That is my question---80F---we have hot water heat floor registers NO FANS. THE OUT DOOR BOILER SENDS hot water to a heat exchanger. The out door wood boiler is not a pressure system. The house system is a pressure system. These two systems are linked by a HEAT EXCHANGER...Both systems have their own PUMP and the pumps are set to run all the time. If the pressure side pump is not working the system builds too much heat and also too much pressure..
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