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Rheem 40 Gal Water Heater Temperature too hot

I have the gas control to the lowest however water temperature is too hot and can not use to shower.

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Thermostat in heater is faulty and needs to be replaced, get licensed tech to repair.

Posted on Sep 03, 2009

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Why do we need to have to continuously adjust the temperature of the water when we're taking a shower. We have a new Rheem gas .hot water tank


It *may* not be a problem with the water heater itself necessarily. When you say "keep adjusting the water temperature when you're taking a shower" I presume you're talking about turning the shower hot/cold knob(s) and not the temp thermostat on the water heater itself.
If so, when it starts to run colder, turn the knob all the way to full hot. Is the water then very hot? If so, the water heater is working fine & doing its job, and the problem is likely to be in the shower faucet mixing valve itself. Sometimes a faulty one will expand the inner seals/cartridge as hot water flows thru it, and starts to (wrongly) restrict the hot water flow, thus causing the constant need to "turn the dial up a notch".

Oct 29, 2014 | Rheem Water Heaters

1 Answer

Pressure relief valve intermittent noise


check your water pressure and then make sure it is not to high or all the problems you have had were not the answer. it is a pressure /temperature valve not just . temp.

Apr 06, 2014 | RHEEM 40 GAL ELEC Water Heater 6YR SC...

1 Answer

Raise temp above 120


Raising temperature above 120 degrees requires service call.
Or change dip switch settings and risk voiding warranty and causing service call expense.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html#temperature

Earliest versions of Rheem tankless 2006-8 let you set temperature up to 140 degrees F using remote.
However the hotter setting caused error codes because the burner cannot keep up with both high temperature and large volume of hot water rushing through pipe. Especially in winter with cooler incoming water that must be heated more to reach temperature set point.
The burner simply cannot keep up.
So Rheem changed maximum temperature at remote control to tepid 120 degrees, which is not hot enough for folks wanting hot shower, or folks filling whirlpool tub because water in tub cools before tub fills.

Oct 27, 2012 | Rheem Tankless Water Heater Main Remote...

1 Answer

I have a model number 101160 manufactured in 1994. When showering I am using LESS cold water to maintain a reasonable showering temperature. If a tempeature adjustment is required, how do I adjust the...


Water heaters by Rheem have not changed that much over the years. the link below will give you some good information about electric water heaters in general. As water heaters age, the heating element will lose efficiency due to deposits and general build-up of minerals in the tank. Turning up the temp may not be a good idea since the problem is actually caused by a coating on the element. Also make sure that cold water is not bleeding into shower valves thru other single lever faucets. While shower is running, listen to and feel the water lines connected to sink faucets in other rooms for water transferring thru valve. You can actually hear water running at faucet while shower is on if faulty. If other vaucet valves are leaking thru, repair those first before you do anything to the water heater as that is cause of loss of hot water. Good luck.




http://www.rheem.com.au/images/pdf/owners_dom-elec_121996C_0707.pdf

Jul 18, 2011 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

I have a Rheem 40 gal. tank that is leaking water front the top where the vent stack is. It is pouring out. Can it be repaired?


A leaking water heater cannot be repaired, assuming it's the tank leaking and not nearby water pipe.
http://waterheatertimer.org/Water-heater-leaking.html

First thing is to protect your property from catastrophic tank failure where tank ruptures and water runs until it is shut off:
Tanks are under pressure when they are hot.
Close cold water shut-off located above tank.
Turn control knob to 'pilot' so pilot is lit but burner will not turn on.
Open hot side on tub for few moments to relieve tank pressure.

Now your property is safe.
You need a new water heater.
In mean time, gas water heater makes 41 gallons hot water per hour.
Shower used 5-9 gallons hot water.
Bath uses 10-15 gallons hot water.
You can turn on water heater for short stretches and limp by until you get a new heater.

Steps for installing gas water heater:
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Dec 20, 2010 | Rheem 40 Gallon FVR NATGAS Low WATER...

1 Answer

I need to adjust water temperature, and dont have a manual. i have a 81v40d C model , 40 gal electric.


Hi,

Here is a tip that I wrote to help people understand how to adjust the temperature on their electric hot water heater.

Electric Hot Water Heater Temperature Adjustment
heatman101

Oct 16, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

Warm water only


You can eliminate the shower control knob possibility by turning on your hot water anywhere else in the house. If you get hot water in other places, then it could be the knob causing it. A substantial lime buildup in the tank can also cause poor heat transfer from the elements to the water.

Sep 16, 2009 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

Rheem Gas Hot water Heater; Model 21130DV: temperature control dial is set to the lowest setting; water temperature still rises to a dangerous 150 degrees farenheit. Can I replace the temperature control...


yes, sounds like the temp control is bad, you should be able to google model# and thermostat to find replacement. should be fairly easy to swap out

Aug 15, 2009 | Water Heaters

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