water heater - Pressure problems with oil boiler - Home ...
2015-4-14 · The last technician indicated there were only two ways the pressure in the boiler could increase: through the water intake valve or a faulty expansion tank, and through backpressure from the external hot water heater (heated via a boiler zone). To validate it wasn't the water intake valve/expansion tank, I shut down the system, closed all ...
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