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    Budding Leaf Infratech Pvt Ltd #507, Riviera Apartments, Dwarakapuri Colony Punjagutta, Hyderabad - 500082, Telangana, INDIA

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Solar Water Heater | ETC and FPC Based Water Heaters | Budding Leaf

Solar Water Heater

With more people discovering the numerous advantages of renewable energy on the environment and their savings, solar-power energy solutions are gaining popularity and acceptance towards sustainable living.

Among the superior alternatives available for an eco-friendly approach are the solar water heaters, also known as the solar domestic water heating systems. Besides being one of the best choices to get hot water for your home and business, solar water heaters are cost-effective. Designed in such a way to save you from high electricity bills, solar water heaters use abundant renewable solar energy as a fuel to heat water for washing, cleaning and bathing.

The choice of heating system depends on heat requirement, weather conditions, heat transfer, fluid quality, space availability and annual solar radiation.

Budding Leaf Infratech is acclaimed for providing the long-lasting and highly-efficient solutions for solar water heating systems.


Broadly, solar water heating systems are of two types: closed loop system and open loop system.

  • In the first one, heat exchangers are installed to protect the system from hard water obtained from bore wells or from freezing temperatures in the cold regions.
  • In the other type, either thermo syphon or forced circulation system, the water in the system is open to the atmosphere at one point or other. The thermo syphon systems are relatively inexpensive. They are suitable for domestic and small institutional systems, provided the water is treated and potable. The forced circulation systems employ electrical pumps to circulate the water through collectors and storage tanks.

How it Works

Solar water heating systems are generally installed on the terrace to capture maximum solar energy. They comprise inter connected solar collectors to collect energy and an insulated tank for storing hot water. The water in the solar collectors gets heated during the day time and either pumped or forced into a storage tank for use when required.

Types of Solar Collectors

Evacuated tube collector (ETC-based) solar water heaters

Evacuated tube collectors comprise a number of single, transparent glass tubes which are connected to a header pipe. Unlike flat panel collectors, the cylindrical tubes are used instead of blackened heat absorbing plates. Instead of heating the water directly, air is removed or evacuated from the single tube creating a vacuum. This vacuum significantly reduces the heat losses to the atmosphere making the collector more efficient.

Flat plate collector (FPC-based) solar water heaters

In such systems, 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 harnesses the solar radiation and transfers the heat to the flowing water.

Benefits of Solar Water heater
  • Operates without fuel/electricity
  • Highly beneficial during winters
  • High efficiency, low heat loss
  • Longer operating life
  • Minimal maintenance cost
  • Economical, Eco-Friendly
Applications of Solar Heater
  • Residential Complexes
  • Educational Institutions
  • Large Scale Industries
  • Housing Societies
  • Hotels & Resorts
  • Community Centers


Rooftop Solar Panels for Home

our achivements

Why Budding Leaf for Solar Power Systems?
  • 1600

    Rooftop Solar
    Projects Completed

  • 24x7

    Customer Support

  • 100

    Locations in

  • 12

    Years in
    Solar Industry

  • 14 MW

    Power Installations

  • 1500

    Satisfied Customers

Solar Rooftop Projects We Delivered

Our Testimonials


Frequently Asked Questions

In general, there are two types of solar water heaters – flat plate collectors (FPC) and Evacuated tube collectors (ETC). FPC are made up of metal plates and have a longer operation life than ETC, which in turn are fragile as they are made of glass. However, ETC solar heaters are cheaper than FPC systems.

They are better suited for colder regions and during sub-zero temperatures, they avoid freezing problem. FPC-based solar water heaters also work well at sub-zero temperatures but their operational cost increases. For places having hard water or more chlorine content, if an FPC solar heater is being installed, it is suggested to get a heat exchanger connected with it to avoid scale deposition on transfer tubes which may otherwise block the water flow and reduce the heating performance. In EPC solar heating systems, water flow does not get blocked but the performance is reduced following the deposition of salts on glass tubes. They can, however, be cleaned.

Since the water heating takes place following diffused radiation in the atmosphere, you will continue to get warm water for a day or two during cloudy days. In such scenarios, an electrical back-up is provided to the storage tank of solar water heater, and is switched on if the water in the tank is not as hot as required.

A solar heater of capacity 100 litres is suitable for about 4 people and depending on the amount of water usage it can save up to 1500 units of electricity per year. It also reduces greenhouse gas emissions besides saving litres of fuel burning and thus saving your money. Higher-capacity solar water heaters will save more electricity.

Solar water heating systems like other solar products have extremely low maintenance requirements. Rare leakages due to wear and tear can easily be repaired by plumbers. In case of scale deposition in the collectors over the years following hard water, solar water heater suppliers should be contacted for cleaning or de-scaling with acids. In case of a broken glass tube, solar heater suppliers should be contacted. The outside surfaces of the solar heating systems should be painted again in every 2-3 years to avoid surface corrosion.

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