I am currently using a Harman Mark III coal stove. I feed it nut coal. I usually burn three tons of coal for the year. It heats my 2000 square foot home without a problem. I have to carry the coal from the basement and it's kicking my butt carrying it upstairs.  At 63 years old my body doesn't like it.  I was thinking of getting a pellet stove to replace the coal stove.  Any suggestions for the pellet stove?  The Harman stove can put out a lot of heat which is hard to regulate the heat.  You can only turn the coal stove up so far before you use lose the fire. The stove has a top 6 inch exhaust  pipe and would need the same on a pellet stove.  I appreciate every ones help.