High-Performance Side-Stream Filtration for HVAC Water Systems with X-POT

Optimise your HVAC water quality with VEXO’s advanced side stream filtration solutions, designed to remove suspended solids, biofilm, and debris from closed-loop or sealed water systems. By continuously filtering a portion of the system’s water, our side stream filters help prevent blockages, reduce corrosion, and enhance heat transfer efficiency, ensuring your heating and cooling systems operate at peak performance.

VEXO offers a complete range of X-POT side stream filtration units, combining the functionality of a dosing pot, air and dirt separator, magnetic filter and cartridge or bag filter. Our X-POTs are engineered to prolong equipment lifespan, lower maintenance costs, and improve system energy efficiency by keeping your hydronic circuits free from contaminants.

Discover how VEXO’s X-POT side stream filtration technology can help you maintain a cleaner, more efficient HVAC water system—reducing downtime and optimising system performance.

Our X-POT Range

A VEXO X-POT Compact, a stainless steel cylindrical device used for water treatment in heating and cooling systems. It features multiple green-handled valves, inlet and outlet pipes. The unit is wall-mounted with visible brackets and designed to improve system efficiency by removing air, dirt, and debris.
X-POT Compact
A VEXO X-POT 6, a stainless steel cylindrical device used for water treatment in heating and cooling systems. It features multiple green-handled valves, inlet and outlet pipes. The unit is wall-mounted with visible brackets and designed to improve system efficiency by removing air, dirt, and debris.
X-POT 6
A VEXO X-POT 6+ Side Stream Filter, featuring a cylindrical stainless steel body with multiple valves, pipes, and connectors attached. The filter is mounted vertically on a black panel, with an integrated pump, pressure differential monitor and fittings designed for industrial fluid management systems.
X-POT 6+
VEXO X-POT XP A cylindrical stainless-steel multi-purpose filtration unit with various valves, including green VEXO-branded handles, a pressure gauge, and a brass air vent at the top. The unit is designed for heating and cooling systems, integrating magnetic filtration, dirt separation, and chemical dosing in one compact device.
X-POT XP
VEXO X-POT XP+ A cylindrical stainless-steel multi-purpose filtration unit with various valves, including green VEXO-branded handles, a pressure gauge, an integrated pump, pressure differential monitor and a brass air vent at the top. The unit is designed for heating and cooling systems, integrating magnetic filtration, dirt separation, and chemical dosing in one compact device.
X-POT XP+
VEXO X-POT XXP A cylindrical stainless-steel multi-purpose filtration unit with various valves, including green VEXO-branded handles, a pressure gauge, and a brass air vent at the top. The unit is designed high flow high pressure heating and cooling systems, integrating magnetic filtration, dirt separation, and chemical dosing in one compact device.
X-POT XXP
VEXO X-POT HFHP, a tall, polished stainless steel high-flow, high-pressure filtration vessel. It stands on four sturdy legs and features a large flanged side inlet. The top has a secure bolted lid with multiple access ports, sensors, and valves for monitoring and maintenance. The conical bottom design aids in efficient debris collection and discharge.
X-POT HFHP

What is an X-POT?

The X-POT is an award-winning, patented side stream filter that maintains systems in accordance with BSRIA BG 29/2021 and BG50/2021. Highly specified since 2013, X-POTs have multiple benefits such as:

  • Saving plantroom space with multi-functional design.
  • Improving system life expectancy and saving on capital expenditures.
  • Enhancing system water quality leading to increased efficiency, significant energy savings and less operating expenses.
A digital illustration showcasing various filtration systems, including magnetic filters, dosing pots, dirt and air separators, cartridge & bag filters, and an all-in-one VEXO X-POT solution.
The X-POT combines most current system filtration units into one easy install, easy-service, BSRIA acknowledged water conditioning product.

Why do you need side stream filtration on a closed loop system?

Water is the main means of closed system temperature distribution. It affects every single piece of equipment and every single person in the spaces that you manage.

Wherever there is closed loop system water four problems will occur: scale formation, corrosion, fouling and microbial growth.

Limescale deposits can clog up your heating or cooling system. Biofilm sludge or particles of rust and scale can also cause blockages and cold spots in pipes and radiators. All of this leads to reduced efficiency and high fuel bills. It also means extra stress on pumps, heat exchangers, radiators and sensors causing the risk of breakdown and inevitable expensive repairs.

Side stream filtration and a system water programme helps prevent all these issues. Filters reduce suspended solids and debris in the system water, which leads to less fouling. Decreasing suspended solids can also help reduce biological growth in the system because suspended solids are a good source of food for microbiological organisms. Decreasing biological growth in turn helps to reduce microbiologically influenced corrosion as well as scale formation.

An infographic showing how a heating or cooling system loses efficiency due to limescale, metallic sludge, and bacterial biofilm. Arrows connect a factory to buildings through contaminated pipes, with captions explaining that contamination leads to poor distribution, breakdowns, and energy waste.
If left untreated, dirty system water can increase your energy usage by over 10%.
Various costly MRI failures and warranty voids caused by blocked plate heat exchanger cleared up immediately upon installing an X-POT
Maine General HospitalUSA
Results suggest gas bill reductions up to 10% are possible whilst prolonging the life cycle of existing heating systems.
Dr Rayner MayerReading University
Our team would have no hesitation in recommending the VEXO X-POT range and have since advised our colleagues in our sister teams of the benefits of VEXO equipment.
Ashley NicholsonWSP Consulting Engineers
The X-POT® has been life changing. We have been able to get the best value in terms of temperatures and efficiency.
Christopher CollinsAbbeyfield Care Home
I personally specify it in as many projects as I can because of its multi featured and multi faceted benefits for the clients.
Michael Bergen JrAllen + Shariff MEP Engineering
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