FlexEJ's UK designed and manufactured chemical dosing pots allow inhibitors to be added safely to closed HVAC heating and chilled water systems.

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Dosing Pots

All FlexEJ's chemical dosing pots are carbon steel vessels and manufactured in the UK by FlexEJ. Our dosing pots are available on a 24hr shipping basis from our web shop, 3.5 litre sizes up to 25 litres and at great direct prices too. We also design and build non standard capacities to order or as an OEM partner:



What is a chemical dosing pot?

Dosing pots allow liquid chemicals to be safely added to closed HVAC systems...

  • Materials
    Carbon steel with DN25 BSP connections.
  • Application
    Heating water and cooling water services, not suitable for drinking water.
  • Rating
    10 Barg @ 110°C.
  • Web Shop
    Available online with next day delivery from our web shop.

How to select HVAC system equipment

1 What goes where?2 Low Loss Headers3 Air & Dirt Separators4 Dosing Pots5 Need something a bit different?6 Let us help
HVAC systems helpAll these products are designed to protect and optimise your heating or cooling system. These products are normally positioned as follows:
Air or Air & Dirt Separator ~ boiler flow lines.
Dirt Separator ~ boiler return lines.
Dosing pots ~ main flow and return.
Low Loss Headers ~ between the boilers and system.
HVAC Low Loss HeadersA low loss header decouples the boiler from the system. This allows the boilers/boiler circuit flow to optimise at best efficiency for any system conditions. FlexEJ low loss headers come with sensor ports on all four branches so whatever control system is being implemented you will have the port you need.
HVAC Air & Dirt SeparatorsThese separators keep the system clean with both dedicated and combined units. Air causes corrosion and in extreme cases pump cavitation or air locks. Dirt will reduce boiler efficiency over time and will reduce flow areas in all equipment. Removing both air and dirt will keep the system running efficiently and avoid costly maintenance.
HVAC Dosing PotsDosing pots are used to safely introduce inhibitors and other chemicals into the flowing system. Maintaining the correct water chemistry ensures all materials in the boilers, chillers and system are protected from corrosion.
HVAC something differentFlexEJ can design and build large, multi-circuit low loss headers to order. We can also offer low loss headers with air and dirt sections and all products in larger diameters for bigger systems. Please let us know what you need.
Let FlexEJ help Call our HVAC specialists on +44 (0) 1384 881188 or email us at or use Live Chat on this web site - we are here to help, please get in touch.

Can't see what you want? Need help?

Call us. Or use Live Chat.

For instant advice. We can custom-design and engineer almost any expansion joint you need for delivery in the UK or worldwide. Call our expert team on +44 (0) 1384 881188. Or email us

FlexEJ's chemical dosing pots

FlexEJ manufacture these robust value for money chemical dosing pots in the UK. Capacities from 3.5 litres to 25 litres and all standard sizes are available on a 24hr dispatch basis directly from our web shop. FlexEJ can also manufacture dosing pots to meet specific client requirements, please get in touch.

Chemical Dosing Pot


All our chemical dosing pots have:

  • Drain, Flow and Filling valves all DN25 PN40
  • Non return valve
  • Carbon steel body
  • Carbon steel tundish
  • Air release ball valve
  • Wall brackets

It is important that the dosing pot is correctly attached to the system to allow rapid chemical feed. Choose a location near a main pipe run or system header. Don't forget to visit the web shop to check stock availability and direct pricing. For capacities and dimensions please see our catalogue or range tab above.

Got a quick question?

Use Live Chat. Or call us.

For instant advice use the Live Chat link to message one of the sales team. Or call them direct on +44 (0) 1384 881188

Frequently Asked Questions

Q. What connections do your dosing pots support?
All our stock chemical dosing pots come preconfigured using DN25 PN40 female-threaded ball valves. We can manufacture to other specifications but not from stock.

Please visit our full FAQ page to see all our frequently asked questions.

Can't quite find the right bellow?

Try the FlexEJ Bellows Finder

Or call our expert team on +44 (0) 1384 881188


Who can you talk to?

Try our sales and customer service team on 01384 881188

They don't bite. And they know what they're talking about. Call the team any time from 8:30am to 3:30pm weekdays, 12:30pm Fridays or use LIVE CHAT if you would prefer a quick text answer. For more complex queries, send us any pro-forma documentation using the get a quote form below or email us

Call Us

Need a detailed quote?

Get A Quote. On us.

We will provide full technical details together with, pricing and shipping timescales. For more complex engineered quotes, preliminary sketches and calculations will be available.

Got a quick question?

Use Live Chat. Or call us.

For instant advice use the Live Chat link to message one of the sales team. Or call them direct on +44 (0) 1384 881188

Get A Quote

Please complete the short form here and we'll get back to you within 24hrs Monday to Friday (quicker if marked urgent).

Alternatively, you can also call our expert team directly on +44 (0) 1384 881 118 from 8:30AM to 4:30PM weekdays (12:30PM Fridays), who will be only too pleased to talk through your requirements and technical queries over the phone.

Visitors are also welcome Monday to Friday although please get in touch beforehand to let us know you're coming.

    Please treat this enquiry as: UrgentConfidentialProvisional

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    Industry experience

    FLEXEJ Ltd was formed in 2002 by two professional engineers who brought together an already highly respected design capability with business and commercial skills gained in large multinational companies.
    • Our focus has always been on application and design – helping our customers find the best value solution.
    • We have a strong engineering and manufacturing team with experience in petrochemicals, refining, nuclear, desalination though to HVAC.
    • The team is also very familiar with meeting complex requirements for documentation, in process NDT and test on projects. We have supplied many large end-users such as EDF, Exxon, Shell, Reliance & QatarGas working with major contractors such as JGC, Foster Wheeler & Technip.
    FlexEJ Industry Experience