Navigating These Challenging Times Together

First, we want to thank you again for your continued support during this difficult time. Like everyone else we are just trying to take things one day at a time and get through this the best we can. We'd like to share some information with you to help you stay updated with what's going on at Hatchet Hardware in the coming days.

Store Hours:
As an essential business, our shops will continue to stay open. Our teams are working incredibly hard to be here for our communities in any way that we can so please be courteous. You can find our current store hours on the locations page:
Feel free to call the shops ahead to make sure we have whatever you need before coming out and please remember that you can shop online at at any time.

Steps We're Taking:
Our offices are all currently set up to work from home to help stop the spread of COVID-19. At our warehouse and shops, we have increased efforts to disinfect high-touch and high-trafficked areas throughout the day and increased daily cleaning routines. We are also making sure all employees have up-to-date information on how to stay healthy and what preventative measures should be taken and the ability to stay home if they are feeling unwell.

You may experience delays in shipping as we are taking the necessary precautions to protect you and our team. We are still working hard to get in-stock items shipped within 24 hours. Few items may temporarily have longer fulfillment times.

Customer Service:
Our customer service team is working hard to help all customers as quickly as possible. Due to technical difficulties and a higher volume of calls you may experience interruptions. In the event this occurs, please email us at or message our chat here on the site. We apologize for any inconvenience and thank for your continued support and understanding.

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Hercules Cryo-Tek-100 Anti-Freeze Heating & Cooling System, 5 Gal, Red

Regular price $149.99

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A blend of virgin (not recycled) propylene glycol and high purity Triple Protection additives, formulated for use in closed loop hydronic heating and cooling systems. Cryo-tek can also be used in radiant tube heating systems, most solar heating systems and geothermal loops. Hercules’ exclusive Triple Protection formula stabilizes pH to prevent acid corrosion, chelates hard water minerals and inhibits the formation of scale and sediment. These components work together to keep the system clean and operating efficiently by eliminating system deposits, improving heat transfer and minimizing wear to moving parts and seals. Cryo-tek is compatible with PEX and elastomeric radiant tubing, commonly used materials for seals and bushings and provides corrosion protection for cast iron, steel, copper, brass and solder. Cryo-tek has not been tested for use in systems containing CPVC plastic. Standard cryo-tek products should not be used in systems containing aluminum. Cryo-tek -100/AL is available for aluminum systems. Cryo-tek should not be used in systems with galvanized piping as the zinc coating will be dissolved. Cryo-tek is a 94-98% efficient heat transfer solution in most application dilutions. It has a lower freeze point and higher boiling point than water and is non-flammable, odorless, non-toxic, nonirritating and compatible with Hercules boiler stop leaks and heating system cleaner products.

Cryo-tek -100: Contains virgin (not recycled) propylene glycol with Triple Protection corrosion inhibitor, pre-mixed ready to use formulation. Certified Performance: Freeze Protection Down to -70°F /-57°C, Pumpable Down to -80°F / -62°C, and Burst Protection Down to -100°F / -73°C. Cryo-tek -100 can be diluted with water for less severe conditions.


  • Size: 5 Gallon
  • Contains virgin (not recycled) propylene glycol with triple protection corrosion inhibitor.
  • Pre-mixed, ready-to-use formulation.
  • Maximum freeze protection for hydronic heating, cooling, portable water systems, closed loop solar systems.
  • Home and industrial use.
  • Non-toxic, corrosion resistance.

Approvals And Listings:

The virgin propylene glycol used in cryo-tek is "GRAS" (Generally Recognized As Safe) for incidental contact with food.

Specific Uses:

Use any cryo-tek Anti-Freeze in hydronic closed loop heating and cooling systems, solar heating systems, and general plumbing systems that require freeze protection. Operating Temperature Range for Closed System: Up to 250°F.

Specific Applications:

Add any cryo-tek product to protect pipes from freezing and bursting. Also prevents freeze-ups in chiller systems, recreational vehicles, seasonal homes, mobile homes, trailers, boats, sprinkler systems, and industrial use.

Physical Properties:

  • pH: 9.0 - 9.5
  • Density lb/gal. 60°F - 65°F: 8.78 lb./ gallon
  • Specific Gravity 60°F - 65°F: 1.054
  • Specific Heat BTU/lb°F @ 160° F: 0.843
  • Boiling Point: 230°F / 110°C
  • Appearance and color: Red liquid. Odorless.


49.0 lb