Boiler upgrade recommendation?
I’m currently looking to upgrade my old boiler as it developed a small crack and is leaking. My current boiler is a P-468U-wt (151,000 btu/hr) Weil-McClain oil-fired boiler with a 40-gallon hot water holding tank.
I’m getting two different suggestions from two of my plumbers and would love some input on their recommendations. One recommends replacing it with an Energy Kinetics System 2000 and the other one is suggesting a Navien Combi-boiler.
I do have propane piped into my house so that wouldn’t be an extra cost. I also like the fact that the Navien is sealed combustion as my house is pretty tight (3ACH50).
Also, I believe my current boiler is oversized and am planning on getting a heat-loss calculation done but would like to know if anybody can recommend software that would enable me to do a basic load calculation. I’ve listed details about my house below but if I’m missing any pertinent information, please let me know and I’ll be happy to post it. Any input would be greatly appreciated. Thanks!
Location: Norwalk, CT (Zone 5)
Ranch style house
Currently there are two heating zones:
100ft of baseboard on main floor and 30ft of baseboard in the basement.
MAIN FLOOR – 1325sqft
Windows (double pane):
North – 44sqft
South – 32sqft
East – 90
East – 21sqft
South – 21sqft
BASEMENT – 748sqft:
Windows (double pane)
North – 8sqft
South – 8sqft
West – 16sqft
r13 fiberglass in walls on main floor
r38 open cell on attic roof
r10 Closed cell foam on walls and rim joist in basement
r28 Open cell foam in garage ceiling (750sqft of the main floor).
GBA Detail Library
A collection of one thousand construction details organized by climate and house part