I have steam radiator heat now.
Question: Is it possible to convert to hot water heat?
Changing the boiler but leaving the rest.

 

First off a lot of contractors would advise against this action. If you or your contractor would be willing to do the legwork. I must also tell you there may be leaks in the system after converting. Here is a list of a few (and not limited to) things to check before you start a conversion.
1. Run steam pressure up to 10 psi and check for leaks.
2. Do a heat loss
3. Do a load calculation (sq ft of radiation)
4. In each room multply the load x 150 and compare result to heat loss for that room
5. If two pipe system make sure the return line is big enough
6. Make sure the return piping is big enough
7. If one pipe steam is there a plug in the bottom of the radiator for a return line.
8. Is there a way on a one pipe system to get a return line back to the boiler
9. Are the radiators connected at the top as they are at the bottom.
10. Is there a plug at the top of the radiator to move the air vent to the top.

This would also be a good time to consider zoning the system. Just don't get carried away. Too many zones are not a good idea unless you want to handle that as a seperate situation.

 

Anything is possible but the boiler has to be rated for hot water
up to 30psi.
I have new yorker steam boiler and it is dual rated. On the new yorker you can verify it by looking at the cast iron at the flue clean outs.
I think B&G gas a little info on their website that will allow you to do a partial hot water heat.

BOB

 

He says he is changing the boiler. Hooking a hot water heating zone to a steam boiler is a great way to heat additions and other rooms. The maximum you can go above the water line is 30'. Piping becomes critical when you go above the water line. The higher the more critical it becomes.