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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.


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 ...

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