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You'll probably need to replace the relief valve again but you have an underlying problem. You unit is either running at excessive temp or pressure. Since these valves almost never release on temp (the water would have to be near 200 for it to dump on temp) it's likely dumping on pressure. So you need to install a thermal expansion tank. When the water in the tank heats up it expands. If the water pressure is too high to start with or you have a check valve on the water main then the pressure rise can be excessive and the relief valve will dump. So you need a thermal expansion tank to absorb the excess pressure. You must use an expansion tank that's made for water heaters not for hot water heating systems.