Koko wrote: I can crank the stove up to 600 degrees and then the room will maintain 69 but you need to tend the stove every 6 hours
There’s lots of room for error between what you said and what I’m going to say, but: If your stove holds 5 pounds of coal, and you are tending it every 6 hours, then you are burning at most 4 pounds in 6 hours, or 2/3 pound per hour. That’s about 8,000 BTU per hour in fuel. Adjust that by 65% efficiency, and you are heating with about 5,200 BTU per hour. Now, that is inadequate, so let’s make a wild guesstimate that you need 20,000 BTU per hour.
Koko wrote:… I am recently retired and doing some traveling so I can't cut the oil line just yet
No, I think Lee was speaking tongue-in-cheek. Even if you produce ALL your heat with coal, you will want to keep the oil for when you travel, or when you get the flu or break a leg and can’t haul coal, and so on.
Koko wrote:Exactly how I am thinking, big is better.
Be careful. The Keystoker HF inserts are NOT stoker stoves, and cannot be dialed back to as low a burn rate as the stokers. If my wild-ass guess above is accurate, and you truly need at most 20,000 BTU per hour, you would be running a 90K stove near its minimum in the coldest weather. And in warmer weather you would cook your family. Just for comparison, my kitchen/dining/bath total 400 square feet pretty well insulated. They are heated by a 10,000 BTU propane unit which RARELY has to be turned up to its maximum – only when the outside temperature is minus 20. You don’t say where you live, but I’m betting Maine is colder. I think you really need to do two things before you conclude that bigger is better: (1) do a careful heat-loss calculation to determine your needs, and (2) figure out how to get the heat distributed to all the rooms. I certainly don't mean that you should stay with your Morso - frankly, it sounds awful due to the short burn time. But don't jump from the icebox into the oven.