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Posted by Daniel on November 17, 2005 at 00:56:48:
Last spring I replaced my very old boiler with a NTI wet leg boiler. When I did this I placed a circulator on the supply side of the boiler and repiped near the boiler. Prior to this new installation my system ran by gravity, it had two 2 inch pipes to supply and two 2" pipes as returns. The new boiler certainly heats up a lot quicker but I am wondering if I should have kept it as a gravity system. Most days it can take over 4 hours for the boiler to have to kick in again to heat the house but when it does it runs for close to 25 minutes in order to heat all the water needed for my cast iron rads. Could the reduced diameter of the circulating pump be limiting how quickly the water is flowing in the supply, maybe returning to gravity would be more effective, any thoughts, anyone.