Reply To: Circulator pump in hot water central heating causes hum throughout hou

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Harold Kestenholz
Participant

In another view, your house was built 90+ years ago. At that time, a water heated system often was a gravity system, designed to work without a circulator. If that was the original intent and the system is the same, the water moved around the system for decades by the different weights of hot and cold water. A circulator would be spinning freely doing little necessary work. An unloaded circulator can make noise.

A circulator doesn’t make noise when it is still in the box on the shelf. I wonder if your system can run well without the circulator running at all. A method of controlling the temperature would be an outdoor reset controller. There are still some living people who can understand a gravity system.

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