I have a new efm 520, and a honeywell L7224 (or something close to those numbers) aquistat. I set the differential on 25 degrees, low temp is set at 160. My pump only runs for about 4 minutes before the boiler tempurature drops to 135 and shuts it off. Then it takes about 8 minutes to recover back up to 160. This doesn't seem very efficient. I feel that the pump should stay on longer to pump water to all the radiators. I had the stoker set at 3 - 3.25, but I just jacked it up to 7-6 because my furnace ran for 5 hours this morning and my house wasn't heating up.
I don't have a large house, it's an old 2 story with about 1600 square feet of living space. I only have 9 radiators. The variable in this whole thing is my plumbing, for some reason there are 2 inch steel pipes in my basement, they are used for the main lines for the hot and return lines. I think they fill up with a lot of water then the pump shuts off and I have a lot of hot water sitting in those big pipes.
Any input would be great. Should I have a bigger pump? A better fire?