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how many pumps can i use on heating system?

have 17 rads 16 gets heat +hot water 1 rad in attic not getting any heat do i need a 2nd pump and where would be best place to install 2nd pump
mike, November 2011
If you have bled the radiator, you could check if your pump has adjustable output, some do, & ensure that is set to maximum.

davidj, November 2011