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How to Clean Your Solar Water Heater Tank: A Beginner’s Guide

How to clean solar water heater tank can seem like a daunting task, but with the right guidance, it can be quite straightforward. Solar water heaters are an excellent investment for homes, apartments, hospitals, and guest houses. They provide an eco-friendly solution to hot water needs, and regular maintenance ensures their efficiency and longevity. In this guide, we will walk you through the process step-by-step, ensuring your solar water heater performs optimally for years to come.

how to clean solar water heater tank

Table of Contents

  1. Introduction to Solar Water Heaters
  2. Why Regular Maintenance is Crucial
  3. Tools and Materials Needed
  4. Step-by-Step Cleaning Guide
  5. Special Considerations for Different Settings
  6. Frequently Asked Questions

Introduction to Solar Water Heaters

Understanding Your Solar Water Heater

A solar water heater uses solar panels (or solar hot water panels) to capture energy from the sun to heat water. These systems are widely used in various settings, including homes, apartments, hospitals, and guest houses, due to their efficiency and cost-effectiveness. Solar water heaters come in different sizes and capacities, from 25 liters to 300 liters, catering to various needs and budgets. For example, the solar water heater 100 ltr price varies depending on the brand and additional features.

Benefits of Solar Water Heaters

Solar water heaters are environmentally friendly, reduce electricity bills, and have a long lifespan. They are available in various configurations and prices, making it easy to find the best solar water heater for your specific needs. Whether you are looking for a solar water heater for home use, a solar water heater in an apartment, or a solar water heater in a hospital, these systems offer significant advantages over traditional heating methods.

Why Regular Maintenance is Crucial

Prolonging the Life of Your Solar Water Heater

Regular maintenance of your solar water heater tank is essential for ensuring its longevity and performance. Over time, sediment and scale can build up inside the tank, reducing its efficiency and potentially causing damage. By cleaning your solar water heater tank periodically, you can prevent these issues and ensure your system continues to provide hot water efficiently.

Ensuring Optimal Performance

Cleaning your solar water heater tank helps maintain its efficiency, which can significantly affect your energy savings. Regular maintenance can also prevent costly repairs and extend the life of your system. Whether you have a solar geyser, a 200 litre solar water heater, or a solar water heater with electric backup, keeping the tank clean is crucial for optimal performance.

Tools and Materials Needed

What You’ll Need

Before you start cleaning your solar water heater tank, gather the necessary tools and materials. Here’s a list to help you get started:

  • Adjustable wrench
  • Screwdriver
  • Garden hose
  • Vinegar or a commercial descaling solution
  • Bucket
  • Soft brush or cloth
  • Safety gloves and goggles
  • Towels or rags

Having these items ready will make the cleaning process smoother and more efficient.

Safety First

Safety is paramount when working with solar water heaters. Always wear gloves and goggles to protect yourself from any potential hazards. Additionally, make sure the system is turned off and the water inside the tank has cooled down before you begin cleaning.

Step-by-Step Cleaning Guide

Step 1: Turn Off the System

Before you start cleaning, turn off the solar water heating system. If your system has an electric backup, make sure to turn off the power supply to avoid any accidents. Allow the water in the tank to cool down to a safe temperature.

Step 2: Drain the Tank

Locate the drain valve at the bottom of the tank and attach a garden hose to it. Place the other end of the hose in a suitable drainage area or a large bucket. Open the valve and let the water drain out completely. This step helps remove any loose sediment and prepares the tank for a thorough cleaning.

Step 3: Remove and Clean the Collector

If your solar water heater has a collector, you’ll need to clean it as well. Use a soft brush or cloth to remove any dirt or debris from the collector’s surface. This step ensures that the collector can efficiently capture solar energy.

Step 4: Descale the Tank

Sediment and scale buildup can significantly affect your solar water heater’s performance. To descale the tank, fill it with a mixture of vinegar and water or a commercial descaling solution. Let the solution sit for a few hours to break down the scale. Afterward, drain the tank again and rinse it thoroughly with clean water.

Step 5: Clean the Tank Interior

Use a soft brush or cloth to scrub the interior of the tank gently. Focus on removing any remaining sediment or scale. Be careful not to damage the tank’s lining. Once you’ve cleaned the interior, rinse the tank thoroughly to remove any residue.

Step 6: Reassemble and Refill

After cleaning, reassemble any components you removed, such as the collector. Close the drain valve and refill the tank with clean water. Turn on the system and check for any leaks. Once everything is in place, your solar water heater should be ready to provide hot water efficiently.

Special Considerations for Different Settings

Solar Water Heaters in Apartments

If you live in an apartment, you may have a smaller solar water heater, such as a 25-liter or 100-liter unit. These systems are often easier to clean due to their smaller size. However, it’s essential to check with your building management for any specific maintenance guidelines or restrictions.

Solar Water Heaters in Hospitals

Hospitals typically use larger solar water heating systems, such as 200-liter or 300-liter units, to meet their extensive hot water needs. Regular maintenance is crucial in these settings to ensure a reliable hot water supply. It may be beneficial to hire a professional service for cleaning and maintenance to ensure the system remains in optimal condition.

Solar Water Heaters in Guest Houses

Guest houses often have mid-sized solar water heaters, such as 150-liter units. Regular cleaning and maintenance are essential to provide guests with a consistent hot water supply. Consider scheduling regular maintenance checks, especially during peak seasons, to ensure your system is always ready to meet demand.

Frequently Asked Questions

How Often Should I Clean My Solar Water Heater Tank?

It’s recommended to clean your solar water heater tank at least once a year. However, if you live in an area with hard water or notice a decrease in performance, more frequent cleaning may be necessary.

Can I Clean the Tank Myself, or Should I Hire a Professional?

While it’s possible to clean the tank yourself, hiring a professional can ensure thorough cleaning and proper maintenance. Professionals have the experience and tools to clean your system efficiently and safely.

What is the Cost of Professional Cleaning Services?

The cost of professional cleaning services can vary depending on your location and the size of your solar water heater. On average, you can expect to pay between $100 to $300 for professional cleaning.

Where Can I Find a Reliable Service Provider?

Search for "solar water heater service near me" to find local service providers. You can also check with the manufacturer or the company that installed your system for recommendations.

Are There Any Specific Brands or Models That Are Easier to Maintain?

Some brands and models are designed with easy maintenance in mind. For example, Varistor Solar offers a range of solar water heaters that are known for their durability and ease of maintenance. Researching and choosing the best solar water heater for your needs can save you time and effort in the long run.


Regular maintenance of your solar water heater tank is essential for ensuring optimal performance and longevity. By following the steps outlined in this guide, you can keep your system running efficiently and enjoy the benefits of clean, renewable energy. Whether you have a small solar water heater in an apartment or a large system in a hospital, regular cleaning and maintenance are key to a reliable hot water supply.

Now It's Your Turn:

Making the switch to solar water heaters in Delhi 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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