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How To Build a DIY Solar Pool Heater: A Step-by-Step Guide

DIY solar pool heaters are made up of solar panels that capture the heat energy from the sun. This energy is then transferred to a fluid, which circulates through the pool, effectively heating the water.

DIY solar pool heaters are a fantastic idea to enjoy hot water in your pool without breaking the bank or costing the environment. These innovative devices offer efficient pool heating solutions that eliminate the need for fossil fuels or electricity.

This article will provide a step-by-step guide on constructing your DIY solar pool heater. By following these instructions, you can take a proactive step towards cutting your energy costs while positively impacting the environment. 

So, read till the end because I will also answer some of the most common questions about building your own solar DIY pool heater!

How To Build a DIY Solar Pool Heater: A Step-by-Step Guide


To build a DIY solar pool heater, you will need the following materials:

Solar Panels

Solar panels gather sunlight and transform it into usable heat energy. You can find solar panels from various sources, including online retailers, specialized solar suppliers, and home improvement stores. 

The price of solar panels will vary based on factors such as their size, efficiency, and brand. On average, expect to spend several hundred to a few thousand dollars for solar panels.

Black Irrigation Hose

The 200 feet of 0.5-inch polyurethane hose required for this project can be purchased from online retailers or local hardware stores. It is advisable to compare prices and seek the best deal available. Ensure the hose is black, as it must absorb solar heat effectively. 

You need more than 200 feet of DIY solar pool heater black hose for larger pools. The hose length should be at least 50% of the pool’s surface area. If your pool measures 16 feet by 32 feet, with a surface area of 512 square feet, you require a minimum of 256 feet of irrigation hose.

Plywood Board And Wood Pieces

The wooden tray serves as a platform for your irrigation hose, elevating it from the cold ground and enabling you to position it at an optimal angle toward the sun. The size of the plywood required depends on the length of the hose being used. 

For approximately 200 feet of hose, a 4×4 sheet of plywood is sufficient. You will need additional pieces of wood to stabilize and frame the plywood sheet. Have an extra piece of wood to secure the coiled hose in place. 

You will require wood glue, a drill, and appropriate screws or nails to secure the wood properly. Alternatively, a hammer and nails can combine the wood components.


You will need a fluid that can effectively transfer heat from the solar panels to your pool. Standard options include water or antifreeze solutions. 

Water is readily available and cost-effective, while antifreeze may be required in colder climates to prevent freezing. The cost of the fluid will depend on the quantity required and the type chosen.


A pump is necessary to circulate the fluid between the solar panels and your pool. You can purchase a pump from pool supply stores, online retailers, or home improvement stores.


You will need plumbing materials like pipes, connectors, and valves to connect the solar panels, pump, and pool. These can be found at hardware stores or plumbing supply outlets. The cost will depend on the size of your system and the specific materials required.


Solar pool heating kits will be necessary for assembling the above-ground pool heater DIY, including wrenches, screwdrivers, pipe cutters, and a drill. These tools can be found in your existing toolbox or purchased from hardware stores.


Here are the step-by-step instructions on how to build your solar pool heater: 

  1. Prepare the wooden tray: Create a raised platform using a flat sheet of plywood or enhance its stability by adding wooden sides. This will mount your irrigation hose, allowing you to position it towards the sun.
  1. Line the wooden tray: Optionally, cover the surface of the wooden tray with black fabric, black felt, or black paint. Adding a black lining helps maximize heat absorption, although this may not be necessary for smaller pools.
  1. Arrange the irrigation hose: Mix it on the wooden tray, ensuring it lies flat on the ground. Wind the hose tightly to fit in as many loops as possible. Placing a 2×4 wood board on top of the hose can provide support, and an extra set of hands can be helpful. Position the hose on opposite sides of the tray.
  1. Wrap the solar heater (optional): If desired, wrap your solar heater with a transparent tarp. However, I recommend you test the heater before adding the tarp.
  1. Attach hose fittings: Connect the irrigation hose connector to the end that will be inserted into your pool, facilitating the connection to the sump pump. Also, attach a shut-off valve or ball valve to the opposite end of the hose.
  1. Position the solar heater and connect the sump pump: Place the wooden tray near your pool in a sunny location, elevated off the ground. Connect the sump pump to the irrigation hose connector and submerge the pump in the water. Activate the sump pump, ensuring the hose outlet is inside the pool to return the heated water.

Just take good care of your solar pool heating system and enjoy hot pool water for a long while.


Building a homemade solar pool heater can be a rewarding and cost-effective project. To ensure success, here are some essential tips to consider:

Correct Alignment of Solar Panels

The positioning of your solar panels is crucial for optimal sunlight absorption. Align them properly with the sun’s path to maximize energy capture. 

Orient the panels to face south in the Northern Hemisphere or north in the Southern Hemisphere. Additionally, adjust the angle of the panels according to the sun’s position throughout the day.

Choose the Right Fluid

Appropriate fluid is vital for efficient heat transfer. Water is common, but antifreeze may be necessary in colder climates to prevent freezing. Research the recommended fluid for your specific climate conditions and system requirements to ensure optimal performance.

Regular Cleaning of Solar Panels

Keep your solar panels clean and maximize their efficiency. Regularly remove dirt, dust, and other debris obstructing sunlight absorption. Wash the panels with water and a soft brush, avoiding abrasive materials.

Perform Regular Inspections

Regularly inspect your homemade pool heater to identify any leaks, damage, or signs of wear and tear. Check the connections, hoses, valves, and pump for potential issues. Addressing problems promptly can prevent further damage and maintain the longevity of your system.

Common Mistakes To Avoid

Improper alignment: Failing to align the solar panels correctly can significantly reduce their effectiveness. Always ensure panels are angled towards the sun and adjust as needed throughout the day.

Using the wrong fluid: An unsuitable fluid can hinder heat transfer and damage your system. Research and select the appropriate fluid based on your needs and climate conditions.

Neglecting panel cleaning: Dirty or obstructed solar panels will absorb less sunlight, resulting in decreased heating efficiency. Regularly clean the panels to maintain optimal performance.

By adhering to these tips and avoiding common mistakes, you can ensure that your DIY solar pool heater operates effectively, providing efficient and eco-friendly heating for your pool.


Building a DIY solar pool heater offers both financial savings and environmental benefits. In this article, I have provided a comprehensive guide to constructing your homemade solar pool heater, from understanding how it works to listing the necessary materials and offering step-by-step instructions.

Solar energy is renewable and clean, contributing to a reduced carbon footprint. Not only will you enjoy a comfortably heated pool, but you’ll also see a significant reduction in energy bills.

I encourage you to embark on this fun and rewarding project. Building a DIY solar pool heater allows you to tap into the potential of solar energy, empowering you to take control of your pool’s heating while benefiting the environment.

It’s an opportunity to expand your knowledge of sustainable energy and positively impact your energy consumption.

So, why not give it a try? With the information in this article, you have all the tools to embark on a successful DIY solar pool heater project. Enjoy the warmth of your pool while knowing you’ve made a step towards a greener and more cost-effective future.

If you would rather watch a video, here is something from Swim University:


Do DIY solar pool heaters work? 

DIY solar pool heaters can heat swimming pools using the sun’s energy.

What is the flow rate for DIY solar pool heater? 

The ideal flow rate for a DIY solar pool heater depends on factors like the pool size and panel size, but a common range is around 0.5 to 1.5 gallons per minute per square foot.

Can you heat a swimming pool with solar? 

Yes, you can use solar energy to heat a swimming pool by installing solar pool heaters, which are cost-effective and environmentally friendly.

How do you make a simple solar water heater? 

A simple solar water heater can be made using a black container to absorb sunlight, pipes for water circulation, and insulation to retain heat.

Does a solar blanket heat a pool? 

Yes, a solar blanket, also known as a solar cover, helps heat a pool by trapping heat from the sun and preventing heat loss through evaporation.

Do solar pool heaters need a pump? 

Yes, homemade pool heaters require a pump to circulate water through the solar panels, enabling heat transfer from the sun to the pool.


  • Raoul Hayes

    Raoul Lobo is a seasoned expert in the realm of home appliances and environmental comfort. As a prominent author at, Raoul's passion and expertise shine through in his insightful articles and guides. With years of hands-on experience, he has become a trusted source for readers seeking advice on pools, washers, dryers, and a wide range of other appliances.

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