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Boiler replacement sizing help!!
Due to issues with existing boiler i am trying to get a good understanding of a replacement solution. I have received 6 quotes from 3 oil companies and 3 heating/plumbing companies and the size of the boiler is all over the place and im unsure which is accurately sized. My goal like any, is lowest cost while using as less oil as possible.
What i have:
1. Side Power vented, no chimney
2. New Yorker APH_790
3. Appears to be D.O.E. 120 MBH
4. No water heater as boiler provides domestic and heat
5. 112 linear ft of 7.5" baseboard forced hot water
6. 1300 sq ft split amongst 2 zones 1st and 2nd fl. Boiler in basement with no heat/zone
7. Rhode island weather with 4 people in house
8. Oil fuel with Beckett burner
What i am looking for is sizing of boiler to support:
1. High efficiency boiler supporting exisitng details above with direct vent kit.
2. Separate in direct hot water heater
I figure with the 112 ft of baseboard at 600 BTU per foot and some addition loss to be at 70,000 but i dont know what to add for the indirect.
Any idea of using this data what is more accurately sizing should be? I have quotes with 87,000 BTU up to 114,000 BTU.
Please help our solution is dying any day now.