Why are Rinnai’s frost tolerant panels filled with water rather than glycol?
For frost prone areas, most manufacturers produce panels where the risers are filled with anti-freeze (glycol) rather than water to stop the panels freezing during winter. These systems are more expensive and have a shorter life span than water filled panels. Rinnai’s FTC panels have a spare half-size riser containing a spring which compresses in cold conditions, when…