Material choices depend on the type of heat source you use for your system.

• Select None, please include a tankless heater for radiant system if this is a new system or you are interested in replacing your water heater or boiler with a high efficiency tankless water heater or boiler.
• Select Existing cast iron boiler if you have an existing boiler with a cast iron heat exchanger.
• Select Existing non-cast iron boiler if you have an existing boiler with a copper or stainless steel heat exchanger.
• Select Existing water heater if you have an existing gas fired or electric water heater being used as a closed loop hydronic heat source.

Note: Thinking of installing an Open System? (That is where you will use your domestic hot water to heat your radiant floor.) Please read the document below.
Open Systems and Water Heaters (270KB)
What you must know!!!