I'm in the middle of building a new house. I am doing a lot of the work myself but hiring sub contractors for parts I don't feel comfortable with like electrical, drywall, and for installing the eventual boiler. While I love doing as much work as possible myself, I have no interest in installing something that breathes fire without having some sort of training
Anyways, I would like to do radiant flooring. Since I would like to do the manual labor myself (installing the pex and transfer plates between the joist), and hire someone local to install the boiler, I had been looking at online companies first for materials and design.
Being the untrustful, research-it-myself kind of guy I attempted learning heat loss calculation myself because the number I was supplied with by a unnamed radiant company (from now on called: URC) looks wrong.
Project Assumptions: 0F outside, 70F inside.
Closed loop heating, supplied by boiler.
2x6 R22 walls, R49 ceiling, R3.2 floor with full unheated basement underneath.
1. There is 1,893 sqft of heated space
3. A total of 14 windows that have 399 BTU/h loss each per Andersen.
4. A sliding glass door with 1464 BTU/h loss (Almost cried when I found that out)
5. A fiberglass door with 467 BTU/h loss
These are the same numbers sent to the URC, along with a copy of the plans.
They came back at me with a total heat loss of 39757 BTU/h, and recommending a 100k BTU boiler.
My own calculations, done room by room, comes up with 23375 BTU/h and the RadiantWorks tool recommends a 51k BTU boiler.
Am I right to question the heat loss calc done by the URC?