Aquasun 200 L Non-Pressurized Solar Water Heater The Aquasun 200 L non-pressurized is a gravity-fed solar water-heating system using evacuated vacuum tubes. Specification Details Brand Aquasun Capacity 200 litres System type Non-pressurized / gravity-fed Collector Evacuated vacuum tubes Tank Insulated hot-water storage tank Heating Solar thermal Assistant tank Included Controller Included Electric backup element Included/listed Magnesium rod Included Installation Roof-mounted Application Homes, apartments, offices, small businesses Typical users About 4–5 people Water pressure Low/gravity pressure