Discuss Solar Thermal Fluid Leak in the Renewables area at Plumbers Forums


My solar thermal system appears to be leaking fluid (pics attached). Could anyone give me an indication of what the issue is likely to be and the potential cost to rectify?

The system was installed in May 2021 and has a flat plate panel on the roof. It works very well generally and between March to October I do not need to use the boiler for the hot water.

The other factor that I am considering is whether to have this removed and replaced for solar PV.


  • Pic 1.jpg
    Pic 1.jpg
    567.3 KB · Views: 34
  • Pic 2.jpg
    Pic 2.jpg
    532.1 KB · Views: 25
  • Pic 3.jpg
    Pic 3.jpg
    606.2 KB · Views: 26
  • Pic 3a.jpg
    Pic 3a.jpg
    667.5 KB · Views: 24
  • Pic 4.jpg
    Pic 4.jpg
    424.2 KB · Views: 21
  • Pic 5.jpg
    Pic 5.jpg
    319.6 KB · Views: 23
Tbh only option is to get a solar thermal company out to repair and flush the old liquid out and re mix a new batch

New Threads

AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock