Since you still have the old oil boiler in the basement, did you ever consider putting in an outside cellar entrance. Then you could remove the old boiler, install the new boiler, take out ashes, or whatever you like. i know that this is an exspence, but I belive it would be worth it in the long run. If not you could pick up a chain fall (glorified block and tackle) at harbour freight or northern tool cheap enough, but you will need a good anchor point,the boiler you have chosen tips the scales at 975#. I installed one for a customer a fiew years back, we used planks and a truck, oh an a stone movers dolly. Good luck!