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Old 01-06-2017, 12:59 PM   #1
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Hot Water Heater

I have a 2015 RV and when we first purchased it the hot water seemed too hot. Now after a year the water does not seem to be as hot, or as hot as we would like it. I checked to be sure the tank is full by using the releaf valve. I heated the tank with LP until the burner stopped, the water is hot but not scalding, and does not seam as hot as it used to be. So I was wondering if it is just the time of year or if there is a sensor that could cause the water to not get as hot?
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Old 01-06-2017, 01:04 PM   #2
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Make sure the hot and cold valves are closed on your outside shower. Inside shower too, if someone uses the shut off on the shower head to stop the inside shower instead of the hot / cold valve on it. These can provide a path for cold to mix with hot if open.

The hot water heater control board has a water temp sensor that when working normally will turn off both the gas burner and electric heating element when it senses water temp in the tank at the 140 degree range.
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Old 01-06-2017, 01:19 PM   #3
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take a meat thermometer or similar and check the temp of the water coming out the kitchen sink when the unit kicks off. It should be in the 130 degree range.
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Old 01-06-2017, 01:20 PM   #4
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More specific info could be posted IF you would provide Brand/Model of water heater

Generic info.
As suggested it could be as simple as an outside shower being turned off via button on handle vs the cold/hot knobs. This allows cold/hot mixing creating only luke warm water in hot system

Could be water heater 'bypass' valve on backside of water heater is not fully closed.'
Again cold/hot mixing----luke warm in hot system

Could be 'mixing valve' clogging up ----again luke warm water

IF water in tank is HOT (s/b at minimum 130*F....could be as high as 160*F-----model specific) then issue is after water leaves tank
Suburban-------130*F normal
Atwood--------- 140*F normal
Atwood XT------160*F normal (in tank).....130*F out of mixing valve

Again..brand/model ????
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Old 01-06-2017, 01:23 PM   #5
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If you have a Suburban WH then its possible rust under the temp sensor pack is insulating it a bit. Easy to take apart and check/clean where it mounts.
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Old 01-06-2017, 01:26 PM   #6
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No such thing as a hot water heater.
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Old 01-06-2017, 01:32 PM   #7
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No such thing as a hot water heater.
Imagine a water heater full, no water has been used recently.
The water eventually cools enough that the thermostat does it's thing and the burner lights (gas or electric) - but even at this point the water is still hot enough to use, so yes - there is such a thing as a hot water heater. It takes hot water, and makes it even hotter.


To the OP, it could be your thermostat acting up, but I'd first look to bad or open mixing valves as other have suggested.
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Old 01-06-2017, 01:33 PM   #8
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Thank you all. I appreciate your feed back and information. I will try the meat thermometer water temperature test and let you know what I get and I will also provide the brand and model of the part.
Dennis
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Old 01-09-2017, 12:18 PM   #9
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Hello, I have a "Atwood L.P. Gas Water Heater model 4-E or 10 E". I now have it working properly. Today I heated the tank with both the electric and gas and used a meat thermometer and the temp was 98 degrees. I went around and verified the shower inside and outside were off, still 98 degrees. I followed the water line in and around the tank, then I spotted a half turn valve that was at the back of the heater with a Red hose out of the tank, then the valve then a blue hose, the valve was in the open position. I turned it to close then checked water temp and it was 141 degrees.
Not sure what the valve is for, no mention of it in the Atwwod instructions or I missed it.
Possibly someone that reads this will know for sure.
Thank you for your help.
Dennis
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Old 01-09-2017, 12:35 PM   #10
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After re-reading the manual the valve I asked about above seems to be a manual mixer that can be adjusted to control the mix of hot cold to the desired temperature.
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Old 01-09-2017, 12:45 PM   #11
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Thanks for getting back to us on the solution to your problem. Too many times people don't ever tell us what solved their problem.
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Old 01-09-2017, 02:37 PM   #12
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Yes some Atwood heaters have a mixing valve on the back of the heater. It takes 160 water and mixes it down to 130 or so when it leaves the wh. It makes a 10 gal heater act like a 15+ gallon heater. Ours got calciumed up and started causing problems. Had it removed but did not have a replacement so just bypassed it. We now have HOT water at faucets. Just have to be careful. We mix our own😆.
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Old 01-10-2017, 10:40 AM   #13
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Quote:
Originally Posted by Podivin View Post
Imagine a water heater full, no water has been used recently.
The water eventually cools enough that the thermostat does it's thing and the burner lights (gas or electric) - but even at this point the water is still hot enough to use, so yes - there is such a thing as a hot water heater. It takes hot water, and makes it even hotter.


To the OP, it could be your thermostat acting up, but I'd first look to bad or open mixing valves as other have suggested.
So, would it be a cold water heater or water temperature maintainer? If it's hot, there's no need to heat it.
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