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heater Electric and gas Resources: How to replace electric water heater thermostat How to replace gas control thermostat How to increase amount of hot water |
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Buy residential upper and lower
thermostats Thermostats are interchangeable/ each works with your water heater Temperature range 90-150° Therm-o-disc/ reset trip @ 170° Temperature range 110-160° Apcom/ reset trip @ 180° Local YMCA hot tub = temperature 105°/... Typical shower-bath = 110°F Rated 120, 208, 277, 480 volt AC 89T is discontinued/ replace with Apcom or Therm-o-disc Buy 90-150 degree F for residential tank: Rheem UV11698 Rheem SP11698 Camco 08163 Aprom / 110-160° Water heater thermostats at Amazon Camco thermostats at Amazon More thermostats Resources: Therm-o-disc 59T-66T sell sheet/ pdf Therm-o-disc thermostats Difference between Rheem thermostats |
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Safety and inspection Cautions: Use adequate lighting. Inspect for leak, rust. Never touch wet water heater, or water that was wet. For safety, turn off 30 Amp circuit breaker. Troubleshoot electric water heater  How to check if power is offAverage bath-shower temperature 104° Save 3-5% operating cost for adjusting 10° lower |
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Use Flat & phillips screwdrivers + Flashlight Resources: How to test if electricity is OFF Troubleshoot leaking water heater |
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Electric
thermostat Remove covers (save screws) Pull out insulation <>Top thermostat is larger <>Bottom thermostat is smaller  Don't touch
or move wires Insulation
& cover must be put back when finished or thermostat will not
read correct temp |
 Adjust temperature using screwdriver How to replace thermostat |
Therm-o-disc
thermostats Rated 120, 208, 277, 480 volt 90-150°F range.  ECO trip
170°F +/-5°FDifferent models can have higher range, but numbers for temperature are different. Use flat tip screwdriver to set upper and lower thermostats to 120° this temperature is good for most homes. For more hot water, set upper thermostat 5-10° higher. All water heater thermostat settings are approximate > test result at faucet with thermometer. Resources: Ways to Increase amount of hot water Wire thermostat Troubleshoot thermostat Replace thermostat Buy: Water heater thermostats |
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Apcom thermostat Rated 120, 208, 277, 480 volt 110-150°F range. ECO trip 180°F +/-5°F Different models can have different range, but letters for temperature are different. If 120° leaves you short of hot water, the tank could have sediment build-up Resources: How to clean sediment out water heater How to flush water heater/ steps |
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Apcom thermostat for small under-counter or point of use water heater. Resources: How to install point-of-use water heater |
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Burned
thermostat Buy: Water heater thermostats Resources: How to replace thermostats Test thermostats Wire water heater thermostats Troubleshoot electric water heater |
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1) Make sure thermostats
are covered with insulation, protector, and
cover. See image Without insulation, Thermostat exposed to room temperature will misread temperature and cause overheating. 2) Make sure thermostat sits flat against tank wall. Wiggle thermostat. Check that bracket is not rusted and loose. |
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Finish electric Put covers on <> make sure insulation is put back or cool air will cause thermostat to misread temp <> put metal covers on <> pick up tools <> turn on circuit breaker Resources: Inspect for water on floor or leaking pipes Troubleshoot leak |
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Resource
Whirlpool and Craftmaster Energy Smart Choose 4 different energy settings plus adjust temperature using selector. Adjust thermostat from 80° to 150° |
| Gas | |
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 Do not turn off gas unless smell of gas is present Cautions: Use adequate lighting. No candles, open flame or smoking. Inspect for leak, rust, soot, missing parts. If you smell gas, leave building, and call gas company. Minor gas leak, shut off gas to heater, and call gas company. Gassy smell but no gas leak, clean soot from flueway. How to clean flue Troubleshoot gas water heater  BuyFlashlights at Amazon Headlamps at Amazon Safety Equipment for Professionals |
 Thermostat
probe or sensor is immersed in water inside tank.Water temperature around the thermostat probe can drop 15-25° before main burner is activated. Thermostat probe is same-similar for all types of gas water heater control valves. The temperature sensor (copper tube) contains two things: "the ECO (energy cut off), and a temperature probe thermistor. Thermistors are thermally (heat) sensitive variable resistors. A change in water temperature changes the resistance (measured in ohms) of the thermistor. The gas  control valve interprets
change in resistance as a
change in temperature and uses information to
activate and deactivate call for heat."ECO (energy cut off) will trip if water inside residential tank exceeds 180-188°F high limit. This will cause thermostat to shut off gas to burner. ECO is typically single-use and gas control must be replaced. The new electronic gas control, such as Intellivent control valve used on some power vent models, and the Honeywell electronic gas control valves are resettable after overheat event. Models vary, and reset is not possible for every condition. Calibrate Gas control valve: Calibration on Gas valve is approximate by 5-8°F. If calibration is far off, then rotate dial so temp at faucet is good. If temperatures fluctuate, then plumbing is first suspect. Check temperature of water at TP valve and at water heater drain valve. Check for stacking or crossover If plumbing checks out, gas control might be bad. If temperatures inside tank drop too low before water heater turns ON, then gas valve is bad. Resources: How water heater thermostat work Basic parts and operation of gas water heater |
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