Boiler replacement radiant heat in garage

Wirenut

Preferred replacement boiler choice for garage with radiant floor running glycol, load 46,000 BTUH design T 122 F, no other load. Also brand of glycol preferred
Wirenut

GroundUp

Where did the 122F come from? Seems mighty high for a garage. I'm really liking the HTP UFT-80W for jobs like this, and any inhibited propylene glycol will do the trick but I use either Cryo-Tek or PlumbGuard typically. They've both done me very well. How big is the garage and what's the tube spacing and diameter? All one zone?

Solid_Fuel_Man

I keep a detached radiant shop 60F with 100 degree water when its below zero. Two 10x14 foot overhead doors, 2500 square feet.

Tubing (done by someone else 20 years ago) is 1/2" 12"OC. There was a chimney and oil boiler where that manifolds are. We demoed it all.

Wirenut

122 degree supply T came from heat loss by uponor dist

hot_rod

If it has a wide tube spacing that temperature may be required to meet the load.

Use a good brand glycol, for the best inhibitor protection. DowFrost, Rhomar, Nobel, Hercules are a few. 35- 40% should be adequate.

Buy the pre-mix so you do not destroy the fluid with hard or high TDS job site water. It really should blend with DI or RO water.