If you have an old steam system, you may want to consider changing over to a water system also. When we replaced our boiler which was also ancient (it was coal converted to oil converted to gas) we looked into it. It was approximately $1,500-$2,000 more for the system which including laying the new pipes needed. The plus is that it does not require the big pipe in the basement. The unkown factor in it is the cost of repairing the walls which the plumber will not do.
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