Glycol Based : Heat – Thaw – Cure

groundwerks_trailerHow Do they Work?

Hydronic, or glycol based heating systems, use boilers to heat fluids which are passed over concrete and frozen surfaces utilizing a hose and reel system.  When applied correctly, these heating systems can be very effective at removing ground frost and curing concrete even in frigid temperatures.

Basic method of use follows: Park the trailer close to the area you want heated and start up the boiler to begin heating the glycol. The boiler uses propane to heat the glycol and stores it in an insulated holding tank. Lay out your hose in a snake-like pattern with rows two feet to four feet apart depending on the amount of heat desired. Attach both ends of the hose to the distribution manifold on the trailer to form a continuous loop. Cover the area with insulating blankets to maximize the heating effect. Electric heat blankets like a Powerblanket or CureMAX Concrete Thermal Blanket work best and are much more effective than a standard blanket.  Then… simply open both the supply and return valves on the manifold to begin circulating the preheated glycol. The hose will quickly heat up and the insulating blanket traps the heat against the ground surface. Ideal for large area thawing and curing.  Amazing results!

We review the top models & welcome your input as to their effectiveness and reliability.


1. Thawzall:

2. GreenPower:

3. DryAir:

4. Crown Equipment:


Glycol based heating systems are utilized for the following applications: Utility digging, concrete curing, ice melting, frozen ground thawing, temporary heating, frost prevention, pre-fab curing, and the list goes on and on.

winter_utility_thawingWe’re happy to report that all the major brands do a very good job of thawing ground and removing frost.  Prices vary greatly depending on model and BTU desired.  The manifold systems used are also vastly different and we suggest you ask lots of questions before buying.  If large area curing and thawing is your business, one of these units will do the job… and in record time!

Several of those interviewed also cover their glycol hoses with tarps, insulated blankets, and even Powerblanket heated curing blankets.