The Fernox FM1 Stainless Steel Dosing Pot is a pre-assembled dosing vessel engineered for the safe and precise introduction of chemical treatments into closed-loop heating and chilled water systems without the need for system shutdown. It enables safer and more accurate dosing in commercial systems thanks to its extra-large tundish and supports compliant maintenance in line with BSRIA BG50/2021. Supplied as a complete package, the unit includes isolation valves, drain/fill valves, air release valve, and wall mounting bracket ready for immediate installation.
Safe, pressurised chemical dosing into closed-loop heating and chilled water systems without system shutdown.
Supplied assembled as a complete package with flow/return isolation valves, tundish, drain/fill valves, air release valve, and wall-mounting bracket.
Built-in safety valve prevents accidental fluid release under pressure.
Extra-large tundish enables safer, easier, and more accurate dosing.
Eliminates dead-legs in line with BSRIA BG50/2021 for compliant maintenance.
Stainless steel construction, available in 5, 10, 15-litre sizes.
The dosing pot should be installed between the flow and return pipework at a point with the highest differential pressure. Prior to dosing, the unit must be isolated and fully drained using the included valves. Chemicals are then introduced through the tundish, and reintegration is completed by gradually opening the isolation valves.
The Fernox FM1 Stainless Steel Dosing Pot is suitable for both heating and chilled water systems and fully compatible with all Fernox chemical treatments.
Product Details
Warranty:
2
Years
The Fernox FM1 Stainless Steel Dosing Pot provides a secure, reliable method for introducing water treatment chemicals such as inhibitors and biocides into sealed heating or cooling systems. Its corrosion-resistant stainless-steel body ensures durability and compatibility with all Fernox water treatment products.
Each unit is delivered pre-fitted with key components, including isolation valves, a drain and fill valve, air release, and a wall-mounting bracket. The extra-large tundish supports accurate chemical pouring, and the built-in safety valve prevents pressure-related accidents during maintenance.
Physical Specification / Properties
Body Material: Stainless steel (AISI 304)
Connections: 1” (25 mm)
Capacities Available: 5L, 10L, 15L
Fittings Included: Flow and return isolation valves
Drain/fill valves
Air release valve
Extra-large tundish
Wall-mounting bracket
Safety Feature: Integrated pressure relief valve
Tested: Hydrostatically individually tested to 16 bar for quality assurance
Package, Handling & Safety
Each Fernox Dosing Pot is supplied fully assembled and pressure-tested. Full installation instructions are included. As a pressurised vessel, it must be isolated before opening. Handle with care when adding chemicals and always follow relevant safety guidance. No special storage requirements.
Performance
Maximum Working Pressure: 10 bar
Maximum Operating Temperature: 0 – 110°C
Compatible Fluids:
Water
Inhibited glycol solutions (up to 50%)
Fernox inhibitors, biocides, and cleaners
Dosing While System is Live: Yes (via isolation and reintegration process)
