Atwood hot water heater thermostat question
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Jan-26-2020 04:27 PM
Edit: googling found that Atwood thermostats are set at 140 degrees from the factory so I will look for a 130.
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Jan-27-2020 04:30 PM
Atwood 91470 Thermostat at Amazon $12.35
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Jan-27-2020 02:24 PM
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Jan-27-2020 06:38 AM
dougrainer wrote:tallpall888 wrote:
True...and we have had no problem with lack of hot water with this 10 gallon unit. There *is* a problem with the safety valve blowing occasionally and this is the second valve for that heater so the thinking is there is a problem with the thermostat letting the water heat too much. Replacing with even the standard temp sensor might have helped, but I don't anticipate the 130 degree unit I just ordered ($10 ebay) will be noticed.
The Pop OFF valve RARELY fails. What you have is a diminished AIR POCKET
in your Atwood tank. Doug
PRESSURE-TEMPERATURE RELIEF VALVE Weeping or dripping of a pressure-temperature relief valve while the water heater is running DOES NOT mean it is defective. This is normal expansion of water as it is heated in the closed water system of a recreation vehicle. The Atwood water heater tank is designed with an internal air gap at the top of the tank to reduce the possibility of weeping and dripping. In time, the expanding water will absorb this air. To replace the air follow these steps: Step 1: Turn off water heater Step 2: Turn off incoming water supply Step 3: Open the closest hot water faucet in the coach Step 4: Pull handle of pressure-temperature relief valve straight out and allow water to flow until it stops. Step 5: Allow pressure-temperature relief valve to snap shut, turn on water supply and close faucet.
I agree the air gap has to be there to absorb expansion of the heated water. I think you will find that the manual for the water heater instructs you how to do that.
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Jan-27-2020 06:15 AM
tallpall888 wrote:
True...and we have had no problem with lack of hot water with this 10 gallon unit. There *is* a problem with the safety valve blowing occasionally and this is the second valve for that heater so the thinking is there is a problem with the thermostat letting the water heat too much. Replacing with even the standard temp sensor might have helped, but I don't anticipate the 130 degree unit I just ordered ($10 ebay) will be noticed.
The ECO on your unit is at 180 degrees. Going from 140 to 130 is NOT going to stop your problem. Reinstalling the AIR GAP will. Doug
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Jan-27-2020 04:19 AM
Thank you all for your attention!
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Jan-27-2020 04:14 AM
tallpall888 wrote:
True...and we have had no problem with lack of hot water with this 10 gallon unit. There *is* a problem with the safety valve blowing occasionally and this is the second valve for that heater so the thinking is there is a problem with the thermostat letting the water heat too much. Replacing with even the standard temp sensor might have helped, but I don't anticipate the 130 degree unit I just ordered ($10 ebay) will be noticed.
The Pop OFF valve RARELY fails. What you have is a diminished AIR POCKET
in your Atwood tank. Doug
PRESSURE-TEMPERATURE RELIEF VALVE Weeping or dripping of a pressure-temperature relief valve while the water heater is running DOES NOT mean it is defective. This is normal expansion of water as it is heated in the closed water system of a recreation vehicle. The Atwood water heater tank is designed with an internal air gap at the top of the tank to reduce the possibility of weeping and dripping. In time, the expanding water will absorb this air. To replace the air follow these steps: Step 1: Turn off water heater Step 2: Turn off incoming water supply Step 3: Open the closest hot water faucet in the coach Step 4: Pull handle of pressure-temperature relief valve straight out and allow water to flow until it stops. Step 5: Allow pressure-temperature relief valve to snap shut, turn on water supply and close faucet.
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Jan-27-2020 04:10 AM
ggardne2 wrote:
Just for info most Atwood/Dometic water heaters have a front mounted thermostat that controls the 12V propane circuit and on the back of the heater there is a second thermostat that controls the 110V element. If you only change the front thermostat it will impact the propane temperature but will have no impact on the electric element temperature. Unless you have a rear access panel or access to the back of your water heater you will need to remove the water heater to access the thermostat for the electric element (at least on any Atwood I have experience with). You can verify this information by reviewing the wire diagrams in the manual to your water heater.
Atwoods more than 15 years ago had 120 and 12 volt(LP) tstats. Since then they use just 1 tstat for both modes. Doug
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Jan-26-2020 07:33 PM
https://www.rvtravel.com/video-how-to-install-an-adjustable-water-heater-thermostat/
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Jan-26-2020 06:51 PM
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Jan-26-2020 06:48 PM
Maybe today they will last longer. Go ahead and try it, just keep the original with you so you can put it back in if the new one dies.
Dusty
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Jan-26-2020 05:55 PM
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Jan-26-2020 05:26 PM
Disregard this post if you've seen this one already. I just re-read your original post.
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Jan-26-2020 05:10 PM
All Motor Homes are RV's. All RV's are not Motor Homes.
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Jan-26-2020 04:56 PM
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