Solar Water Heaters

Solar water heating is the most efficient way to warm up water at home, since this technology helps produce hot water when you need the most and it uses no electricity at all! The sun’s rays collected through the solar water heater’s large array of glass tubes warm up the circulating fluid to a temperature of around 60-80 degree Celsius. This heat is then transferred to the stored water flowing through the inner tube, which will remain warm till the next day morning.

SunGuru explains why its solar water heater is ideal for Indian weather conditions:



  • Our technical experts can study the solar radiation, weather condition and orientation of collectors to ensure the highest efficiency of the solar collector system
  • Right orientation of solar collectors ensures hot water on clear sunny days (maximum), partially clouded (moderate) days
  • Our latest technology Evacuated Tube Collector can heat up hard water as well
  • The Evacuated Tube Collector is made of double layer borosilicate glass tubes that are vacuumed out to provide heat insulation. The outer wall of the inner tube is coated with world class heat absorbing material that ensures rapid heat transfer
  • Stainless Steel is used for small tanks whereas Mild Steel tanks with anticorrosion coating inside are used for large tanks
  • A wide range of solar water heaters of 100-300 litres capacity that are suited for both domestic and commercial applications
  • Larger systems can be used in restaurants, guest houses, hotels, hospitals, industries etc.
  • A 100 litres capacity solar water heater can replace an electric geyser for residential use and saves 1500 units of electricity per year
  • Our water heaters can provide return on your investment within a payback period of just 3-4 years

Types of Solar Water Heating Systems

The choice of system depends on heat requirement, weather conditions, heat transfer fluid quality, space availability, annual solar radiation, etc. The SHW systems are economical, pollution free and easy for operation in warm countries like ours.

Based on the collector system, we at SunGuru, offer two types of solar water heaters:

i) Evacuated Tube Collectors (ETC) based Solar Water Heaters:
Evacuated Tube Collector is made of double layer borosilicate glass tubes evacuated for providing insulation. The outer wall of the inner tube is coated with selective absorbing material. This helps absorption of solar radiation and transfers the heat to the water which flows through the inner tube. The ETCs are a little shorter in live than the FPC as they are made up of glass which is fragile.

ii) Flat Plate Collectors (FPC) based Solar Water Heaters:
The solar radiation is absorbed by Flat Plate Collectors which consist of an insulated outer metallic box covered on the top with glass sheet. Inside there are blackened metallic absorber (selectively coated) sheets with built in channels or riser tubes to carry water. The absorber absorbs the solar radiation and transfers the heat to the flowing water. The FPCs are longer in life than the ETC as they are of metallic type.

    Benefits of Solar Water Heating System:
  • Fuel savings: A 100 liters capacity SWH can replace an electric geyser for residential use and saves 1500 units of electricity annually.
  • Avoided utility cost on generation: The use of 1000 SWHs of 100 liters capacity each can contribute to a peak load saving of 1 MW.
  • Environmental benefits: A SWH of 100 liters capacity can prevent emission of 1.5 tonnes of carbon dioxide per year.
  • Life: 15-20 years
  • Approximate cost: Rs.12000- 16,000 for a 100 liters capacity system and Rs.110-150 per installed liter for higher capacity systems.
  • Payback period: 3-4 years when electricity is replaced, 4-5 years when furnace oil is replaced, 5-6 years when coal is replaced.
© SunGuru Green Solutions Pvt. Ltd.