STAR BRITE Propylene Glycol Boiler Antifreeze 1 Gallon — Premium -100°F Protection, Corrosion Inhibitors

STAR BRITE Premium -100° Boiler System Antifreeze is a propylene-glycol heating and cooling fluid formulated with corrosion inhibitors to protect boiler and hydronic systems down to -100°F when used full strength.

This one-gallon, ready-for-use solution from STAR BRITE is designed for closed-loop boilers, hydronic heaters, and solar thermal systems where safer handling and environmental considerations matter. Formulated without ethanol and manufactured in the United States, the product uses propylene glycol — a GRAS-rated ingredient — and includes additives to reduce corrosion and support efficient heat transfer. It may be diluted with distilled or deionized water to reach the frost protection needed for your application; verify concentrations with a calibrated propylene glycol refractometer.

How does this antifreeze protect my boiler and related components?

The STAR BRITE formula contains premium corrosion inhibitors that form a protective film on metal surfaces, lowering oxidation and scale formation inside pumps, heat exchangers, and radiators. By preventing corrosion, the fluid helps maintain system efficiency and lowers long-term repair risk, especially in closed and solar systems where water chemistry can be critical.

• Contains corrosion-inhibiting additives for metal protection
• Reduces scale and oxidation inside heat-transfer components
• Supports consistent heat transfer for reliable system performance

What freeze protection and thermal performance can I expect?

At full strength, this propylene glycol solution provides burst protection down to -100°F (-73°C), suitable for extreme cold conditions. Dilution will change the freeze point, so use a refractometer to calculate the correct propylene glycol percentage for your location and system requirements to balance protection and viscosity.

• Full-strength protection to -100°F (-73°C)
• Dilutable to custom freeze points with distilled or deionized water
• Maintains effective heat transfer for hydronic and boiler systems

How should I use and measure this product safely in my heating system?

This product is not a concentrate in the sense of needing chemical activation, but many installations require dilution; always follow your equipment manufacturer’s instructions. For accurate mixture and freeze-point verification, a calibrated propylene glycol coolant/antifreeze refractometer is recommended, and only distilled or deionized water should be used to avoid mineral deposits.

• Follow system manufacturer directions for fill and concentration
• Use distilled or deionized water if dilution is required
• Check solution percentage with a calibrated PG refractometer

Is this product environmentally safer and where is it made?

Propylene glycol — the primary ingredient — is designated Generally Recognized As Safe (GRAS) by the FDA for certain food-contact contexts, making it a preferred choice when spills or leaks could lead to environmental exposure. STAR BRITE’s formula is ethanol-free and produced in the USA, aligning with buyers looking for domestic manufacture and lower volatility additives.

• Propylene glycol base with GRAS recognition in defined uses
• Ethanol-free formulation to support system longevity
• Manufactured in the United States for quality control

Who this is for: STAR BRITE Premium -100° Boiler System Antifreeze is intended for homeowners, RV and marine owners, HVAC technicians, and solar-thermal installers who need a reliable, lower-toxicity heat-transfer fluid for closed-loop boilers, hydronic heating, Aqua-Hot/Hydro-Hot systems, and solar systems. If you require deep-freeze protection, corrosion inhibitors, and a US-made, ethanol-free formulation that can be adjusted to local freeze-point needs, this product is a practical choice. Always consult your system manual and test concentrations with appropriate tools before putting the system into service.