This forum has been a real education. Thank you.
Converting from oil to natural gas heat & hot water from old 1950 American Standard furnace with tankless coil.
Cape style 1950 house located in northeast (Stamford, CT area) with original insulation and full unfinished basement.
Here are my measurements:
Original Double Hung Windows with storm windows: 15 windows
Total sq ft of windows: 225
sq ft of Exterior Walls: 1520
sq ft of Interior Walls: 1570
Total Length Radiators in ft. - fin type: 44 ft (photo attached)
Unfinished Basement (21’4” x28’6”) sq ft: 608
House sq ft: 1475
I've had a number of estimates suggesting Prestige Excellence, Baxi Luna Duo Tec series Model 40GA, and Navien - including a price range of $4,000 with the same Baxi Luna 40G.
No one has done heat loss analysis, although one, when I inquired, suggested I take above measurements and provide them to him (still waiting for him to get back to me).
Interested in a Modulating condensing boiler
Would appreciate some comments on above or alternate suggestions.
Thanks for taking the time to review this.