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

Thermostat setting

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  • Water Heaters Master
  • 3,382 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

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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

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  • 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

  • 13708 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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Water pressure good, thermostat calling for heat boiler ignites , heats to 80, turns off, drops to 40 reignites - keeps this cycle going. temp sensor? return sensor? any help appreciated


the thermostat has an upper and lower setting at which point to turn the unit off and back on
most have a 10 degree variation between off and on so that a steady temp is maintained
check to see if the lower setting can be raised closer to the 80 degrees
if not consider a new thermostat with closer settings

Feb 13, 2016 | Water Water Heaters

1 Answer

How to adjust thermostat


How to Adjust Honeywell T6360b1028 Thermostat? ' DIYnot Forums

www.diynot.com > Forums > How to... > Plumbing and Central Heating
Unless the thermostat is faulty, the point where your 'stat clicks is your actual roomtemperature. If your 'stat doesn't 'call for heat' when set to 18 and your room ...

Nov 01, 2015 | Honeywell T6360b1028 Room Thermostat

1 Answer

Symptom: water gets too hot, before and after thermostats are replaced, burn mark and insulation swelling/melting on non-common wire from upper element to upper thermostat, and the breaker trips.


Double check the thermostat connection and setting; if it persists, I would add a pipe hugging thermostat connected to a shunt trip for the heater elements.

Jul 26, 2015 | Water Heaters

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

How do I turn on the central heat in a kz jag rv


Turn on your propane and set thermostat to heat and adjust temperature. It should all start on it own, as long as plugged in or fully charged battery connected. If it doesn't fire up first few tries, shut off and try again as it may take a few times to purge propane . If no AC on unit and thermostat is for heat only, there may be a lever on bottom side of thermostat to push over for on, then set thermostat temperature. If any problems, get back to me and I'll walk you through it.

Feb 13, 2011 | Water Heaters

1 Answer

Is there a thermostat on my vulcan model number 6809L?


Every water heater has a thermostat. if it did't then the water would continue to heat until the pop off valve blew. not a good thing. The thermostat is usaully under the front panel and has a dial on it to change settings. Note that some newer water heaters have an electronic thermostat but still has adjustments.

Dec 31, 2010 | Water Heaters

1 Answer

What is the energy factor for the mod.82V80-2? I have two seperate 30amp circuits, one for the top element and one for the bottom element, if that changes anything.


http://www.rheem.com/product.aspx?id=09DF2BDD-5E11-4D32-B574-84ACFB8A4619
http://globalimageserver.com/fetchDocument.aspx?id=052c9e32-ce37-48d7-8990-9e430f23fef3

82V80-2 Energy factor is .86 according to water heater industry self-regulated standards.

Rheem pdf says these water heaters are wired for non-simultaneous operation.
Except special order water heaters.
Non-simultaneous operation uses single 240V circuit as described below.
If your water heater is wired for simultaneous operation, and each element is on a separate circuit, that makes your water heater special order. I would guess the reason is for higher first-hour delivery, which implies rapid heating and would likely affect energy factor.
You might want to get serial number off model and call Rheem for specs on that special order.

Your water heater energy factor may be the same because 'energy efficiency is based on the amount of hot water produced per unit of fuel consumed over a typical day.' This means an aircraft carrier can be considered highly efficient despite overall cost. And naturally the guys making the aircraft carrier are also doing the rating.
http://www.energysavers.gov/your_home/water_heating/index.cfm/mytopic=13000

Non simultaneous operation means the upper thermostat controls heating functions.
240V goes to upper thermostat first.
When water inside tank is cold, thermostat reads temperature through tank wall.
Upper thermostat turns on upper element until top 2/3 of tank reaches thermostat set point.
Once set point is reached, upper thermostat turns off upper element and sends power to lower thermostat and lower element.
Lower thermostat reads temperature through tank wall, and turns on lower element until bottom 1/3 of tank reaches thermostat set point.
As water cools inside tank, lower thermostat is first to respond since hot water rises.
Lower thermostat turns on lower element until tank again reaches set point.
When hot water faucet is turned on, hot water exits top of tank.
At same time, cold water enters bottom of tank through the dip tube.
The heating cycle repeats.
At all times, the electricity flows through upper thermostat. And upper thermostat is powered by one 240V circuit.

With simultaneous operation, the upper and lower thermostats work in same manner.
Except thermostats are wired separately.
Lower thermostat does not wait for upper part of tank to be heated first.
Lower thermostat turns on whenever lower part of tank cools.
The advantage is more hot water available rapidly when demand is high. This is called first hour recovery.

One method for reducing electric consumption is to set lower thermostat so it only turns on during certain times of day. For example Whirlpool Energy Smart operates in this manner and shaves a few bucks off the bill each month. This says that simultaneous operation is not an energy saver, unless that circuit controlling lower thermostat is set on a timer.

Dec 06, 2010 | Rheem 80 GAL ELEC TALL Water Heater 6YR SC...

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

Main remote control is not working can you bypass the remote temporarily


No. However you may be able reset the thermostat to its factory setting.
Turn the thermostat off.
Shut of the gas and water supply to the unit.
Unplug or disconnect the unit from its electrical power source. Disconnect the thermostat from the heater.
Wait approximately 5 to minutes, and then reattach the thermostat wires to the heater.
Turn the water supply on and open the tub faucet to its hottest setting for about a minute.
Turn the faucet off and make sure no water water is flowing anywhere in the house.
Turn the gas supply back on.
Reconnect the thermostat wires to the heater.
Connect or turn the power supply back on.
Wait at least 2 minutes before turning the thermostat power button back on.
After the thermostat power button has be pressed, wait an additional 2 minutes before running water.
Test the heater at this time. Turn the water on at the farthest faucet to its hottest setting. measure the temperature with a cooking thermometer.
If you need to make adjustments to the water temperature, either up down, shut all the faucets off first.
The thermostat should read 100 degrees Fahrenheit when it first starts.
If you are receiving an error massage, consult with the manufacturer.
If the thermostat is reading the correct water temperature but the unit is not operating, there are other issue need to deal with. Let us know if this works or you need further assistance.


Sep 26, 2010 | Rheem Tankless Water Heater Main Remote...

1 Answer

AE115....1 element keeps heating after water is turned off causing overheat sensor to trip.


Hello, W/D here.

You have a defective thermostat. The elements will continue to heat until they reach the set point of the thermostat. Try to lower the temp setting first. If that does not fix it, you'll need to repalce the thermostat, located very near the element, under the screwed cover on the side of the tank.
Best regards, --W/D--

Aug 17, 2009 | Powerstar Water Heaters

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