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Old 12-11-2013, 06:10 PM   #1
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Adjust Water Heater

Hello, I'm a newbie full timer in a Thor 34K Daybreak motor home. One thing I've noticed since moving onto the rig is that the water temperature is very hot, even scorching.

Does anyone know how to adjust the water heater temperature? What is the optimum temp for someone living in the Pacific NW (temps in the 30s and 40s)? Should this be done by a professional? I was told when I picked up my rig never to monkey with the water heater. But the guy that toured its operation with us was a bit of a jerk so I don't trust everything he told us.

gitarwmn (aka The Culinary Camper)
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Old 12-11-2013, 06:14 PM   #2
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There may be some, but I have never seen an RV water heater with any kind of temperature adjustment.

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Old 12-11-2013, 06:15 PM   #3
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I use the cold water to adjust temperature. This allows you to use less hot water and thereby extend the amount available, especially for showers.
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Old 12-11-2013, 06:25 PM   #4
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If it's a standard Atwood or Suburban you have no temp adjustment. Just less hot and more cold.
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Old 12-11-2013, 06:30 PM   #5
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To adjust the temp turn the cold on first then add the hot water. This will make your hot water last longer in a shower.
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Old 12-11-2013, 06:44 PM   #6
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The water heater is set to produce the hottest water so you won't run out as fast. You could buy new temperature limiters to lower the temperature, but there's no dial or adjustment on the tank. You could change out faucets to a single handle version if you have separate hot and cold valves.
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Old 12-11-2013, 07:25 PM   #7
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The water heaters made in the last dozen years all have a fixed 140 degree thermostat. For some Atwood heater models there is an adjustable thermostat available - here is one of several sources:
ATWOOD MOBILE PRODUCTS 93105 Adjustable Electronic Thermostat : Amazon.com : Automotive

If you are getting scorching hot water from the tap, your water heater is probably very near by. Others have the opposite problem - the heater is far away and the water cools off a lot by the time it reaches the shower or faucet.

The best solution has already been suggested by others - use a faucet that mixes in cold water to a single tap. Better yet, a single lever faucet that lets you easily adjust on the fly.
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Old 12-11-2013, 09:14 PM   #8
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With a limited amount of hot water, not like your 30 to 50 gallon water heater at home, you want the water pretty hot and mix with cold for the desired temperature.

As per the post above, you can add an after market adjustable temperature switch.

Ken
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Old 12-12-2013, 06:04 PM   #9
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Aqua-hot systems have an adjustable mixing valve to control hot water temp.
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Old 12-12-2013, 06:28 PM   #10
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How to replace an RV water heater thermostat, video by Trailer Life.
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