You Might not have to 3 teeth is 7.5 lbs a hr 4 is 10 lbs per hr 5 is 12.5 lbs per hr 6 is 15 lbs per hr
7 is 17.5 lbs per hr 8 is 20 lbs per hr 9 is 22.5 lbs per hr 10 is 25 lbs per hr
It will depend on your house at the heat loss it has. You will know if the stoker starts to run more often to keep up with
the heat demand and how much coal you will be using. Also how many btu's per lb that is in the coal that you are using .
The only true way to know how much coal / btu's you will need is to do a heat loss calculation on your house .
You can get a ruff idea if you used oil before take the amount of oil that you used to heat with in the passed .
180 gals of oil = 1 ton of coal ruffled it should give you how many tons of coal you will need to heat with .
Also if you have to bump the Aquastat up more you might want increase the feed rate to maintain the water temp you want. There is Probably a hundred other factors that go into this but these are a few that might help you.
The Stoker will tell you just by how much more it has to run to keep up & how much coal you are going threw.