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Water Heater Thermostat Issues

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HaRuMaN:
I have a gas hot water heater.  Every morning, before getting a shower, I have to go to the hot water heater and turn the temperature selection knob higher to get the gas to kick on, and then I can turn the knob back to its original setting (fire stays on and heats the water back to the correct temperature).

Any ideas on what is causing this and what I can do to fix it?

DaOld Man:
Need a new gas valve (thermostat), and if it's very old, probably a new heater.

HaRuMaN:

--- Quote from: DaOld Man on November 23, 2010, 09:33:17 pm ---Need a new gas valve (thermostat), and if it's very old, probably a new heater.

--- End quote ---

The heater is as old as the house (about 10 years).  Also, we do have pretty hard water.

DaOld Man:
You can try cleaning it out. You might have sediment around the temp probe, insulating it.

Ed_McCarron:
New heater.  It'll work, it's cheap, and your gas bill will go down.

Oh, and that whole Mythbusters 'heater going through the roof' thing won't happen.

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