Solar Water Heating Systems

We are blessed with Solar Energy in abundance at no cost. The solar radiation incident on the surface of
the earth can be conveniently utilized for the benefit of human society. One of the popular devices that harness the
solar energy is solar hot water system (SHWS).

A solar water heater consists of a collector to collect solar energy and an insulated storage tank to store hot water. The solar energy incident on the absorber panel coated with selected coating transfers the hat to the riser pipes underneath the absorber panel. The water passing through the risers get heated up and is delivered the storage tank. The re-circulation of the same water through absorber panel in the collector raises.

Types of Solar Water Heating Systems

Based on Systems working Principal

Water Heating Type

  • Direct Heating
  • Indirect Heating ( Heat Exchanger)


  • Thermo siphon / Gravitational Force
  • Force Circulation by using Pressure Pump


Based on Collector- There are Two Types of Solar Water Heaters available

  • Flat plate collector (FPC) based systems are of metallic type and have longer life as compared to ETC —
  • Evacuated tube collector (ETC) based are made of glass which are of fragile in nature—-

Advantages of Solar Power

Benefits of a Solar Water Heater:

Benefits of a Solar Water Heater Luxuriously hot water; it’s what you’ve always longed for. Now it’s possible to enjoy it
for a fraction of the cost and that too with very little impact on the environment. Invest in a solar water heater and enjoy hot
water every day. Put in a solar water heater on your roof. As the water circulates, the sun will heat the water and it is available through the tap. There are three types of savings you make from installing a solar water heater

Energy: You make significant savings on energy as electricity consumption is being avoided. You save anywhere
between 50% to 90% on your electricity bill. Which translates into that much less energy that needs to be produced.

Water heating costs:
An average home can save big money from its electricity bills every year, especially at the rate that energy costs are
skyrocketing across the globe. This results in major savings in the family budget.

Environment: Harnessing the suns energy is surely a way to ahead for good, clean and free energy. A family of 4 that
uses a solar water heater can save up to 3 or 4 tonnes of greenhouse gas emissions when compared with a conventional electric heater. That is equivalent to taking one small car off the road. Can you imagine the huge impact it has on the environment as well as on our future generations?

Salient Features of Solar Water Heating System

Solar Hot Water System turns cold water into hot water with the help of sun’s rays.
 Around 60 deg. – 80 deg. C temperature can be attained depending on solar radiation, weather conditions and solar collector system efficiency
 Hot water for homes, hostels, hotels, hospitals, restaurants, dairies, industries etc.
 Can be installed on roof-tops, building terrace and open ground where there is no shading, south orientation of collectors and over-head tank above SWH system
 SWH system generates hot water on clear sunny days (maximum), partially clouded (moderate) but not in rainy or heavy overcast day
 Only soft and potable water can be used
 Stainless Steel is used for small tanks whereas Mild Steel tanks with anticorrosion coating inside are used for large tanks
 Solar water heaters (SWHs) of 100-300 litres capacity are suited for domestic application.
 Larger systems can be used in restaurants, guest houses, hotels, hospitals, industries etc.