Redren Energy Pvt. Ltd. Offers Solar Water Heater with Industrial Water Heating System. Redren Energy Pvt. Ltd. Manufactures Solar Thermal Panels. The Solar Water Heater with Industrial Water Heating System is known to have the fastest repayment of investment. It is a flat plate solar water heating system works on thermosyphone cycle. The material, it`s made of, is selected such that its performance is not affected over long time. The Solar Water Heater comes with Thermosyphone and forced circulation systems. The Solar Water Heater with Industrial Water Heating System is custom-made to suit specific applications.