Its a 110 year old house, attached brick in Brooklyn NY. 2 stories. 20x55. 11 rooms, 10 radiators. Gas fired furnace. Used to be a steam system, but was converted to hot water, probably about 25 years ago, and supply and return lines are I think 3 inches. 2 separate closed loops, (one with the front radiators and one with the back radiators). Furnace towards the front in the basement.
This system has no circulator pump to move the hot water around, and thus the radiators on the rear loop, especially on the 2nd floor, tend not to get hot so easily, or stay hot for very long. I am sure a circulator pump will address this problem, but I still have a couple questions:
1 - At over $1000 installation, is it really worth it to install? I spend maybe about $1000 +/- all winter heating my house; If I want this investment to pay for itself in about 5 years or so, it would need to increase my efficiency a good 20%, no? Can I expect that?
2 - Contractor also offered to connect the 2 loops, so the pump would circulate through both of them. Do you think this is a good idea? We have no issues at all with the front loop, on either floor, so my feeling is that having the pump address BOTH loops would decrease its effectiveness.
Any insight appreciated, and many thanks