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How to Remove Air from a Solar Water Heater: A Beginner’s Guide


Solar water heaters are an excellent way to reduce your energy bills and minimize your carbon footprint. However, like any system, they need regular maintenance to function effectively. One common issue is air getting trapped in the system, which can reduce its efficiency. In this comprehensive guide, we’ll walk you through how to remove air from your solar water heater. We’ll cover everything from basic concepts to step-by-step instructions, ensuring you have all the information you need to keep your solar water heater running smoothly.


Remove Air from Solar Water Heater

Table of Contents

  1. Introduction to Solar Water Heaters
  2. Why Air Gets Trapped in Solar Water Heaters
  3. Signs of Air Trapped in Your Solar Water Heater
  4. Tools Needed to Remove Air
  5. Step-by-Step Guide to Remove Air from Your Solar Water Heater
  6. Maintaining Your Solar Water Heater
  7. Conclusion

Introduction to Solar Water Heaters

What is a Solar Water Heater?

A solar water heater uses solar panels, often referred to as solar hot water panels, to absorb sunlight and convert it into heat. This heat is then used to warm water in a tank, providing a sustainable and eco-friendly way to get hot water for your home, apartment, hospital, or guest house.

Types of Solar Water Heaters

Solar water heaters come in various types and capacities, such as the 100-liter, 150-liter, 200-liter, and 300-liter models. Prices vary based on capacity and brand. For instance, the solar water heater 100 ltr price is different from the solar water heater 150 ltr price or the solar water heater 300 ltr price.

Benefits of Solar Water Heaters

  • Cost-effective: Reduced energy bills.
  • Eco-friendly: Lower carbon footprint.
  • Versatile: Suitable for various applications like homes, hospitals, PGs, and guest houses.
  • Reliable: Provides hot water even during power outages.

Solar water heaters are an investment worth considering, especially given the increasing solar heater prices and water solar price trends. If you’re interested in buying, you might search for terms like "solar water heater near me" or "solar water heater price in Bangalore" to find local dealers.

Why Air Gets Trapped in Solar Water Heaters

Causes of Air Entrapment

Air can get trapped in your solar water heater due to several reasons:

  • Installation Issues: Poor installation can leave air pockets in the system.
  • Maintenance Neglect: Regular checks and maintenance can prevent air build-up.
  • Leaks: Tiny leaks in the system can allow air to enter.
  • System Draining: Draining the system for repairs or during winter can introduce air when refilling.

Impact of Air in the System

Air trapped in your solar water heater can cause:

  • Reduced Efficiency: Air pockets can block water flow, reducing heating efficiency.
  • Noise: Air bubbles can create annoying noises in the system.
  • Inconsistent Water Temperature: Fluctuating water temperature due to uneven heating.

Understanding why air gets trapped helps you prevent it and address it more effectively when it happens.

Signs of Air Trapped in Your Solar Water Heater

Symptoms to Look Out For

Identifying the presence of air in your solar water heater can save you from bigger issues down the line. Here are some common signs:

  • Noisy Operation: Gurgling or bubbling sounds.
  • Reduced Water Pressure: Water flow is weaker than usual.
  • Inconsistent Water Heating: Hot water turns cold intermittently.
  • Air from Faucets: Air spits out when you turn on the hot water tap.

Recognizing these symptoms early allows you to take prompt action, ensuring your solar water heater functions optimally.

Tools Needed to Remove Air

Essential Tools

Before starting the air removal process, gather the following tools:

  • Wrench: For loosening and tightening connections.
  • Screwdriver: To open panels or covers.
  • Hose: To drain water if necessary.
  • Bucket: To catch drained water.
  • Teflon Tape: For sealing connections after removing air.
  • Pressure Gauge: To check system pressure before and after air removal.

Having the right tools on hand makes the process smoother and helps prevent damage to your solar water heater.

Step-by-Step Guide to Remove Air from Your Solar Water Heater


  1. Turn Off the System: Switch off the solar water heater to prevent any accidents.
  2. Cool Down: Allow the system to cool down to avoid burns from hot water.

Step 1: Locate the Air Valve

Find the air valve on your solar water heater. This is usually located near the highest point of the system.

Step 2: Attach the Hose

Attach one end of the hose to the air valve and place the other end in a bucket to catch any water that might come out.

Step 3: Open the Valve

Slowly open the air valve using a wrench. You should hear a hissing sound as the air starts to escape. Allow the air to bleed out until water begins to flow steadily from the hose.

Step 4: Close the Valve

Once the water flow is steady and bubble-free, close the valve tightly using the wrench. Make sure there are no leaks.

Step 5: Check the System Pressure

Use the pressure gauge to check the system pressure. If the pressure is low, you might need to add more water to the system. Follow the manufacturer’s instructions for this.

Step 6: Test the System

Turn the solar water heater back on and check for any unusual noises or fluctuations in water temperature. Ensure the system runs smoothly and efficiently.

Maintaining Your Solar Water Heater

Regular Maintenance Tips

Regular maintenance can prevent air from getting trapped and ensure your solar water heater works efficiently:

  • Inspect Regularly: Check for leaks, rust, or damage.
  • Clean the Panels: Keep the solar hot water panels clean for maximum efficiency.
  • Check the Tank: Inspect the solar water heater tank for sediment build-up.
  • Service Annually: Have a professional service your system at least once a year.

When to Call a Professional

If you’re not confident in performing maintenance yourself or if you encounter complex issues, it’s best to contact a professional. Search for "solar water heater service near me" to find reliable technicians in your area.


Maintaining your solar water heater is crucial for its efficiency and longevity. By removing air from the system and performing regular maintenance, you can ensure a steady supply of hot water and maximize the benefits of your investment. Whether you have a solar water heater in an apartment, hospital, or guest house, these tips will help you keep your system running smoothly.

If you’re in the market for a new solar water heater, consider factors like capacity, brand, and price. Search for terms like "best solar water heater", "solar water heater price in Bangalore", or "solar heater price in Kerala" to find the best deals. Remember, a well-maintained solar water heater not only saves you money but also contributes to a greener planet.


The cost of a solar water heater can vary widely depending on the capacity and brand. For instance, the solar water heater 100 ltr price typically ranges from $300 to $600. A 150-liter solar water heater price is usually between $500 and $900, while the 200-liter solar water heater price can go from $700 to $1,200. If you're looking for a specific area, such as the solar heater price in Bangalore or solar water heater price in Kerala, prices might differ due to local market conditions and installation costs. Always consider searching for "solar water heater near me" to get the most accurate pricing and find local dealers.

Yes, a solar water heater can be installed in an apartment, although it requires some planning. Smaller units like a mini solar water heater or systems designed for limited space are ideal. These systems often have a smaller capacity, such as a solar water heater 25 ltr price range, which suits the needs of an apartment. Installation in an apartment complex might require permissions from the building management, so it's best to discuss it with them and consult a professional installer to ensure compatibility with your space.

Installing a solar water heater in a hospital offers numerous benefits:

  • Cost Savings: Significant reduction in energy bills due to the large volume of hot water usage.
  • Reliability: Continuous hot water supply even during power outages.
  • Environmental Impact: Reduces the hospital's carbon footprint, contributing to greener operations. Hospitals often require larger systems like a 200-liter or even a 300-liter solar water heater. The 200 liter solar water heater price and the solar water heater 300 ltr price reflect their higher capacity and efficiency, making them ideal for such demanding environments.

Regular maintenance is crucial for the efficient operation of your solar water heater. It is recommended to have a professional service your system at least once a year. Regular inspections help identify and fix issues like air traps, leaks, and sediment build-up in the solar water heater tank. For those looking for local service options, searching for "solar water heater service near me" can connect you with qualified technicians in your area. Regular maintenance ensures longevity and optimal performance of your system.

When looking for the best solar water heater in India, consider brands that offer high efficiency, durability, and good customer service. Some of the top brands include:

  • Varistor Solar: Known for their reliable and efficient solar water heating systems.
  • Tata Solar: Offers a range of solar water heaters suitable for different needs.
  • Racold: Provides a variety of models with advanced features and robust build quality. The best solar water heater in India would depend on your specific requirements, such as capacity and additional features like electric backup. For example, the best solar water heater 200 ltr price might differ from that of a smaller unit but provides the necessary capacity for larger households or commercial use.

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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