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.
Using a Water Heater for Space Heating
What you must know!!!