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Anti Freeze

Glycol is the most common anti freeze used with the PM Bowle boiler systems. Since the PM Bowle boiler is built for outdoor installation, it is highly recommended to use glycol in the heating system. The concentration should go around 50% glycol, 50% pure water.

Choosing Propylen glycol is justified by its environmental friendly characteristic. Ethylen glycol also works fine.

Note:

Never fill up a system with a higher percentage then describe above. Reasons are:

1- At a very low temperature, a high concentration of glycol as the tendency to get thicker. Then the system's pump will required more power to run the liquid untill it gets warm.

2- At 100% glycol concentration, this one can freeze.

A good mixing of glycol helps to have a more stable heating temperature.