Posted by randy leiser on February 09, 2000 at 12:23:32:
My newly contstructed 3300 sq. foot well insulated house has a heat loss of approx. 60,000 btu's per hour. The plumbing contractor installed a cg-7 150,00 net btu boiler with 250 ft. of baseboard spread over 4 zones. Based on my heat loss calculations I only need 120 feet of base board and approximately 75,000 btu's The boiler cycles constantly and uses 300 gallons of propane per month. Thanks to the advice I've received from this site I now know that the boiler is over sized.The contractor has agreed to change out the boiler to whatever I want (I am leaning towards a cg-4),however I have some concerns about the amount of baseboard it is serving. Would I be better off putting in say a 100,000 btu cg-5 or could the smaller cg-4 do the trick if I boost the temperature and close some dampers. There are no large loops in the system due to four zones.The largest btu draw is the entire first floor which accounts for about 29,000 btu's of heat loss.Sorry about the constant questions. Aside from the great advice I receive on this site I have received so much conflicting information regarding this house it has been mind boggling. Even though the heat loss was done three times with good programs, I still have boiler contractors and engineers giving me heat calculations close to 200,000 btu's on a house with r-21 walls, r-31 ceilings, and the best Anderson windows. I would love to talk to one expert in the central Jersey area to finally resolve this. Harold do you make house calls? I would gladly pay anyone who is knowlegdable in this feild to find the right solution!!