The solar fluid is a non-toxic 40/60 propylene glycol and water solution which has been specifically developed for solar thermal applications to protect the systems from freezing.
No. The solar fluid used in a Grant solar thermal system is a 40% propylene glycol solution. This provides frost protection for the collectors and external pipework down to -25°C. How often do I need to replace the fluid in my solar installation?
Most solar thermal systems use antifreeze as the liquid to transport heat from the solar panel to the cylinder. However, there are a few drain back systems that only use water. The antifreeze is normally non-toxic propylene glycol (as opposed to toxic ethylene glycol). An antifreeze change may be required for your solar system.
Heat-transfer fluids carry heat through solar collectors and a heat exchanger to the heat storage tanks in solar water heating systems. When selecting a heat-transfer fluid, you and your solar heating contractor should consider the following criteria: Flash point – the lowest temperature at which the vapor above a liquid can be ignited in air.
Maintenance tasks typically include cleaning the solar collectors and inspecting all components for wear and tear. To maximize the system's efficiency and track its performance, it is beneficial to implement monitoring tools. Monitoring helps identify potential issues early on and provides valuable data for system optimization.
Solar water heating systems that use an antifreeze solution (always propylene glycol, never or ethylene glycol because of toxicity) as a heat-transfer fluid have effective freeze protection as long as the proper antifreeze concentration is maintained. Antifreeze fluids degrade over time and normally should be changed every 3–5 years.
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