Clearance required in residential settings is for service. While there may be no code required minimum, I would allow 24 inches minimum to get behind/around the boiler if you have the room. Ash pan removal is the key space requirement. This you would probably want 36 or more inches. Keystoker makes there boilers with the ash door on the right or left hand side as ordered to accomodate different installations. The AA and AHS has doors on both sides.tony17112acst wrote:Any info on this? Thanks again! -TonyBTW, are there clearance requirements on on coal boilers against cinder block walls in the basement? Every owner's manual I read just lists clearance to combustibles. Thank you.
Also, check on building permit requirements. You can ask your building code enforcement officer if you have to involve him.