Pa Dealer wrote:At four teeth your net btu's are 74670, at five teeth net btu's are 93340 not knowing the square feet of what you are trying to heat, and domestic coil demands five teeth 4 1/2 air is good for most situations.
Well Them BTU Numbers Will depend on what the coal is Putting out per lb Not all coal Put out the same amount of btu's
Per lb That will be more important then anything . And as you should already Know That them efm Number are way on the Conservative Side These units will put out way more btu's then they Advertise . Down here in this area coal will range
from 13.100 BTU's Per lb uP to 13.800 Per lb Now Take any of them and X that by the feed rate per lb going in to the
Furnace Your Gross output then subtract your heat loss thew the boiler /water and chimney Your net output So lets say we take off 2k per lb of coal for heat loss. At 4 teeth feed rate 10lbs Per Hr. say the coal is 13.500 btu per lb x 10lbs that is 135.000 btu going in Gross output. Now take off say 2K per lb 11.500 per lb x 10lbs per hr. coming out Net output will
be 115.000 BTU's Per hr.What efm Advertise is at 4 teeth feed rate 10 lbs per hr . is 85.870 btuh Gross output & Net output is 74.670 btuh So that means the coal that they tested was 8.587 BTU Per Lb Gross output going in and the Net output coming out was 7.467 BTU Per Lb. Now Anyone That knows Anthracite coal knows that them Numbers are not
even in a Anthracite btu's Scale or for that matter even Bituminous coal btu scale Them numbers are Sub Anthracite & Sub Bituminous btu scale and even Anthracite waste Products btuh scale .
I have asked EFM many times where them numbers or how they come up with them from and Never got a real Answer.
Now if you know first hand where & How they come up with them number Please let us know .
Not trying To be a Jackass but I would like to know . And I am sure many other's would want to know aswell .