Pulse,
The design heat loss on my energy audit, certified is 1.83 BTU/hr/ft3...my house is 3250 sq ft,
10 foot ceilings main floor, 15 foot ceilings second floor.For my zone the design heat loss temp is -13 degrees F, this equates to 94,000 btu/hr for the volume. My shop is close to 900 sq ft so add another few thousand btu/hr, 12 foot ceilings....then throw in a few for my DHW....add windy cold north winds, I have a high percentage of wall area in glazing, floor to ceiling windows etc...(views to the lake). House is very well insulated, to R2000 builidng stds. with good vapor barrier etc...I am exposed on lakefront...
So, pretty easy to get to 100k/hr....in fact on some days would be more....
What you dont know is that I have radiant in floor everywhere...so the low temps needed for high output of the radiant serves me very well...as does the large volume capacity of the 6048.
I do not go thru 20 -25 cord...8 to 10 this year...prolly closer to 10 as we still have a good 6 to 8 weeks to go...
My Hx by the way is rated up to 150,000 btu/hr
My wife also has bad arthritis...we keep the temp set at 25 degrees C downstairs and 22 degrees upstairs, (sleeping area), thats around 75 degrees F....house is always very toasty
There is something wrong with the OP setup for sure
Mike