Gio said:
sugar said:
had to bump this so other stovemakers may respond to the air ratio claims which do make sense.
we got a replacement exhaust blower for an old 25pdvc & it was a different,bigger,more wattage motor. englander ASSURED US IT WAS TESTED & FINE BUT NOW WE WONDER IF THE EXTRA BLOW DIDNT HELP englander QUALIFY AS epa approved due to extra air & 35-1 ratio?....maggie
I`m puzzled. The dell Pont uses a very low 8/10-1 ratio , and exceeds EPA. Yet, you wonder if the new larger exhaust blower with 35-1 ratio helps your Englander qualify?
new 25pdvc qualifies for tax credit & claims 75% efficiency. i saw 1 last year & the burnpot had holes on the side different from my old burnpot. low air ratio seems good to me & i was hoping eng would write in with some facts for commparison. i wonder about vagaries but do know my new blower motor is bigger & draws more power...maggie[/quot
Maggie, I think you are confusing approved with certified. I think all pellet stoves are approved since they are exempt from having to be certified. The Englander 25pdv and 25pdvc are EPA approved , not EPA certified .Their 25 PAH and 25 EP models are EPA certified which means the particulate matter they give off is less than 7.5 grams per hr.(taken off the top of my head) However EPA certification is only a part of the sum needed to reach a high net efficiency. EPA certification only means the stove produces a clean burn (under certain tested conditions) However a less than optimal heat exchanger in a pellet stove can wipe out any gain made in a more efficient burn.
The Dell Point burn system (LOW AIR RATIO) makes a lot of sense (at least in theory) since those exhaust gases and heat get to stay in the stove longer and little heat escapes up the chimney as atested to and most probably due to the low air/fuel ratio.
It also must utilize a very good heat exchanger design and materials to be able to quickly absorb that heat on one side and extract (blow) it off the other side and out the front holes.