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Indirect and boiler sizing
Can someone help me with a reference for indirect sizing. My project has a total heating load of 128,000 btu across 11 zones. I had specified a Lochinvar whn-155 boiler coupled to a triangle Tube SME 120 multi energy tank. We were planning to use the outer shell of the SME as a buffer tank for the radiant micro loads (each bath room is zoned) and using outdoor reset from the tank with a Taco I valve for reset. the inner (domestic) tank is 105 gallons, jacketed with 66 gallons of heating water. A consulting engineer said that my radiant boiler sizing was correct but stated that my load for domestic hot water was 150,000btu additional for the 4 bathrooms. I know I have to account for the Domestic load but that is a fractional load right? I know on the coldest design day the boiler will be running a 75% of capacity all day load but nobody takes a shower in all 4 bathrooms all day long on the coldest day of the year. His specification will have my boiler 100% oversized. Any help would be appreciated.