Good Sam Club Open Roads Forum: Atwood hot water heater thermostat question
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 > Atwood hot water heater thermostat question

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tallpall888

Middle Massachusetts

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Posted: 01/26/20 06:27pm Link  |  Quote  |  Print  |  Notify Moderator

My hot water, which operates only on electric, gets too hot and I wish to cool it down a bit. I would like to order a thermostat that will activate (open) at a temp that is ten degrees cooler than what it does now. Have seen the adjustable units on ebay but would like to spend a lot less for just a fixed temp unit. The modules for sale on ebay seem to be the standard replacement ...and don't mention what temp they are set for. Can someone point me to an ebay thermostat that would fit the bill? Thx for any help!

Edit: googling found that Atwood thermostats are set at 140 degrees from the factory so I will look for a 130.

* This post was edited 01/26/20 06:47pm by tallpall888 *

Flute Man

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Posted: 01/26/20 06:34pm Link  |  Quote  |  Print  |  Notify Moderator

RV water heaters are designed to be extra hot which makes the small tank last longer. Just mix in Coldwater if it’s too hot for you.


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Posted: 01/26/20 06:56pm Link  |  Quote  |  Print  |  Notify Moderator

I always had the same problem w/ all my attwood heaters. I replaced the 140s w/ 120's still plenty hot. I got them at the RV parts places for about 20 bucks.


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cavie

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Posted: 01/26/20 07:10pm Link  |  Quote  |  Print  |  Notify Moderator

turn down the hot. turn up the cold.


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Dave5143

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Posted: 01/26/20 07:26pm Link  |  Quote  |  Print  |  Notify Moderator

This maybe? Assuming it's an Atwood unit. I ordered one for my rig but haven't installed it yet.
Disregard this post if you've seen this one already. I just re-read your original post.


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tallpall888

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Posted: 01/26/20 07:55pm Link  |  Quote  |  Print  |  Notify Moderator

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.

Dusty R

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Posted: 01/26/20 08:48pm Link  |  Quote  |  Print  |  Notify Moderator

Many years ago I put an adjustable t-stat on our water heater. I don't remember how long it lasted, maybe only a couple of years, but it didn't last.
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.

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ggardne2

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Posted: 01/26/20 08:51pm Link  |  Quote  |  Print  |  Notify Moderator

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.

DFord

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Posted: 01/26/20 09:33pm Link  |  Quote  |  Print  |  Notify Moderator

I haven't tried this adjustable thermostat but it's the only alternative offered that I know of. I think the OEM stats keep the water close to 140 degrees

[image]

https://www.rvtravel.com/video-how-to-in........l-an-adjustable-water-heater-thermostat/


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dougrainer

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Posted: 01/27/20 06:10am Link  |  Quote  |  Print  |  Notify Moderator

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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