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drip from relief valve on boiler

16 years ago

We have water dripping occasionally from the pipe leading from the relief valve on our boiler. A plumber first tried putting in a new pressure reducing valve, then replaced the relief valve itself, but it still drips when the heat kicks on. We live in an old house, and the expansion tank is very old--a big long tank suspended from the basement ceiling. The tank hasn't been drained in at least ten years. Could that be the cause of the problem? Is this something we can drain ourselves, or should we call someone in? Should we be calling a plumber or an HVAC company?

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