Welcome! Here are the website rules, as well as some tips for using this forum.
Need help in sizing Lochinvar Boiler
I'm in a middle of remodeling project.
My house is 3200 sq ft. Spray foam insulated, brand new windows.
First floor is getting radiant heat - 1050 sq ft.
3 bathrooms upstairs (about 350 sq ft) are also getting radiant heat.
Middle (living room ) and second floors are getting hydronic forsed air from 2 coils (one in attic, the other one in a garage).
I'm planning to install wall mount Lochinvar Knight unit with Lochinvar 80Gal indirect water heater and set it up in 4 heating zones with 5th zone for domestic water.
Plumbers I spoke to tend to throw large numbers at me...between 150,000 and 175,000BTU.
I have a feeling that WHN-110 (110,000 BTU input; 89,000 BTU output) will be just right.
Could someone help me to get correct boiler size? Am I wrong? Am I right?
Your help will be greatly appreciated!