Return water too cold from barn floor loops!

[Heath250r]

Is there a mixing valve to raise the water temp above 140 before returning to the boiler?I shut off the floor heat and plumbed in a heat exchanger for the time being.My water was returning to the boiler at 75 deg through the floor.Definately new to slab heat.Thanks for any advice!

 

[Smoothride]

Caleffi ThermoProtec, Danfos ESBE, or ThermoVar LK823 are what you need for boiler protection. Also consider a buffer tank or hydraulic separate and a constant flow pump on the radiant.

 

[Heath250r]

Caleffi ThermoProtec, Danfos ESBE, or ThermoVar LK823 are what you need for boiler protection. Also consider a buffer tank or hydraulic separate and a constant flow pump on the radiant.

Thanks so much, I’m researching everything right now and learning a lot!