
Inhibited propylene glycol is recommended. Do not use automotive, ethylene glycol or undiluted antifreeze. Severe personal injury, death or substantial property damage can result. 50% solution provides protection to about — 30°F. Local codes may require back-flow preventer or actual disconnect from city water supply. Determine quantity according to system water content. Boiler water content is listed on back cover. Remember to add in expansion tank water content. Follow antifreeze manufactu