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Steam boiler and indirect hot water with radiant
New to the forum and wanted to get some advice.
I have an old house with a gas fired steam Weil Mclain boiler thats about 25 years old. There is also an addition on the house thats about 650-700 sq ft that has a separate Weil Mclain hot water boiler with 2 radiant zones and 1 hot water baseboard zone. Lastly I have a stand alone hot water heater thats about 14 years old and have 1/2 water lines through the house to the fixtures.
What I am looking to do is condense this all into one boiler. In total the two boilers and 1 hot water heater are about 350-400 btu and my gas bills are pretty high in the winter. I also know the hot water heater needs replacing and the steam boiler is giving me some trouble and will most likely need replacing and or addressing in the next few years anyway and lastly need the space to make the utility room more comfortable for the laundry machines that are in there.
A plumber / heating company came to my house and made the suggestion to rip out the hot water boiler all together, put a new steam boiler in and have an indirect water tank as well as the two radiant zones and one hot water base board zone off of the steam boiler with priority zone valves for the hot water, expansion tank, mixing valves etc.... I really like the idea because then I would have 1 boiler that services everything and would have way less btu / gas bill as well as more hot water with better recovery and more space for the laundry machines that are in there.
Does it seem like too much to have the two radiant zones, one hot water baseboard zone and indirect heater of the steam boiler? BTU wise it seems like I will be about 1/3 or less of the total on a a new steam boiler for the hot water zones and indirect hot water.
In general are there any caveats to this setup? I have read a bunch about in general using the steam boiler for the indirect hot water is not so great and will most likely have to replace pumps every few years because of the dirty water (maybe if the supply line is high enough to the water line it would be clean water and not be so bad) and i'm concerned that the radiant and baseboard getting the right temps etc...any suggestions to make sure the plumber is installing the system properly with certain things like y strainer etc...
I have read some things on the forum but not really directly relating to this situation so any advise would be appreciated or reasons not to go this route.