How does the thermostat work on a gas water heater?

The thermostat is a thermistor that responds to heat by producing a small electric current. The current increases when water temperature increases, and drops when temperature drops. Changes in the electric current cause gas control to turn ON and OFF. When gas control turns ON, it releases gas to burner.

Can you replace a thermostat on a gas water heater?

The water heater thermostat is part of the gas valve. They cannot be replaced separately from the valve. If you think you are having a problem with your gas valve, see the article, ‘Troubleshooting Gas Valve Problems’ for more information.

What happens when thermostat goes bad on water heater?

Usually, when the upper thermostat goes bad, you will have no hot water at all, while a bad lower thermostat makes itself known when there is only a small amount of hot water before the tap water goes cold. Once you have determined the faulty thermostat, you can replace it and have your hot water heater working again.

Is the water heater thermostat part of the gas valve?

The water heater thermostat is part of the gas valve. They cannot be replaced separately from the valve. If you think you are having a problem with your gas valve, see the article, ‘ Troubleshooting Gas Valve Problems ‘ for more information.

Is it easy to adjust a gas water heater thermostat?

– Adjusting a gas water heater thermostat is pretty easy. Changing a gas valve is a bigger job.These repairs will have a Difficulty Level of: A Bit of Work; These repairs require a Skill Level of: Handyman. For and explanation of the terms in this section, see ‘ How to Use This Site ‘.

What happens when the pilot light goes out on a water heater?

Once it’s up to heat, it keeps the pilot light valve open and provides voltage for the other controls. Also, if the pilot light goes out, voltage drops, and all the valves remain safely closed until it is re-lit. So, my water heater has a thermocouple, which other sources suggests creates ~75 millivolts of electricity, which is tiny.

What is the thermocouple on a gas hot water heater?

Gas Water Heater Thermocouple The thermocouple is a sensor that tells the gas valve when to allow gas to flow to the burner. Gas hot water heater troubleshooting often involves the thermocouple. When they go bad the will not allow the gas valve to release any gas.

How does the pilot light work on a water heater?

The water heater uses the piezo igniter to light the main gas burner, and when it is pressed down, it releases the electric spark. The spark gap is factory set (0.125″) and should be maintained. When troubleshooting lighting problems, it is recommended to test it first. Turn the gas OFF to the water heater and press the piezo igniter.

The water heater thermostat is part of the gas valve. They cannot be replaced separately from the valve. If you think you are having a problem with your gas valve, see the article, ‘ Troubleshooting Gas Valve Problems ‘ for more information.

What happens when there is no pilot light on a gas heater?

If there is no pilot light or is blown out, the tip of the thermocouple cools off and stops generating electricity so the gas valve closes and the unit shuts off. Every gas appliance is equipped with similar safety devices, prevent gas leaking inside the house.