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Some boiler questions

Mike Lamb

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Most of the household boilers I see have no backflow prevention valve. Does the pressure reduction valve also serve as a backflow valve?

Is there a simple way to tell if the circulation pump is working. Most have no visible moving parts. I can usually feel them vibrate but I don't know if that is an indication of whether it is actually working. Sometimes cast iron radiators heat up pretty quickly and sometimes not.

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