KAA-4 February Tale of the Tape

nepacoal · Post by **nepacoal** » Sat. Feb. 29, 2020 7:46 pm

1691.50 lbs. coal fed into the Kaa-4 in February. 975 HDD's. I estimate 3 lbs. per day for DHW and the rest for home heating.

(1691.5-87)/975= 1.646 lbs. per HDD for home heating only.

HL - 220°
LL -165°
Dump - 225°
Timer - 52 sec every 10 min
Thermostat - 72.5°

1940's cape cod with decent windows (at just under 1,900 ft elevation). No insulation in brick/plaster walls, attic insulated with 12" fiberglass

Post by **Rob R.** » Sat. Feb. 29, 2020 8:17 pm

1500 lbs for me as of this morning. 1290 degree days. Pretty much inline with how much I have been burning so far.

This is the first winter I have tried running the timer at 2 minutes once per hour, and the boiler at a steady temperature. Other than a few weeks in January, I have run the boiler at 160-170 all winter. This is also the first winter with the zone on our first floor split into two zones.

lsayre · Post by **lsayre** » Sun. Mar. 01, 2020 5:01 am

I can't compute valid S-130 coal pounds per HDD for February, because I was also burning wood in the ComfortMax on 5 days during the month.

lsayre · Post by **lsayre** » Sun. Mar. 01, 2020 7:41 am

What can be said is that my initially projected 1.53 lbs. of coal burned per HDD was turned into 1.33 lbs. per HDD by burning wood for 5 out of 29 days. That plus I calculated 997.5 HDD's for the month.

That plus my best guess is that the wood stove is ~88% as efficient as the coal boiler.