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The first thing to check is flush the tank to remove sediment that may be reducing hot water storage space. This flushing should be done every three years.


If it's a gas water heater, it could be a combustion air intake. Without it, the heater will not have enough oxygen to maintain a flame. You should be able to prevent mice from entering the vent, by covering it with a grate, grill, or screen. As for lint being drawn in, it sounds like you have to investigate how the dryer is vented.


Most of the on demand water heaters require at least 20 psi for operation. Pressure in a propane tank, large or small, can range between 100 and 200 psi. I am assuming that a device that requires ~30 psi (which is a common size for preset propane regulators coincidentally) would not be engineered to withstand constant 200 psi pressure. Yes, you need a ...


If the tank itself is rusted out, it's time to replace it. Water expands when it's heated, which creates pressure in the system. Pressurizing a rusty water tank is a recipe for disaster. Replace the tank before it causes problems. Trying to eek out a few more months is foolhardy.

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