1 GAL (Red/Pink) Super Concentrate Heat Transfer Boiler Antifreeze
Boiler Antifreeze Red Concentrate 1 Gallon *NON-TOXIC
In order to get to -20º on your boiler, dilute with a 1 to 1 parts of distilled water.
For (-10º) on your boiler, dilute the antifreeze with a 1 to 2 parts distilled water.
All Hydronic Heating Manufacturers recommend -10 to -20 for optimum performance. You freeze point is determined by what negative temps your coach experiences.