Going to keep tweaking the basement stove but I don't think it's going to cut the mustard, even with surface temp 400-500, basement only gets up to around 75 (with blower going into basement; corners are way colder) or less(when blower going into ducts), 1st floor ranges from 73 (no duct connections made, in kitchen where stairwell is) to 63 (with duct connection, in living room), 2nd floor around 58. And with lows only in the mid 20s.
(The 2nd floor being that much cooler is partly due to no return air connections upstairs. Working on adding floor grates +/- ducting on 2nd floor, to let the cold air fall down so warm air can go up the stairs. Right now, even with the oil furnace, there's a definite 'line' where cold starts and warm stops, going up the stairs.)
This house has in the basement a big Riteway furnace but it is scrap, firebox rotten, grates warped, not fixable. I don't know how they got it in the basement, maybe when the wall was open when building the chimney.
Any suggestions on how to get more heat out of the stove are welcome but I think it's running too close to the limit already. I suspect the answer to being warm is a proper furnace. I was really hoping not to have to go that route due to expense and poor basement access, but if that is what it takes to be warm, so be it. Will be burning at least some wood. Construction season is about done, and funds are probably too tight, to add a basement hatchway this fall, but that could happen next year.
Looking at the Clayton 1600, Hitzer 82fa, Harman. And whatever may pop up on the used market. The Yukon dual-fuel won't fit down the stairs, there was one for sale awhile back for a super price but per manufact. the smallest it can get without a blue-tip wrench is about 31". 2" wider than header to sill distance in the stairwell
If can't find a good deal or true project cost too high, will just keep the stove going this winter as supplement, and go all-out next year. Anything to burn less oil eh.