Who do you suppose will get the call when the heating system doesn't work right?
What do expansion tanks, circulators, auto-air purgers, zone valves, elbows, ball valves and carpet have in common? They are all components of my radiant heating system.
I bet it's hard for many radiant contractors to think of carpet as an integral part of a complex network of pipes, valves and boiler(s) that make up a heating system.