| Re: [GMCnet] Water Heater Pop-Off [message #273329 is a reply to message #273323] |
Sun, 08 March 2015 19:10   |
cbryan
Messages: 451
Registered: May 2012
Location: Ennis, Texas
Karma: 3
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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] Report message to a moderator |
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| Re: [GMCnet] Water Heater Pop-Off [message #273331 is a reply to message #273323] |
Sun, 08 March 2015 19:44 |
powwerjon
Messages: 849
Registered: March 2013
Karma: -2
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Senior Member |
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Ken,
That would be the best way to install the valve, then all hot water outlets are protected. We bought a park-model here in Tucson and they have a19 gallon HW tank and in order to stretch the hot water time for showers we now run the tank temp at 160 and then thru a anti scald valve to keep the temp at about 110 F. Much safer, valve fails in the cold position.
I used this valve from McMaster-Carr, it is a 3/4” valve, but they offer a 1/2” that will work well. I personally am not comfortable with the made in China stuff.
The part number is 1184N2 and it is more expensive, but I would trust it more.
The McMasterCarr site is down as of now, will check later.
J.R. Wright
> On Mar 8, 2015, at 4:09 PM, Ken Henderson wrote:
>
> I want to be sure I understand the concept/plan here: Do you install the
> mixing valve at the output of the water heater so that the Hot faucets all
> receive the moderated water, with the Cold unaffected? That should, I
> presume, allow one to control the water temperature, up to the mixing valve
> setting, at any faucet.
>
> It's probably time I did something like this.
>
> Ken H.
>
>
> On Sun, Mar 8, 2015 at 5:39 PM, RC Jordan wrote:
>
>> This what you had in mind, Matt?
>>
>> Marine mixing valves
>>
>>
>> http://www.go2marine.com/product/387709F/torrid-marine-3-way-3-4-mixing-valve.html
>>
>> http://www.cyber-bridge-marine.com/Quick-hot-Water-mixing-valve.html
>> --
>>
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| Re: Water Heater Pop-Off [message #273332 is a reply to message #273036] |
Sun, 08 March 2015 20:00 |
rcjordan
Messages: 1913
Registered: October 2012
Location: Elizabeth City, North Car...
Karma: 1
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Senior Member |
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Last US name brand T&P valve I checked had "China" cast in the body.
SOLD 77 Royale Coachmen Side Dry Bath
76 Birchaven Coachmen Side Wet Bath
76 Eleganza
Elizabeth City, NC
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