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What is the proper way to size the boiler for a forced air with coils system.
I have the job of plumbing the boiler with supply and return piping to four coils. The HVAC person has split this house into four zones. Each zone has what appears to be the same 3/4" coil in the duct work. The customer also wants a BUDERUS GB boiler regardless if he needs it or not. The HVAC person has told the customer he needs a 150,000 BTU boiler. I am sure he pulled that number out of the air. I have plumbed these type of systems before using basic on off boilers with high limits set to 180 degrees and figuring 40,000 btu's per 3/4" coil. They have worked fine, but now i need to know the proper way to figure my actual loads. Thanks for any input.