Non-Toxic HVAC Anti-Freeze Solution HYDRO-THERM™ PG100 is a propylene glycol based heat transfer fluid designed for maximum freeze protection for hydronic heating, chillers, solar heating, and other closed-loop water systems. HYDRO-THERM™ PG100’s food-grade inhibitor package and GRAS (generally regarded as safe) ingredients make it a superior choice over ethylene glycol based fluids.

• Unique testing procedure
• PG100 Test Strips determine adequate freeze & corrosion protection
• 70% propylene glycol based heat transfer fluid for maximum freeze protection
• Contains a food-grade corrosion inhibitor package specially designed for HVAC systems
• Burst protection to -100°F (-73°C)
• Freeze protection to – 60°F (-51°C)