using your radiator to keep below an estimated say, 220 degrees F at the engine, wouldn't hurt you. And if it did boil, it would vent on the pressure valve as designed. You might have to be extra careful at altitude. At 9500 feet at Telluride, Colorado, the boiling point of water is 195.5 degrees F. The electric setup there on your water heater has a limit switch on it for the electric side, as well as a thermostat. Then, you would have an in effect, an unscientifically estimated slightly (8%) larger water heater and one that would keep water hotter for a little longer if that means anything to you. I know Johnny Bridges would appreciate both, as he washes dogs while boondocking in dog show parking lots.

There is a scalding issue with both the engine coolant-heated water heaters at the washroom and shower. I would rather spend money on a thermostatically controlled mixing valve than on the other paraphernalia. There is also a cheap solution where a pair of Tee connections near the shower head between hot and cold with a restriction automatically kept the hot water from scalding. However, at the last dregs of heat from the water heater when boondocking, that mixing would still occur unless manually shut off, which would mean we forget the next time and scald anyway.

I know Dan Gregg went to the 195 thermostat in winter for increased front heater performance and changed out to 180 in summer, just what he did. I plan to go with 195 if we travel much in winter. JWIT.

Carey

Carey from Ennis, Texas 78 Royale, 500 Cadillac, Rance Baxter EFI.

[Updated on: Fri, 06 March 2015 12:20]

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