We did that this winter. We already had the gas line in the house, which made it a lot easier. We got around six quotes and ended up paying $9,800 for them to remove the old boiler and oil tank, put in the new boiler, and fit in all the pipes, etc. (The cost of the boiler was included). Since we have steam radiators RISE wouldn’t reimburse any of the cost, but it’s definitely been worth it!