Sunrise Solar Pvt. Ltd. Manufactures High Pressure Solar Water Heater. Sunrise Solar Pvt. Ltd. Is an ISO 9001:2000 and ISO 14001 accredited company. The High Pressure Solar Water Heater works with high pressure [up to 5kg working pressure]. It is made of Salem stainless steel--1.50mm thick with the special design which will take constant pressure. It is mainly used for industrial purposes.