Common Problems with Solar Hot Water: What You Should Know
Experiencing issues with your solar hot water system? Learn about the most common problems and how to fix them, from low pressure to pump failures.
May 31, 2025 | Steve Simoes
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Solar hot water systems are fantastic for reducing your household’s environmental footprint, slashing your energy bills, and enhancing the overall value of your home. That said, they can also be a bit temperamental from time to time.
Low Water Pressure
If you’re not getting enough hot water from your solar system, low water pressure might be the root of the problem. This could be caused by a blockage in the pipes, a failing pump, or an issue with the pressure relief valve. To fix this, you might need to clear out any blockages, replace a faulty pump, or have a plumber adjust the pressure relief valve.
Lack of Hot Water
One of the most common issues homeowners face with their solar hot water systems is a lack of hot water. If the sun isn’t shining or if your system is undersized, you may find yourself without hot water. One solution is to install a backup heating system, such as an electric or gas heater.
Leaks
Leaks can be a real problem with solar hot water systems, but they are often easy to fix. Check the connections between the pipes and the tank to ensure they are tight, and check the pipes themselves for any visible leaks. If you can’t find the source of the leak, it’s best to call in a professional.
Inefficient Heating
If your solar hot water system is not heating effectively, it may be due to a build-up of scale or sediment in the tank. Flushing the tank periodically can help remove sediment and improve your system’s efficiency.
Air in the System
If your solar hot water system has become filled with air, it might not be able to circulate or heat the water properly. To fix this, you’ll need to bleed the air out of the system or have a professional plumber do this for you.
Water Too Hot or Too Cold
If the water from your solar hot water system is too hot or too cold, it may be due to a faulty thermostat or sensing unit – check these components and replace them if necessary.
Pump Not Working
If the pump in your solar hot water system is not working, the water won’t circulate properly and your system won’t function. Check the pump for any visible signs of damage, and test it to ensure it’s working properly. If not, it may need to be replaced.
The information provided is for general information purposes only and does not constitute legal, or professional advice. While care has been taken to ensure accuracy, the information may not be complete, current, or applicable to your specific situation. You should always do your own research and, where appropriate, seek advice from a qualified professional before making any decisions based on this information.
Solar Hot Water Problems Are Expensive Enough Without Adding an Untrustworthy Tradie
A failing pump, a pressure issue, or a leaking collector, Solar hot water faults need a licensed plumber who can diagnose correctly the first time, not someone guessing at what needs replacing. Simfield members get qualified tradies at capped hourly rates with no incentive to oversell. So when your system plays up, the fix costs what it should and nothing more.