Seven SS Stars Pressurized Solar Water Heater 300 Liters (Stainless Steel) are popular high-quality solar water Heaters. They are made to last long and highly adaptive with both fresh and borehole water. They come with an inner tank made of stainless steel to work with the rising use of borehole water. It allows water to get in it by pressure but will only leave at the outlet through the convectional flow. To boost pressure at the delivery, a hot-water-compatible pump can be installed to suck hot water.