My wife and I are considering replacing an older oil-fired boiler with one using propane (no natural gas where we live in Maine). I used a Weil-McLain worksheet to compute the heat loss for our home: between 75,000 and 80,000 btu/hr, depending on construction assumptions. We have Slant/Fin baseboard heating which I measured, and which should produce (approximately) 105,000 btu/[email protected]
180 degree water temp; 50,000 @ 130 degree temp.
The original Burnham oil boiler installed in the home was rated for 190,000 btu/hr. A local propane contractor has suggested installing a Bradford-White Brute 199 combi condensing boiler (199Mbh). The company also makes a Brute 140.
Given the heat loss assessments for the house, I asked the contractor if the Brute 199 was possibly oversized for the home’s needs. His response was that this boiler could modulate output as far as 10:1 down from full power. Again, given the heat loss analysis, would the Brute 140 seem to be a better fit?
Any perspective you could offer is appreciated!