We have a 1915 home with the original ARCO Ideal gravity hot water boiler, converted from coal to gas. Knowing the old boiler is not very efficient, we've been considering replacing the old boiler with a newer unit. What recommendations do people have for this?

We've also considered going to a furnace and forced air system, because the cast iron radiators take up so much space. Because they are so bulky, previous owners removed the radiators in both the small master bedroom and bathroom. One heating contractor told us that if we removed the old cast iron radiators, we would actually decrease the value of the house. I'm curious what other people's opinions are on that point.

Of course, if we decide to get a new boiler, we would need to find smaller profile radiators to go in these rooms.

Thanks in advance for any recommendations!