Hey there! As a supplier of 120L solar water heaters, I often get asked about how to add anti-freeze fluid to these units. It's a crucial step, especially if you live in an area where the temperatures can drop below freezing. In this blog, I'll walk you through the whole process step by step.
First off, let's talk about why anti-freeze fluid is so important for your 120L solar water heater. When water freezes, it expands. This expansion can cause serious damage to the pipes and components of your solar water heater. Anti-freeze fluid lowers the freezing point of the water in the system, preventing it from freezing and protecting your investment.


Now, before you start adding anti-freeze fluid, you need to gather the right tools and materials. You'll need a suitable anti-freeze fluid. Make sure it's compatible with your solar water heater system. You can usually find this information in the user manual that came with your heater. You'll also need a funnel, a measuring container, and some safety equipment like gloves and goggles. Safety first, folks!
The next step is to locate the filling point on your 120L solar water heater. This is typically near the top of the unit or on one of the sides. It might be covered by a cap or a small panel. Once you've found it, carefully remove the cap or panel. Be gentle, you don't want to damage anything.
Now, here's where the funnel and measuring container come in handy. Pour the anti-freeze fluid into the measuring container and measure out the right amount. The amount of anti-freeze you need depends on the size of your system and the type of anti-freeze you're using. Again, check the user manual for the exact specifications.
Once you've measured the anti-freeze, place the funnel in the filling point and slowly pour the fluid into the system. Take your time and make sure you don't spill anything. It's a good idea to have a cloth nearby to clean up any spills.
After you've added the anti-freeze, it's time to check the level. Most solar water heaters have a sight glass or a level indicator. Check to make sure the fluid level is within the recommended range. If it's too low, add a little more anti-freeze. If it's too high, you might need to drain some out.
Now, it's important to circulate the anti-freeze fluid throughout the system. You can do this by turning on the pump if your system has one. Let the pump run for a few minutes to make sure the anti-freeze is evenly distributed.
Once you've circulated the anti-freeze, it's a good idea to check for any leaks. Look around the filling point and all the connections for any signs of fluid leakage. If you find a leak, turn off the system immediately and fix it before you continue.
Finally, replace the cap or panel on the filling point. Make sure it's securely in place. And that's it! You've successfully added anti-freeze fluid to your 120L solar water heater.
But wait, there's more! At our company, we offer a range of different solar water heaters to suit your needs. If you're interested in a different type of solar water heater, check out our Flat Solar Water Heater, Unpressurized Solar Water Heater, or Portable Solar Water Heater. These are all high-quality products that are designed to be efficient and reliable.
If you have any questions about adding anti-freeze fluid or any other aspect of our solar water heaters, don't hesitate to get in touch. We're here to help you make the most of your solar energy system. Whether you're a homeowner or a business owner, we can provide you with the right solution for your hot water needs.
So, if you're in the market for a new solar water heater or you need some advice on maintenance, give us a shout. We'd love to hear from you and help you find the perfect solar water heater for your home or business.
References
- Manufacturer's user manual for 120L solar water heater
- Industry best practices for solar water heater maintenance



