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Old 07-19-2017, 06:48 PM   #1
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Water heater too hot

My hot water is way too hot on either gas or electric. Don't have the numbers, but you can't hold your hand under the faucet and it's steaming!
We got the camper late last year and the temperature was fine. I'd read that there are temperature limiting switches for gas and electric ops, but don't know for sure. Does it seem normal for both switches, if it has them, to go south?
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Old 07-19-2017, 07:04 PM   #2
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This is from the hot water heater service manual. Which is in our Document section of this forum.

CAUSE SOLUTION
EXCESSIVE OR INSUFFICIENT WATER TEMPERATURES
By-pass kit valves not set properly ----------------------------Place valves in proper position
Thermostat not seated against tank ----------------------------Reseat thermostat
Defective thermostat----------------------------------------------Replace thermostat
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Old 07-19-2017, 07:05 PM   #3
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There is adjustable thermostat switch out there. Here is a link.

Adjustable Easy Mount Atwood Water HeaterThermostat
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Old 07-20-2017, 09:31 AM   #4
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You can also open the middle valve (that is between the blue and red pipe) on the heater bypass a bit to allow cold water to mix with the hot so the water from the hot tap is cooler. Trial and error as to proper opening for temp you want.
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Old 08-04-2017, 07:37 PM   #5
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You can also open the middle valve (that is between the blue and red pipe) on the heater bypass a bit to allow cold water to mix with the hot so the water from the hot tap is cooler. Trial and error as to proper opening for temp you want.
Great idea! I have the same problem.

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Old 08-05-2017, 05:34 PM   #6
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-did you get it fixed, Ericthered? This might help some of us down the road.
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Old 08-26-2017, 03:49 PM   #7
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No, I have not. I started to try adjusting the bypass valve, then got sidetracked.
By that, I mean I forget about it until I'm in the shower. Then, by the time I get dried and dressed, I've forgotten about it.🙄. That keeps repeating .
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Old 08-26-2017, 03:51 PM   #8
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However, now that it's been brought to my attention, I'm gonna have to get to work on it. Right after I do the other things that I forgot to do.
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Old 08-27-2017, 09:43 AM   #9
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Ericthered
I believe the rational for the high heat is because the hot water tank is so small in these campers that when you adjust the water to the temperature that suites you the hot water will last longer...Ten gallons of hot water doesn't last toooo long, six gallons even less...You just need to be more mindfull of young children using the hot water by themselves...IMHO
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Old 08-27-2017, 10:06 AM   #10
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This summer we've stayed at several parks in which the incoming water was hotter than the water coming from the water heater, between the hose laying in the sun & apparently above water storage it was VERY hot coming from the cold side. This could be some of the issue you are experiencing.
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Old 08-27-2017, 10:09 AM   #11
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sleepyT: you may be correct, but it's just my wife and I. When I turn on only the hot water faucet, it's too hot to hold your hand under unless cold water is added to it and I don't remember that being the condition last year.Having said that, I have a massive case of CRS (can't remember stuff) so it's possible it's no different from last fall.
I'm now trying to adjust the temp by opening the bypass valve on the water heater as a simple to try fix. I'll post the results soon. If I remember......
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Old 08-27-2017, 10:17 AM   #12
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sleepyT: you may be correct, but it's just my wife and I. When I turn on only the hot water faucet, it's too hot to hold your hand under unless cold water is added to it and I don't remember that being the condition last year.
I don't know of any faucets where you turn on only the hot, that you won't get burned.
Stands to reason, if you have the water heater regulated so you can hold your hand in the stream coming strictly from the hot side, it won't take long to empty the water heater.
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Old 08-27-2017, 01:29 PM   #13
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This is an adjustable thermostat you might be interested in, easy to install.
Adjustable Easy Mount Atwood Water HeaterThermostat
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Old 08-27-2017, 01:53 PM   #14
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Lloyd: I guess I was going on the normal temp of a home hot water system, 120 degrees I think. At that temp you can't get burned, but my campers water is considerably hotter than at home (have not measured water temp in camper). On my last boat, the water heater ran on 120v or was heated from the engine coolant. As my normal operating temp was 192, one had to be very careful with that hot water.RussB: that adjustable thermostat is interesting. I think I'll check that one out.
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Old 08-27-2017, 03:40 PM   #15
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Ahhh! How to Get the Perfect RV Water Temperature Without Wasting Water - Roadtreking : The RV Lifestyle Blog
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Old 08-28-2017, 03:31 PM   #16
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After some research, it appears the OEM thermostat is set to 140*. I checked my water temp at the faucet and it was just about 140*.
Observations:
1) my thermostat is working as designed.
2) I can't remember crap😖.
Thanks for all the replies and suggestions.
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Old 09-19-2017, 07:42 PM   #17
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Some follow up. In my last reply, I said the wTer temp was 140*, so normal ops. However, a couple of days later, it was over 150*. So I guess I'm gonna install that adjustable thermostat.
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Old 09-25-2017, 08:07 AM   #18
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Digital Control

My next big project will be installing an Auber controller for the water heater.

Automobile Multimeter for EGT, Boost, Green [SYL-1813G] - $56.50 : auberins.com, Temperature control solutions for home and industry
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Old 04-22-2018, 06:44 PM   #19
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Water heater

Well, i installed the adjustable thermostat that Russb reccimmended. Had to adjust a little, but water is now 124 degrees at the hottest.
Thank you Russb😁.
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Old 04-22-2018, 07:21 PM   #20
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Well, i installed the adjustable thermostat that Russb reccimmended. Had to adjust a little, but water is now 124 degrees at the hottest.
Thank you Russb😁.
I'm glad it worked for you.
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