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Old 07-31-2009, 01:10 AM   #1
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retrofit pump on gravity boiler


I would like to remove the old cast pipes feed two radiators in from a gravity feed heating system. My question is, can you attach a pump to some or all lines running off the boiler? My belief is that an old gravity feed boiler wouldn't have the heat transfer capacity to heat moving water thus rendering the system useless or terribly inefficient.

I want to raise the pipes, which run through a hallway and laundry room, into the ceiling with wirsbo. I believe it would be difficult to maintain a consistent incline, which indecently, the current pipes don't adhere to all that well, so I would like to add a pump to that line, or if necessary, all lines to keep heat flowing to these radiator.

Can this work or not

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Old 07-31-2009, 06:11 AM   #2
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retrofit pump on gravity boiler


It can work.

Be carefull not to run too small of a pipe.

You need to match the circ to the piping restriction, and boiler BTU.

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Old 07-31-2009, 09:31 AM   #3
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retrofit pump on gravity boiler


cool, would the pump need to be installed to the entire system or can it be installed to the one loop that's being modified leaving the others gravity fed. If it's installed to the modified loop alone, is a check valve or something requred and where would it be inserted, return side of other loop(s)?

Last edited by InquiringMind; 07-31-2009 at 09:51 AM.
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Old 07-31-2009, 03:20 PM   #4
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retrofit pump on gravity boiler


The whole system needs to use the circ, if its all controled by the same thermostat.

You can use a circ wiha built in flow check,
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