All,
First of all this is a great forum, and I have read the detailed responses from the pros has brought me to the point where I can just get validation on my analysis.
Background - Moved in 2 yrs into this 5500 sqft house, has a 1992 installed original Peerless boiler (w 2 stickers 183K BTU and 209K, IBR 157 and 182) assuming running at 61-65% real efficiency Combustion efficiency measured (via testo) at 81-82%. No indirect water tank, water is heated through propane tankless, 3 Zones heat. Located in Somers NY 10589
Problem - Guzzling 1900+ and 2100+ gallons in past two winter seasons. Deducting 500 gallons (oil fired Bock replaced w tankless now in place). Still 1500+ gallons/year. Performed detailed heat loss through Slantfin ipad app w design temp 0 deg (120K w NYC design temp at 15) and home temp at 68. 140K heat loss. Looking to lower yearly oil costs .
1) How accurate is the Slantfin heat loss at 140 K (Hearth.com heat loss was 175K)
2) The Peerless boiler seems oversized - is it ? Option - 0.75GPH nozzle and downfire ? or replace
3) If replace Peerless with Biasi B-5(IBR 108) or B-6 (IBR 133) triple pass w higher AFUE - 20% oil savings ?
4) Install outdoor reset - 5-10% oil savings ?
Am I on the right track w this replacement
First of all this is a great forum, and I have read the detailed responses from the pros has brought me to the point where I can just get validation on my analysis.
Background - Moved in 2 yrs into this 5500 sqft house, has a 1992 installed original Peerless boiler (w 2 stickers 183K BTU and 209K, IBR 157 and 182) assuming running at 61-65% real efficiency Combustion efficiency measured (via testo) at 81-82%. No indirect water tank, water is heated through propane tankless, 3 Zones heat. Located in Somers NY 10589
Problem - Guzzling 1900+ and 2100+ gallons in past two winter seasons. Deducting 500 gallons (oil fired Bock replaced w tankless now in place). Still 1500+ gallons/year. Performed detailed heat loss through Slantfin ipad app w design temp 0 deg (120K w NYC design temp at 15) and home temp at 68. 140K heat loss. Looking to lower yearly oil costs .
1) How accurate is the Slantfin heat loss at 140 K (Hearth.com heat loss was 175K)
2) The Peerless boiler seems oversized - is it ? Option - 0.75GPH nozzle and downfire ? or replace
3) If replace Peerless with Biasi B-5(IBR 108) or B-6 (IBR 133) triple pass w higher AFUE - 20% oil savings ?
4) Install outdoor reset - 5-10% oil savings ?
Am I on the right track w this replacement