In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
I've decided to replace my 60+ year old boiler instead of trying to fix it and have questions about the quotes I have so far.
Vendor 1 quoted a Slant Fin Sentry S-90 which has a DOE output of 76 MBTU/hr. He based his heat load on the length of cast baseboard that I have. This seemed kind of bogus to me.
Vendor 2 quoted a Peerless MIHII-03 which has a DOE output of 55 MBTU/hr. He based his heat load on square footage of the house.
The house is 1100 square feet with not very good wall insulation and lots of ceiling insulation. The piping uses diverter T's to supply each baseboard and there is only one zone.
I used the Slant Fin calculator and came up with 50.5 MBTU/hr using -17° outside and 70° inside (I'm in Minnesota).
The questions are:
Who is right on the heat load?
Which boiler will have the longest life?
Which boiler will require the least maintenance?
Which boiler company provides the best customer service?
Thanks for considering my questions.