I have a chimney cleaner coming tomorrow to inspect my existing chimney and give me a quote on a SS liner install. Hoping to then purchase a gasifier for my basement and move the existing oil boiler to another location for power venting. I will have to bring the new wood boiler into the basement through bulkhead/Bilco doors and down 3 concrete steps. The entrance has clearance of 67"X38" which I think should not be a problem? My main concern is the overhead clearance in the basement which is only 74". With this low overhead are there certain brands I need to eliminate? I seem to recall reading some boilers need overhead clearance for cleaning/maintenance?