Taco Mixing Valve setup with a Grundfos pump to a 4 Port PEX Radiant Manifold. This will allow you to run lower tempeatures to your radiant that what your boilers is putting out. In this case - we set the tempeature guage to 120 Degrees and if the boiler runs over this - then all you will get is max 120 Degrees. If the boiler is running lower tempeature - then the floor will get this lower tempeature.
When using any Mixing Valve you want to make sure that the pump is pulling water through the mixing valve. Mixing Valves are used frequently in PEX Radiant Heating Systems where lower water tempeature is needed.
List of materials needed for a project like this (Click Link below to Purchase Product and see more Information)
Radiant Heating (Secondary Loop with Mixing Valve)
Quantity 1 - Ball Valves for Heating Systems
Quantity 1 - Pump Flanges (Most Likely 3/4 Inch)
Quantity 1 - Heating Mixing Valves
Qunatity 1 - Hydronic Circulator Switching Relay
Qunatity 2 - Hydronic Heat Temperature Gauges
Qunatity X - Radiant Heating PEX Tubing - 1/2 Inch
Quantity X - Copper Fittings and Brass Fittings
Hydronic Heating Side (Distribution)
X = Various Amounts of Product needed - dependant on actual system