Hi, my 1952 home has the original oil-burning furnace. We have a gas line in the house so we are going to convert to gas heating. We also have a gas water heater that's nearing the end of its life. Two plumbers suggested a combi gas water heater/furnace, and one plumber recommended separate units. Does anyone here have recommendations about what to put in? The separate units are a Crown Mega Store Indirect Water Heater and Viessman Vitodens 200 series high efficiency wall hung boiler. The combi systems were HTP Combi Unit or IBC Combi Unit.
It's a one-bathroom house but we plan to add a bathroom in the hopefully near future. I've heard that the Combi systems aren't great for producing enough hot water at a time.