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Mixing Valve, Pump & PEX Manifold for lower Temp Radiant Systems

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.

Taco Mixing Valve setup with a Grundfos pump to a 4 Port PEX Radiant Manifold

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 - Cast Iron Heating Pumps  (Size Depends on System with flow check)

Quantity 1 - Pump Flanges (Most Likely 3/4 Inch)

Quantity 1 - Heating Mixing Valves

Qunatity 1 - Hydronic Circulator Switching Relay

Qunatity 1 - Radiant Heating 4 Port Manifold with 1/2 Inch Adapters

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)

Quantity X - Hydronic Radiant Heat Pex Tubing (Depends on Systyem)

Quantity X - Hydronic Radiators and Convectors (Depends on System)

Quantity X - Smith Heating Edge Environmental Hydronic Baseboard Heaters


X = Various Amounts of Product needed - dependant on actual system