HVAC Protector F1 2.6 & 55 gallon

Product Code: 59700, 59851

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Central heating system inhibitor is suitable for all mixed metal, light commercial and HVAC heating and cooling systems.


This proven central heating system inhibitor is suitable for all mixed metal, light commercial and HVAC heating and cooling systems. It provides long-term protection against corrosion, sludge, limescale build-up and bacterial contamination. . It has been awarded approvals and accreditations from ESTR, BuildCert, KIWA and Belgaqua for its effective and environmentally friendly formulation.

  • Central Heating Protector for mixed metal commercial and HVAC heating and cooling systems
  • Renders water non-corrosive to steel, cast iron, copper, brass and aluminium
  • Prevents limescale build-up
  • Maintains efficiency so extending system life
  • Prevents bacterial contamination
  • Compatible with all metals and materials commonly used in heating and cooling systems
  • Non-toxic, environmentally friendly
  • One 2.6 gallon bottle treats  500 gallons of water and one 55 gallon bottle treats 10000 gallons of water
  • 2.6 gallons – 59700
  • 55 gallons – 59851
  • Buildcert
  • kiwa
  • ISO14001
  • kiwa


The recommended in-use concentration of the product is 0.5%. Fernox HVAC Protector F1 can be introduced into the system via the feed and expansion tank or injected directly into the system via a suitable point (e.g. dosing pot). To ensure speedy dispersion, partly or completely drain down and introduce HVAC Protector F1 whilst refilling. In single feed indirect cylinders, e.g. “Primatic” or similar, potable water chemicals must be used. We recommend untreated systems are thoroughly cleansed and flushed using Fernox HVAC Cleaner F3 before treating with Fernox HVAC Protector F1 as existing debris can damage the installation.

Physical Properties

Colour: Light yellow
Odour: Aromatic (faint)
Form: Clear liquid
pH (conc): 8.0
pH (0.5% soln): 7.4 – 8.2
SG: 1.10 at 68°F

Packaging, Handling and Storage

Fernox HVAC Protector F1 is supplied in 2.6 and 55 gallon containers. Fernox HVAC Protector F1 is classified as non-hazardous but as with all chemicals: Keep out of reach of children. Do not mix with other chemicals. Do not take internally. May produce an allergic reaction. Contains 1,2-benzisothiazol-3H(2H)-one. In case of contact with eyes or skin, rinse immediately with plenty of water.