Evacuated tube solar water heaters for residential buildings consist of evacuated tube solar collector and insulated hot water tank integrated together with the help of support frame.

Evacuated tube collector is a series of sealed two-layer glass tubes with a vacuum between inner and outer tube. The outer surface of inner tube is coated with highly absorptive selective coating and the vacuum between two tubes works as the best possible insulator. These features allow evacuated tube collectors to operate at higher efficiency compared to other solar collectors.

Evacuated tube solar water heaters for residential buildings are normally non-pressure type and work on thermosyphon principal. These types of SWHs are best suited for any house that has gravity-flow plumbing system.