I was wondering if someone might be able to help me figure out what I’m missing looking at the ratings for these 3 boilers from Burnham/US Boiler: ES2, Series 3, and ESC.
ES24: 105MBTUH input, 89MBTUH DOE output, 3 gal water content, 354lb shipping weight
304: 105MBTUH input, 89MBTUH DOE output, 3 gal water content, 354lb shipping weight
ESC4: 91MBTUH input, 78MBTUH DOE output, 3 gal water content, 350lb shipping weight
Looking at the I&O manuals, all 3 boilers use the same part number for the heat exchangers, the gas valve, gas manifold, burner orifice, main burner.
It really looks like these boilers are all very similar with some differences related to exhaust venting and combustion air. But I can’t figure out why that would change the input rating significantly between the ESC and the others.
I’m asking about this as I’m about to have an ESC installed, and have been on the fence between an ESC4 and an ESC5. My heat loss on slant/fin (70deg interior, 0deg exterior) was 80MBTUH. Measured gas consumption over the winter extrapolated pretty well out to 80MBTUH. I’ve been leaning towards the 4, but undersizing is a concern. The 5 seems pretty oversized though. If the ESC4 is actually a 105MBTUH input/89MBTUH output, then I’d be comfortable with the margin I have relative to the heat loss, especially as I hope to have some additional insulation work done at some point.
Thanks!
ES24: 105MBTUH input, 89MBTUH DOE output, 3 gal water content, 354lb shipping weight
304: 105MBTUH input, 89MBTUH DOE output, 3 gal water content, 354lb shipping weight
ESC4: 91MBTUH input, 78MBTUH DOE output, 3 gal water content, 350lb shipping weight
Looking at the I&O manuals, all 3 boilers use the same part number for the heat exchangers, the gas valve, gas manifold, burner orifice, main burner.
It really looks like these boilers are all very similar with some differences related to exhaust venting and combustion air. But I can’t figure out why that would change the input rating significantly between the ESC and the others.
I’m asking about this as I’m about to have an ESC installed, and have been on the fence between an ESC4 and an ESC5. My heat loss on slant/fin (70deg interior, 0deg exterior) was 80MBTUH. Measured gas consumption over the winter extrapolated pretty well out to 80MBTUH. I’ve been leaning towards the 4, but undersizing is a concern. The 5 seems pretty oversized though. If the ESC4 is actually a 105MBTUH input/89MBTUH output, then I’d be comfortable with the margin I have relative to the heat loss, especially as I hope to have some additional insulation work done at some point.
Thanks!