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What should the temperature be set on a hot water heater.

Thermostat setting

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  • Water Heaters Master
  • 3,368 Answers

The answer different if you have: concerns about diseases, a dishwasher, young children or elderly that can be easily burned, electric vs. gas heat, type of plumbing (e.g. PEX or Copper).

In 1988, the Consumer Product Safety Commission recommended that water heater manufacturers preset the maximum temperature at 120 degrees Fahrenheit to prevent burns. Since several states have mandated this maximum temperature.

Posted on May 03, 2014

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 152 Answers

SOURCE: HOT WATER

Not exactly, the heated water in the tank it self is roughly the desired temperature of the thermostat, there is a variable of 5 to 15+ degrees depending on its calibration. there are other considerations i.e. water heater tank insulation - hot water pipes being exposed to cooler temperatures thus cooling the water in the pipe - the farther distance that the water travels from the heat source, the cooler the water will be at the spigot.

Posted on Feb 21, 2009

freetek
  • 5568 Answers

SOURCE: not enough hot water. I have an Amtrol Extrol coil water heater

Since you mentioned 'both temperatures' it seems your unit is like most all of them, a lower and upper coil.
If your hot water supply runs out quickly, this normally means that the lower coil has failed. Since heat rises, the upper coil will never supply a tankful of hot water, just hot to start, and then as the flow continues, it doesn't have time to do more than warm the water flowing into the tank.
Every home should now own a simple digital multimeter; they cost less than $20 US everywhere and one can find them in auto parts stores, electronic supply companies and tool companies.
If you have a Harbor Freight tool store in your area, you can get them for under $10 US any time and sometimes even less:
Digital meter   
You need to be absolutely certain that the voltage to the water heater is shut down. Before you measure anything else, set the meter to its highest AC setting and check across the coils and then from either contact to the metal housing. If it is dead everywhere, then set the meter to the lowest Ohms scale (normally 200). The resistance of the coil should be nearly the same reading as when you simply short the meter's probe tips together. If it measures 'OL' then the coil is open and must be replaced.  

Posted on Feb 26, 2009

gary1121
  • 332 Answers

SOURCE: when filling bathtub or running two showers, water heater howls

it could be the fact thath the water comming in is what the problem is,, on a well system the water is extra cold and the unit is working hard and with sand aso comming in it makes it harder to keep the temp up on the water,,, flush the tank, put hose on it and open the drin valve with a hose on it turn the cold water on and let it flow till the water comes out clear usually about 5 min,,, get all the sand out and other debris and try it

Posted on Jun 06, 2009

  • 115 Answers

SOURCE: Rheem Gas Hot water Heater; Model 21130DV:

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

Posted on Aug 19, 2009

  • 10926 Answers

SOURCE: the water temp is set to the lowest thermostat

probably has lime and mineral deposits on thermostat and is not getting a correct reading turn off water supply and electrical - drain tank remove screws to heater elements and if build up try cleaning or if to bad replace same with the stat

Posted on Feb 15, 2010

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My gas water heater wont heat water enotgh.


Not knowing if you water heater is new or old , it could be many different reasons what could be causing your problem,
Lets start by mentioning the part where it could be very possible that
the burner is not staying on long enough like it should to get the water hot like you would like to. It could be that the dial in front
of the thermostat is not set at the correct temperature it will show (low-med-hot ) to be set at your desired temperature .
I hope this can give some basic information.

Apr 08, 2014 | Water Heaters

Tip

How to Change the Gas Valve and Thermostat on a Hot Water Heater


<p>If you are having<b> trouble with the temperatures</b> of your <b>gas hot water heater</b> fluctuating too much, or after <b>changing the thermocouple</b> of your gas <b>hot water heater</b> then you may need to change the complete <b>gas valve and thermostat assembly</b>. Also if you have changed the <b>thermocouple</b> and the pilot still will not stay lit, then the gas valve could be bad or the <b>ECO (Emergency Cutout)</b> may have activated and is open. This is a onetime device and cannot be replaced.<br /> <p><br /> <p>These instructions are for the older style <b>gas valve and thermostat combination</b>. These commonly have a large red knob that adjusts the temperature of the water. Also note that the burner tube nut for <b>natural gas</b> is right hand thread, but if you have <b>LP or propane gas</b> the burner tube nut is left hand thread.<br /> <p><br /> <p>The newer <b>gas valve thermostat combinations</b> that have come out recently are similar, but they have a well in the tank that the sensor slides into. The assembly is held fast with a set screw. With this type of <b>gas valve and thermostat unit </b>the tank does not need to be drained, but most of the rest of the change out is similar.<br /><br />To change a <b>gas hot water heater thermostat</b> you will need to first buy a new gas valve for your <b>hot water heater</b>. The <b>gas valve</b> and the <b>thermostat</b> are integrated into one unit.<br /><br />To <b>replace the thermostat on a gas hot water heater</b> you must follow these procedures....<br /><br />1. Turn off the incoming water and<b> drain the hot water heater</b>.<br /><br />2. Remove the <b>pilot tube</b>, the <b>burner gas tube</b> and the thermocouple from the gas valve. Turn off the <b>gas line</b> and remove from the gas valve.<br /><br />3. Get a <b>pump pliers</b> or a<b> wrench</b> in behind the gas valve and turn the whole assembly CCW to remove it from the tank.<br /><br />4. After applying pipe dope or tape to the new gas valve threads, turn the new gas valve into the tank by turning in a CW direction. Be careful not to damage the small wires to the <b>ECO</b>. They are the little red wires on the back. If you break them the assembly is irreparably damaged.<br /><br />5. Reinstall the gas line, thermocouple, burner tube, and the pilot tube to the gas valve.<br /><br />6. Fill tank with water. Make sure to open a <b>hot water faucet</b> and <b>purge all air from the tank.<br /><br /></b>7. <b>Check for leaks</b> where the gas line hooks up with soapy water.<br /><br />8. Relight pilot light and check operation.<br /><br />9. Set the new temperature setting to a medium setting and then adjust the temperature to your liking from there and adequate time for heating completely<br /> <p>

on Feb 25, 2011 | Water Heaters

1 Answer

Rheem 21vp40 1


Copy following links to identify type of thermostat, and see how to adjust temperature on that specific thermostat, and see other ways to increase amount of hot water
http://waterheatertimer.org/How-to-adjust-water-heater-temperature.html
http://waterheatertimer.org/Increase-amount-of-hot-water.html
Add a comment and describe if water heater is gas or electric, and add what other problems you are experiencing.

Jul 14, 2013 | Water Heaters

1 Answer

Not enough hot water ge smartwater water heater gas


1) Copy following links:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html

2) Low temperature setting, extremely cold incoming water, Water leak or broken pipe running hot out of tank, crossover caused by bad faucet cartridge or bad recircirculation check valve,, bad gas control valve thermostat.

Feb 19, 2013 | General Electric GE SmartWater Household...

1 Answer

My gas bill has been going up each month but I have not been increasing the use of hot water. I have turned down the temperature control to the lowest setting (vacation) but the water is still very hot -...


Replace gas control valve.
The gas valve is the thermostat.

Vacation setting should be 50 degrees, or so, depending on exact gas control valve.
If gas water heater is not responding to temperature setting, then thermostat is suspect.

Open following link to help identify tank-type gas valve.
http://waterheatertimer.org/How-to-adjust-water-heater-temperature.html
Each gas valve should have identifying number on side.

Instructions how to replace typical gas control:
http://waterheatertimer.org/pdf/White-rodgers-gas-vale-replacement.pdf
http://waterheatertimer.org/pdf/How-to-replace-gas-control.pdf

Additional resources with service manuals:
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

Add a comment for more help.

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Sep 13, 2011 | Rheem 30 Gallon FVR NATGAS Water Heater...

1 Answer

Lower thetermostatv temprature to 66. it's set to 77 right now and doesn't go lower


Question is not clear.
Add a comment and say what you want to do.

You have 240Volt electric water heater.
Lower thermostat is set as low as it can go at 77.
But you want water temperature set to 66?
First thing to remember is that water heater thermostat settings are approximate since they read temperatures through the steel tank wall.
Second thing is that thermostats for electric water heater are generic, and are not made for lower temperature range settings. This is probably since most people complain that water is not hot enough.
I'm looking at a generic lower thermostat from Lowes right now. The low temperature setting is 90 degrees F.
Looking at some older thermostats from a drawer right now: one does not have a lower temperature mark, the other is a Reliance with low temp of 95, the old craftmaster goes down to 80.
So I don't even have a thermostat that goes as low as the one you have, except for gas water heater thermostats that traditionally can be set to 50 degrees for vacation mode to prevent freezing.
More thermostats can be seen on following link:
http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html

Jul 12, 2011 | White Rodgers 0754-1 Electric Water Heater...

1 Answer

I have an AO Smith Model EES 52 917 hot water heater. This morning my hot water suddenly disappeared. I have tried resetting the breaker with no luck.. I am not sure what else to try.


You have electric water heater.

Inside the upper panel on water heater is a thermostat with red reset button.
1) Click the reset.
2) Put insulation back over thermostat so it is not exposed to cooler air, so it reads correct temperature.

After resetting thermostat, you will have hot water.
The reset automatically clicks off when thermostat detects temperatures in excess of 150 degrees.
The re-set is a safety device, and it keeps everything safe.
If reset will not 're-set' with cold water in the tank, then thermostat is bad, replace thermostat.
You can repair electric water heater yourself following steps on links below

http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html
http://waterheatertimer.org/How-to-troubleshoot-electric-water-heater.html

If the reset clicks off again, just reset it
This is not a dangerous situation
Reset thermostat as many times as necessary until you can fix the problem

If you have trouble fixing the problem, add a comment at bottom of this page and it sends me an e-mail and I will help further

f749bbd.jpg
Thermostats with ECO red reset

Oct 26, 2010 | Water Heaters

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

1 Answer

HOT WATER


Not exactly, the heated water in the tank it self is roughly the desired temperature of the thermostat, there is a variable of 5 to 15+ degrees depending on its calibration. there are other considerations i.e. water heater tank insulation - hot water pipes being exposed to cooler temperatures thus cooling the water in the pipe - the farther distance that the water travels from the heat source, the cooler the water will be at the spigot.

Feb 20, 2009 | Intermatic WH40 - Water Heater Time Switch...

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