Water mist fire extinguishers, UK manufactured, UK delivery Puts the fire out. Leaves the room intact.
De-ionised water, forced through a fine misting nozzle: a cloud that smothers the flame and cools the fuel, then leaves almost nothing behind. No powder to clear, no foam film, no service contract. Built in Norfolk by Britannia Fire, delivered and commissioned UK-wide by TristarFS.
A powder discharge can cost more to clean up than the fire cost to burn, and every steel extinguisher on the wall is a recurring invoice besides. A P50 water mist unit is commissioned once, checked in-house by your own staff, and leaves almost nothing to clear up.
Two units. Two different jobs.
These are not the same extinguisher in two sizes. The smaller unit covers more fire classes; the larger one puts more water on a bigger Class A fire for longer. Which you need depends on the risk, not the room size.
The broad-cover compact
Rated 8A 5F: carbonaceous fires, cooking oil fires and live electrical equipment to 1000V, in a unit light enough for anyone on site to lift. The natural choice for homes, HMOs and rental properties, small kitchens, offices, server rooms and heritage interiors where residue is the real risk.
The bigger Class A answer
Rated 13A, with a 40 second discharge and 4m+ range for larger carbonaceous risks: storage, offices, communal areas, education. Safe on live electrical equipment to 1000V. It carries no F rating, so where cooking oil is part of the risk it needs pairing with a P50WM2 or a dedicated Class F unit.
Twin magnet-tested indicators
Two independent pressure indicators, verified in seconds with the testing magnet stored in the base. Needle returns to green. The unit is live.
HDPE wound in Kevlar®
An HDPE core wrapped in aramid yarn with a UV-protected outer casing. It can't corrode or dent, at 55 bar minimum burst pressure on a 12 bar working charge: indoors, outdoors or coastal.
De-ionised water, atomised
The misting nozzle breaks the charge into droplets fine enough to hang in the air around the flame, smothering it while stripping out heat. De-ionised, so it's safe on live electrical equipment to 1000V at 1m, with next to nothing left to clean up.
EPDM hose & misting nozzle
Fully recyclable at end of life
Built for the worst two minutes.
Your own staff are your engineer.
Check the indicators
Both pressure indicators should sit in the green segment. If either shows red, the unit goes back to us as your distributor.
Check the tamper seal
Confirm the seal and pin are in place. A missing seal means one phone call to TristarFS, not an engineer contract.
Run the magnet test
Wipe the unit down, take the testing magnet from the base and pass it across each indicator. The needle should move, then return to green.
Confirm the date
A colour-coded stud in the base gives the year of manufacture. At year 10, one manufacturer overhaul extends the lifespan another decade.
Log it
Record the inspection date in your fire logbook and mark the body. Done for another year.
A simple workplace check, not an engineer visit.
The annual P50 inspection is the same on both models, and can be completed and recorded by a trained member of your own team.
Two minutes per unit. Once a year.
Every P50 we commission (either model) comes with the logbook, staff walkthrough and written procedure for your fire risk assessment.
Book your free evaluation →Both units, side by side.
| Specification | P50WM22L Water Mist | P50WM66L Water Mist |
|---|---|---|
| Capacity | 2 litres | 6 litres |
| Fire rating | 8A / 5F | 13A |
| Fire classes | A · F · Electrical | A · Electrical |
| Full weight | 2.8 kg | 8.5 kg |
| Height | 430 mm | 570 mm |
| Diameter | 127 mm | 178 mm |
| Discharge duration | 18 secs | 40 secs |
| Discharge range | 3 m | 4 m+ |
| Pressure @ 20°C | 12 bar | 12 bar |
| Temp range | +5°C to +60°C | +5°C to +60°C |
| Extinguishing agent | De-ionised water mist | De-ionised water mist |
| Electrical safety | 1000V at 1m | 1000V at 1m |
| Certification | BSI Kitemark, UKCA, EN3, PED | BSI Kitemark, UKCA, EN3, PED |
Where Can You Use A P50 Water Mist Extinguisher?
P50 water mist extinguishers can be suitable for premises where Class A risk is present and a low-residue discharge matters, subject to the ratings on the unit and the site’s fire risk assessment.
Offices
Furniture, paper and equipment are Class A risk, and a mist discharge leaves no powder for anyone to clear off a hundred desks afterwards. Suitable models are tested for use on live electrical equipment up to 1000V. Check the rating on the unit against your own assessment.
Server & Comms Rooms
Rooms where the clean-up can cost more than the fire. De-ionised water is used precisely because of what it leaves behind: as little as possible.
Schools & Public Buildings
Classrooms, corridors and halls are largely Class A risk. A unit needing no annual engineer visit is one fewer contractor booking in the school calendar.
Hotels, Care Homes & Residential
Occupied buildings where a powder discharge would be disruptive to clean, and where the same specification is usually repeated on every floor.
Heritage & Sensitive Interiors
Galleries, museums and listed interiors, where what an extinguisher leaves behind is as much of a consideration as what it puts out.
UK Manufactured.
Neither unit is assembled from imported parts. The whole P50 line is designed and manufactured by Britannia Fire in Norfolk, England. Every cylinder is wound, charged and tested before it leaves the factory floor.
Engineered in Norwich
Composite technology developed and refined across the whole P50 line by Britannia Fire, a British manufacturer, not an importer.
Every unit, before dispatch
Each cylinder is wound in aramid, pressure-charged and individually tested at the factory in England.
UK-wide delivery
Either model, any mix, supplied anywhere in the UK by TristarFS, with siting and commissioning available nationwide.
The maths does the selling.
The purchase price is where a steel extinguisher's costs start. It's where a P50's stop, and that's before you count what a powder discharge does to a server room or a gallery.
Ask before buying.
Straight answers on how water mist works, which unit suits which risk, servicing, lifespan and delivery. Anything we haven't covered, book a free evaluation and ask in person.
01How does a water mist extinguisher actually work?
02Which one do I need: the 2 litre or the 6 litre?
03Why does the smaller unit cover more fire classes than the bigger one?
04Does it leave residue or damage equipment?
05Do they need an annual engineer service?
06Are they British made?
07Do you deliver and install across the UK?
Fit it. Forget it. For ten years.
Every P50 from TristarFS arrives British-built, with the inspection procedure and logbook included and commissioning available UK-wide: whether that's two units or two hundred, in one model or both.
Evaluations are free and without obligation