What should you do if you have changed the seat and cartridge many times on your hot water tap in the bathtub and it only lasts for a few days and leaks again?

Only a suggestion...you may try turning off the power, or gas, to the heater and attaching a hose to the tap at the bottom, opening the tap and allowing the tank to "flush out". It's possible you have heavy build-up of sediment and it is being stirred up by the incoming cold water when you use your hot water. Other than the flushing the only other way to clear the tank, if sediment is the culprit, is to turn off the power/gas, drain the tank, and remove the lower element and "scooping" out the sediment with whatever you can fabricate for a small shovel...or use a small vaccum attachment on a shop vac...If all else fails...put a filter in the line.

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