I am a first time home buyer that purchased a house that was built in the 1920's (in central NJ) that has a Weil Mclein gas-fired steam boiler from the early 90's that appears to be cracked and will need to be replaced. The BTU rating on the unit is 175,000 (input) and 142,00 (output). The house is roughly 1,400 Sq. Feet. I have looked at several websites that allow you to calculate the BTU's required based on the square footage and location of the house. The results that I get estimate that I need roughly 66,000 BTUs for my house.
Now that it is time to replace the boiler I am wondering if I should replace it with a comparable size to what I already have or would it be a better idea to go with something smaller and more in-line with the recommendation I got from the calculator? (some notes on the house: it was built in 1927 and retains most of the original plaster and has not been insulated with the exception of the bathrooms and kitchen that were recently remodeled. I am not sure if the lack of insulation allows for more heat-loss which could possibly explain the higher than normal BTU boiler)
Also I have priced out a few different brands but am not really sure which is a good choice to go with. I have looked at Weil Mclain (which is what I have and appears to be more expensive), also Williamson, Slant Fin and Burnham.
Any information or recommendations would be greatly appreciated. Thank you in advance!