NO! 100-120F setting normal. 140F can cause accidental scalding.
You should have a hot water heater for the kitchen for sure and also to have for the bathrooms. I personally like to wash my hands in hot water not cold.
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The gas valve for the water heater should be turned on when you need hot water and off when you do not need hot water.
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Yes. I would. If you are replacing the hot water lines, it is also a good time to drain the hot water heater and get rid of all the junk at the bottom of the hot water heater. That should be done once a year. Your hot water heater must be off when you do that, your hot water heater should be off when you drain your hot water heater. You will see boiler scale come out of your water heater. Leaving the boiler scale in your water heater makes it less efficient. It makes it harder to heat your water. It is the same as throwing money down the drain. If you want to give your money away, you should give it to the Salvation Army instead of the Utility Company.
The hot water heater should be set at around 120 degrees Fahrenheit for optimal efficiency and safety.
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Bradford White
It is a water heater, not a hot water heater. There would be little point in using a hot water heater. I assume that is your point.
Never
The size of wire needed for a hot water heater depends on the heater's wattage and the distance from the electrical panel. It is recommended to consult a professional electrician to determine the appropriate wire size for your specific hot water heater.