Solar Water Heating System

Inter Solar Water Heating System works on the principle of black body absorption. The Selective Coatings used in solar collector absorbs solar radiation and convert it to Heat Energy. The hot water rises up in the risers of the collector & returns to the hot water storage tank. There is no requirement of motor or pump to circulate in thermosyphon type system however in forced system the pump is required for circulation of water.

The Three super high efficiency selective coating on the inner cover of high boron and silicon content evacuated tubes absorbs the heat. When temperature rises, the density of water drops and weight goes down, hot water will go up to exchange with cold water in tank. In this way, the temperature of the water in tank goes up. ETC technology is suitable for domestic non-pressurised hot water application.

A solar water heating system (also called a solar thermal system) uses sunlight to heat water for residential, commercial, or industrial use. It reduces the need for electricity or gas to heat water, leading to energy savings and lower carbon emissions.

Types of Solar Water Heating Systems

Active Systems (With Pumps)

• Use electric pumps to circulate fluid through collectors.

• More efficient and suitable for colder climates or larger systems.

Two Subtypes:

• Direct (Open-loop): Water flows directly through the collector.

  • Best for mild, non-freezing climates.

• Indirect (Closed-loop): Heat transfer fluid (like antifreeze) circulates through a closed loop.

  • Ideal for cold or freezing areas.

Passive Systems (No Pumps)

• Use natural convection to circulate water.

• Fewer parts = lower cost and maintenance.

Two Common Types:

• Integral Collector Storage (ICS): Collector and storage combined.

  • Good for warm climates.

• Thermosyphon: Tank is mounted above the collector, using gravity flow.

  • Reliable and simple, but may need roof reinforcement.

  • Advantages of Solar Water Heating

    Environmentally Friendly

    • Cuts down on fossil fuel use and greenhouse gas emissions.

    Lower Energy Bills

    • Sunlight is free — after installation, heating costs drop significantly.

    Low Maintenance

    • Durable systems with 15–25 year life spans.

    • Minimal maintenance required after installation.