royall 8150?

I have a Charmaster wood/oil forced air unit bought back in "83". Still going strong, love that 30" firebox. Only thing I've ever had to do with it is change out some oil gun components.

Better to go smaller rather than bigger with that unit. They do NOT like to idle and will produce incredible amounts of creosote if not run fairly hard. Storage would be highly advisable to help reduce (notice I did not say eliminate) the tar problem. Here's a picture of a 6150 we installed last year for a guy in a 2,500 sq ft full log home. He cannot run the thing unless temps are down to the teens without plugging his chimney every other week. Anything above 20* and it just idles too much.

Heaterman's observations reflect my experience with a 6150.

I have a royall 6526 that is basically an older 6150. To get away from the creosote problem I put a small sliding draft door in the ash door. If you do that you MUST have an extra aquastat that will kick on the blower (if you have a water to air heat exchanger) to keep the boiler from getting too hot. I cannot load it full when it's warm outside but by adding wood depending on what the outside temp is up I can keep the house within a few degrees. It's not original but it works..