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The only relief valve on the tank is a pressure valve. This has been replaced once before. A couple of weeks ago, it managed to 'fix' itself, and was great for 3 days, then started up again. It seems like it cant maintain the air gap properly, but if I reset the air gap, then refill the tank...

Hi, We have a megaflo unvented water heater in our apartment, and it started dripping water from the pressure relief valve some time ago. This got progressively worse, to the point where we called out a plumber and he replaced the pressure relief valve. This solved the problem for a few...