Run it on propane and let water heater go through a heating cycle, and when it shuts off, CAREFULLY , pull the lever on the pressure relief valve slightly and see how hot the water feels there. If it's hot there, then it's more than likely a problem with your by-pass valve(s) at the back of the water heater. Either in the wrong position, or faulty, and allowing hot and cold to mix. If in doubt which one it may be, you may be able to remove by-pass set-up completely, depending on what system you have. What the ultimate goal is would be to attach your incoming cold line directly to bottom fitting of water heater, and outgoing hot line, to the top. Not unusual in some systems for one of the shut-offs in between the 2 lines to stay partially open, and allow cold to mix with hot, thus -warm only. If it's not hot at pressure relief valve, then I suspect a faulty thermostat, but that would mean they both (hydro and gas) would have to be faulty which is unlikely.
261 views
Usually answered in minutes!
×