Email: - Phone: 610-666-1220


Glycol Make-Up Units

Glycol make-up units are designed to maintain minimum pressure levels in systems that may have small leaks.  The systems are completely automatic and operate as needed to add water or water-glycol solution to a closed loop heating, chilled water, snowmelt, or radiant heat system.  The water-glycol solution is contained in a polyethylene holding tank and a pressure switch controls the flow of glycol solution to the system.  A low level alarm safety switch safely shuts down the pump when the solution drops to the minimum fill level.

We offer several styles of make-up systems, shown below.  We are also able to engineer custom glycol units to meet any specific needs you may have.

Submittal Sheets

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The John Wood Company, LLC

Phone (610) 666-1220
Fax (610) 666-0193
Toll Free (800) 537-5581

Remit To:

The John Wood Company
PO Box 644250
Pittsburgh, PA 15264

Mail to:

The John Wood Company
PO Box 364
98 Highland Avenue
Oaks, PA 19456

Ship To:

The John Wood Company
Highland Business Park
98 Highland Avenue
Oaks, PA 19456-1052

NOTE: We are NOT affiliated with the John Wood Water Heater Company of Canada. They may be contacted at 1-888-599-2837, e-mail at or at