... best density of 40kg/m3 Available sizes: 16,18,20,24,30,36 tubes with capacity 135L ... OEM available, The type you can choose : 15, 18, 20, 24, 30 tubes7.It is applied in various ... CostsBy installing a Solar water heating system, a typical household can meet 50 to 80 percent of their ... household's hot water needs. Proven Efficient TechnologyCurrently there are more than 800,000,000 Solar Water Heater units ...