The 'rents are heating about 2200 sq ft...
Gambrel built in '78, two stories with a large ell...
Main part of the house stays 72* upstairs 68*...
The ell will cool to 65* due to the distance from the 503...
60 feet...
The basement is an additional 1000 sq ft...
That got cold due to the fact the boiler now only runs to heat DHW...
50*...
Installed my old Mark II and now that stays at 70*...
They love the 503 and no issues with the trim...
We run about 6500 heating degree days...
http://www.builditsolar.com/References/hddmap.htmAir circulation is the major factor in heating a house...
Good air movement and the house heats evenly...
The 'rents were a bit hesitant about coal burning at first...
But now they are 'all in'...
The 503 burns easy and they shake/add coal every 12 hrs...
When I offered the Mark II for their cold basement they jumped on it...
I upgraded to a larger stove DS Machine Stove Basement #4...
130,000 btu/hr vs. the 72,000 from the Mark II...
The 503 puts has an output of about 70,000 btu/hr...
If you have a large outside flue I recommend using an insulated flue liner...
Hitzer install manual has the max flue area as 85 sq inches before you need a liner...
A 12x12 flue has 144 sq inches, so if the flue is larger than 8x8 you should install an insulated liner...
Do a search for 503 in the hand fired section, lots of info...