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Can Fernox Leak Sealers be used in combination boilers?

April 26, 2017boilers combination fernox leak sealers Used

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Can Fernox Leak Sealers be used in combination boilers?

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Yes, all internal Fernox Leak Sealers F4 are safe for use with combination and other low water content boilers. They will not block valves or vents. We recommend Fernox Express or Superconcentrate Leak Sealer F4 products for all pressurised systems as they can be easily added via a radiator in a few minutes, without draining out any water.