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Old 12-03-2008, 09:51 AM   #1
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Boiler circulating pump question

My circulating pump runs only when the boiler is heating. I've read in other places that the circulating pump should run all the time.
Can I get some opinion on if it should run all the time or run only when the boiler is heating. The system is a single zone baseboard loop.

Could someone tell me the name of the tool used to open the purge valve at each baseboard radiator? Some use a flat screw driver and some look like a square that is recessed into the purge valve. Thanks for the input.


Last edited by timothy918; 12-03-2008 at 09:53 AM. Reason: added word
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Old 12-03-2008, 11:32 AM   #2
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The circulating pump should cycle with the heat. If it ran constantly it might overheat the house.

The tool for opening the bleeders is called a key. The bleeders with slots are called coin vents, the square bleeders are called key vents.
You should be able to find a key at your local plumbing supply.


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Old 12-03-2008, 08:54 PM   #3
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cold start type boiler.....if the stat is calling the pump should always be running.the only thing that will cycle (due to setting)is the main gas when the boiler is at water temp.setting.that key can be got at HD.
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Old 12-04-2008, 04:14 AM   #4
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Unless your using outdoor reset. And you don't use it for domestic hot water.
No need to run your circulator 24/7.
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