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The Beginner’s Guide to Understanding Backup Electric Heaters in Solar Water Heaters


Solar water heaters are a popular choice for eco-conscious homeowners looking to reduce energy bills and their carbon footprint. But what happens on cloudy days or during the winter when the sun isn’t as reliable? That’s where a backup electric heater comes into play. This guide will walk you through everything you need to know about how Solar Water Heater Backup work in solar water heaters. We’ll cover the basics, delve into the workings of these systems, and provide tips on choosing the best options for your needs. Whether you're considering installing a solar water heater in your apartment or home, this guide has got you covered.

The Beginner’s Guide to Understanding Backup Electric Heaters in Solar Water Heaters

The Basics of Solar Water Heaters

What is a Solar Water Heater?

A solar water heater is a system that uses solar energy to heat water. It consists of solar hot water panels, also known as solar collectors, which absorb sunlight and convert it into heat. This heat is then transferred to a solar water heater tank, where the water is stored until needed. Solar water heaters are an excellent option for reducing energy costs and environmental impact.

Types of Solar Water Heaters

There are primarily two types of solar water heaters: passive and active. Passive solar water heaters rely on natural circulation of water or heat transfer fluids, whereas active systems use pumps and controls to circulate the fluids. Active systems are more efficient and can include a backup electric heater to ensure a consistent hot water supply.

How Do Solar Water Heaters Work?

Solar water heaters work by absorbing sunlight through solar panels installed on the roof or any sun-exposed area. The absorbed heat is transferred to the water stored in the solar water heater tank. The heated water can then be used for various household purposes, including bathing, washing, and cooking.

The Role of Backup Electric Heaters

Why Do We Need Backup Electric Heaters?

While solar water heaters are efficient, they depend on sunlight, which can be inconsistent due to weather conditions. A backup electric heater ensures you have hot water even on cloudy days or during the night. It acts as a safety net, providing a reliable hot water supply regardless of the weather.

How Do Backup Electric Heaters Work?

Backup electric heaters are integrated into the solar water heating system. When the water temperature in the solar water heater tank drops below a certain level, the electric heater kicks in to raise the water temperature. This automatic switching ensures that you always have hot water available.

Benefits of Having a Backup Electric Heater

  • Consistency: Guarantees hot water availability regardless of weather conditions.
  • Efficiency: Complements the solar system, ensuring minimal energy waste.
  • Convenience: Provides peace of mind knowing you won’t run out of hot water.

Installing Solar Water Heaters with Electric Backup

Choosing the Right Solar Water Heater

When selecting a solar water heater, consider factors such as capacity, efficiency, and the presence of a backup electric heater. For example, a solar water heater 100 ltr price might be different from a solar water heater 150 ltr price or a 200 liter solar water heater price, depending on the features and capacity.

Installation Process

Installing a solar water heater with an electric backup involves several steps:

  1. Site Assessment: Determine the best location for the solar panels to maximize sunlight exposure.
  2. Mounting the Panels: Install the solar hot water panels securely on the roof or chosen location.
  3. Connecting the System: Link the solar panels to the solar water heater tank and integrate the electric heater.
  4. Testing: Ensure everything is functioning correctly and the backup heater activates when needed.

Maintenance Tips

Regular maintenance is crucial for the longevity and efficiency of your solar water heating system. Schedule periodic checks to clean the solar panels, inspect the tank, and ensure the electric backup is functioning correctly. If you’re looking for “solar water heater service near me,” make sure to choose a reputable service provider like Varistor Solar.

Understanding Solar Water Heater Prices

Factors Affecting Prices

Several factors influence the cost of solar water heaters, including:

  • Capacity: Larger systems like a 200 ltr solar water heater or a 300 liter solar water heater price more than smaller ones.
  • Technology: Advanced features such as backup electric heaters can increase the price.
  • Brand and Quality: Reputable brands and high-quality materials often come with a higher price tag.

Price Range

Here’s a quick overview of different solar water heater prices:

  • Solar water heater 100 ltr price: Varies from $500 to $1000.
  • Solar water heater 150 ltr price: Typically ranges from $700 to $1200.
  • 200 liter solar water heater price: Can range from $1000 to $2000.
  • Solar water heater 300 ltr price: Generally falls between $1500 and $2500.

Price in Different Locations

Prices can also vary based on location. For instance:

  • Solar heater price in Kerala: Prices might be lower due to favorable climate conditions for solar energy.
  • Solar water heater price in Bangalore: Can be slightly higher due to urban demand and installation costs.

Finding the Best Solar Water Heater for Your Needs

Evaluating Your Requirements

To find the best solar water heater for your home, consider:

  • Household Size: A larger household will need a higher capacity system.
  • Sunlight Exposure: Assess the amount of sunlight your location receives.
  • Budget: Determine how much you’re willing to invest in the system.

Recommended Brands and Models

Some of the best solar water heaters in India include:

  • Varistor Solar: Known for their high-quality systems and excellent service.
  • Best solar water heater in Bangalore: Consider local brands that offer good after-sales service.

Comparing Features

When comparing different models, look at:

  • Capacity: Ensure it meets your household’s hot water needs.
  • Backup Electric Heater: Check if it includes a reliable electric backup.
  • Efficiency: Higher efficiency models save more energy in the long run.

Common Questions About Solar Water Heaters

What are Solar Water Heater Dimensions?

The dimensions of solar water heaters vary based on capacity and design. For example, a solar water geyser might be more compact compared to a larger tank system. Always check the dimensions to ensure it fits your available space.

How to Maintain Solar Water Heater Tubes?

Solar water heater tubes need regular cleaning to remove dust and debris. This ensures maximum efficiency and longevity of the system. Check the manufacturer’s guidelines for specific maintenance tips.

Are Mini Solar Water Heaters Effective?

Mini solar water heaters are suitable for small households or specific applications like a single bathroom. They are cost-effective and can be a good option if you have limited space or budget.

How Do Solar Water Heaters Compare to Electric Heaters?

Solar water heaters are more environmentally friendly and can significantly reduce energy bills compared to traditional electric heaters. However, they rely on sunlight, so having a backup electric heater is essential for consistent performance.

Where Can I Find Solar Water Heater Dealers Near Me?

To find solar water heater dealers near you, search online or ask for recommendations from friends and neighbors. Brands like Varistor Solar offer excellent products and services, making them a reliable choice.


A solar water heater with a backup electric heater offers the perfect blend of eco-friendliness and reliability. By understanding how these systems work, what factors to consider when choosing one, and how to maintain it, you can make an informed decision that benefits both your wallet and the environment. Whether you're looking for a solar water heater in an apartment or a larger system for your home, there are plenty of options to suit your needs.

Now It's Your Turn:

Making the switch to solar water heaters in India is a smart and sustainable choice. The top brands like Varistor Solar™, Racold, Havells, V-Guard, and AO Smith offer reliable options to meet your hot water needs efficiently.

Among these, Varistor Solar™ stands out as the top choice in India, trusted by many. We provide a variety of solar water heaters, catering to different preferences and requirements. Our clients trust us for our quality and performance.

For more details about our solar water heaters, call us at 9113690456 or email sales@varistorsolar.com. Choose Varistor Solar™ for a greener and more energy-efficient future.


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