Racold's Omega MAX 8 solar water heater has a special Air Release Valve with Vacuum Release function that releases air and avoids vacuum build-up, thus protecting the life of the water tank. This solar water heater ensures dependable performance and high durability with its state-of-the-art features including PUF insulation, Multifunction Safety Valve, and Magnesium Sacrificial Anode thus protecting the tank from corrosion.