Hot Water Circulation Pumps

Hot water heating circulators or circulator pumps: install, troubleshoot, repair details: this article discusses Circulator Pumps: how to find, inspect, diagnose, and repair problems with Hot Water Heating System Circulator Pumps or circulator pump relay switches and controls.

This article answers most questions about Heating System Boiler Controls on central heating systems to aid in troubleshooting, inspection, diagnosis, and repairs.

Circulator pump relay switches & controls on heating systems: Troubleshooting & Repair Guide, How to tell if a heating circulator pump is working, Why do some heating zones work and others not, why does heat come out of zones where thermostats are not calling for heat?

How to fix an air-bound heating system and blocked circulator pump,
How to cure circulator pump noises, Where should a circulator pump be installed on a heating boiler? On the inlet or on the outlet side of the boiler? Use of air exit tanks and circulator pumps on heating boilers.

Heating Circulator Pumps: how are circulators used to control heating zones & how do we Diagnose & Fix Circulator Pump Troubles?

Heating circulator pumps or "zone circulators" are used to force hot water from the heating boiler through radianting devices such as hot water baseboards or radiators. The circulator is switched on as needed or in some designs may be wired to run continuously.

Proper installation, protection from leaks, and lubrication at annual service can give a long circulator life. Poor maintenance or improper installation can give less happy results.

Hot water may be circulated throughout multiple zones using a single circulator pump and individual zone flow control valves, or each heating zone may be built with its own individual circulator pump.
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Either approach to individual heating zone control can work just fine - using zone valves or using individual circulators.
Our photo above shows a single circulator system. 

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