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Baseboard heating loop on 1/2" pipe
I recently had a new gas boiler and HW tank installed to replace and old oil furnace. At the same time, the plumber took out the monoflow system and connected the existing baseboards in a close loop so I could more easily finish the basement in future. New boiler is a Vitodens 100 and heating loop is set to max temp of 176F.
I am finding however that the house (single family ranch) really is taking a long time to get warmed up. On a cold day in MA, it can take 3+ hours to lift the temperature of the house by 4 degrees F to 68. We have had walls and ceiling insulated by Mass Save and windows are all newish double glazed units.
I have done a heat calculation for reach room and the existing baseboard sizes seem to stack up with the required BTU output. Total BTU requirement being 43,000 and the existing rads and kickspace heaters on paper able to produce 45,500. I mentioned to the plumber and he just suggested ripping out the baseboard and using the a/c blower for heating. Not something I am keen to do.
When he replaced the monoflow, he ran 3/4" pipe to the first baseboard radiator and then dropped to the existing 1/2" which remains 1/2" for the rest of the loop through all the 1/2" baseboards back to the heat exchanger where it again returns to 3/4". There is a total of 62' of exposed baseboard element plus two KS2010 kickspace heaters in the heating loop. The two kickspace heaters are in the same loop before the first baseboard radiator and are connected to the loop using 3/4" diverter tee. After these kickspace heaters, the rest of the loop is 1/2"
Would I see much benefit in having the entire heating loop and baseboard radiators increased from 1/2" to 3/4"? Or any other suggestions to improve the heating?