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Re: [GMCnet] Water Heater Pop-Off [message #273329 is a reply to message #273323] Sun, 08 March 2015 19:10 Go to previous messageGo to previous message
cbryan   United States
Messages: 451
Registered: May 2012
Location: Ennis, Texas
Karma:
Senior Member
This is starting to look to me like the best plan. If one added the accumulator Ken uses, that should take care of all usual expansion due to water heating. If there were any actual steam (from the sudden drop in pressure when turning on a faucet (that seems possible in the extreme case, at altitude), I think it might be taken care of slowly by the very nearby thermostatic mixing valve. By that I mean, presumably the steam resulting would certainly not be in any part of the piping downstream (toward the shower and faucets) of the water heater, and it would be let in so slowly by the thermostatic mixing valve that it would condense far before it reached a faucet. (On thin ice here.) If you have grandkids, etc, every water outlet in the coach would be protected from scalding. You could then moderate from say, 115 degrees down with adding cold water as desired. Have there been any reports at all of boiling in the engine coolant water heaters? We should have them by now that the system has shaken down pretty well, in 40 or so years.

Adding a thermostatic mixing valve close to the water heater, would there be issues with winterizing? More drain valves added?

One final note, you could then safely keep the hot water heater above 140 degrees to kill Legionnaires' Disease gram-negative bacilli, which can thrive in warm to hot water. Note in motorhomes, even the cold water will be elevated in temperature. That takes care of the hot, but the cold, depend on recent fills and clean water tanks, from what I have gathered on the internet. I wish we had a more definitive protocol. Maybe a little chlorine bleach in the cold water would not be a bad idea. Further info from Wikipedia says that the bugs for Legionnaire's multiply in 77 to 113 degree F water and like 95 degrees water the best, but they need a food source for rapid multiplication. There are other related diseases, all better understood after 1976, when 34 delegates to an American Legion Convention died in Philadelphia due to warm conditions in an air conditioning cooling tower. Not much of a chance for any of this, please ignore if this offends. I don't mean to.

Carey

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

[Updated on: Sun, 08 March 2015 19:23]

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