We have a 50yo ranch that has a newer natural gas boiler with baseboard heaters throughout the house. I attached a simplified diagram for how our system is plumbed.
I are redoing our bathroom down to the studs and I would like to put some type of in/underfloor heating in rather than the baseboard radiator.
I would likely use warmboard or a similar product, or staple up plates below the sub floor for the actualy heat transfer.
What I am more concerned about is the actual water flow, and if there are potential issues with just replacing this unit. For instance, I think I would have to install a bleed valve above the floor level to purge the air from the loop... I'm sure there are other concerns.