It is one or the other. The thermocouple on a gas heater generates a very small current that keeps the gas valve open. A few micro volts. The thermocouple is the small tube that sits in the flame of the pilot light.
Gas heater & electric heater both are available.
If the electricity is on but the gas is off, some types of water heaters may still try to heat the water using the electrical element. This can potentially cause damage to the water heater if it continues to operate without water inside, leading to overheating or even a potential fire hazard. It is best to ensure both the gas and electricity are properly connected and functioning when operating a water heater.
Yes, both thermostats on a water heater should be set to the same temperature to ensure consistent and efficient heating of the water.
flush the heater core in both directions with water
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I remove both heater hoses and use a garden hose to force water through the heater core. I just send water through both ways for a couple of minutes.
NO -- one at a time
There may have been some water left in the heater core when you disconnected both hoses at the firewall. I can't think of any other explanation since there is no water circulating through the heater core.
A tankless hot water heater is both more environmentally friendly and economically sound than traditional storage units because it only heats water for use on demand as it is needed. These water heaters are less wasteful and generally more efficient. However, smaller units are sometimes challenged in meeting multiple demands for hot water at the same time. For a large family or home, consider purchasing a whole house tankless hot water heater system. Another option is to install multiple tankless hot water heaters to operate the dishwasher or washing machine separately.
The recommended temperature setting for a water heater is 120 degrees Fahrenheit to ensure both optimal performance and safety.
Not unless your hot water is continuosly running.
Yes, but both elements are needed for proper heating of water.