Problems Identified with lengthy airvent pipes for solar water heaters:

Airvent pipe are too tall for solar water heater system size. Complicated to support tall Airvent pipe on the roof. Aesthetically not appealing. Airvent pipe generally will not stand vertical pipe will bend due to heat and or its own weight. Hot water stored in the Airvent gets cold soon and get discharged first each time into the flow of cold water in the hot water line which will reduce the efficiency of the system considerably. Hot water pipe leakage because of shaking Airvent pipe due to wind or birds sitting on it or its own weight with hot water. Airvent pipes are non-standard and need to be designed at the site. Airvent pipes are the attraction for monkeys on the roof tops of buildings and often break them by trying to climb or swing on the Airvent pipe resulting in draining of the entire water from SWH and cold water tank.

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