System Filters

Keeping your boiler working efficiently 

Damaged boiler and system components

Contaminated system water is a serious problem for homeowners. Central heating systems can quickly be damaged by a wide range of unwanted system deposits when the system has not been thoroughly flushed and inhibited. Harmful deposits can range from tiny particles such as magnetite and limescale to larger solder debris and non-ferrous metal flakes. They can quickly cause blockages and/or damage to key components within the boiler and heating system. Heat exchangers can also become blocked by the system contaminates, while components such as pumps and valves will also suffer, increasing the chance of system failure.

Reduced efficiency

When a system is not protected, a build-up of iron oxide (rust) or non-magnetic deposits can occur within just 3 weeks, resulting in significant energy efficiency losses and fuel wastage. This reduction in efficiency can reduce a boilers SEDBUK efficiency rating from band A down to band D. Such a reduction causes the boiler to work harder when trying to deliver the desired temperature, further increasing the risk of component failure. Within a non-filtered system, radiators can become blocked, reducing the heat transfer from the system into the property. This dramatically affects the efficiency of the central heating system and the heating comfort the homeowner receives. With a Greenstar System Filter, homeowners can save up to 6% per year on heating energy bills* whilst also benefit from a warmer home and a quieter heating system. A Greenstar System Filter will also help protect the environment by reducing a home’s CO2 emissions.

Powerful internal magnet

At the centre of this innovative design is a highly powerful internal magnet that removes the metallic debris that is present in the system heating water. The central location of the magnet within the system filter ensures that magnetite is collected quickly and retained, maximising the overall protection of the heating system. The Greenstar System Filter has been extensively tested in systems proving its effectiveness in removing: iron oxide, magnetite, limescale, casting sand, welding debris, non-magnetic metal flakes, paint particles and other system pollutants. The filter has been specified, designed and tested to Worcester’s exacting quality standards. For example, the
O-rings are specified using the same compounds that are found on our market leading boilers. The robust filter body has been pressure tested to 45 bar.

High first pass collection of debris

Any non-magnetic debris is caught by the twin-action cyclonic trap, a proven technology that offers a capacity to collect up to 200g of magnetite a year

Effective cylindrical design

The effectiveness of the Greenstar System Filter is based on its innovative cylindrical design, which allows the maximum possible surface area of the magnet to be exposed to the heating system water.

This cylindrical shape channels the water in an upwards spinning motion, assisting in the twin-action filtering process, whilst also providing a large capacity for captured system pollutants. Maximum debris collection through cyclonic motion As the diagram demonstrates, the Greenstar System Filter leads system water directly to the highly powerful magnet that is integrated inside. This has the effect of forcing water around the magnet causing the water to move upwards in a cyclonic motion. This motion maximises the contact of the system water with the magnet, whilst also increasing the time that the water remains within the filter. In this process, any magnetic system pollutants or debris will be drawn on to the magnet sheath and will remain there until the filter is cleaned.

Non-magnetic debris gets forced over the cyclonic trap which has specifically designed surface inlets that allow both small and large particles to be trapped within the base of the filter. Importantly these inlets are designed in-line with the spinning motion of the system water flow, ensuring no particles escape back into the system.

Spirotech MB3 Filter

SpiroTrap MB3 prevents the build up of dirt contaminating your central heating system helping to ensure that it is operating at its maximum efficiency.

Features & Benefits:

  • Highly recommended for all types of boilers, especially high-efficiency boilers.
  • Unique dual action - automatically and continuously removes both magnetic and non-magnetic dirt from the heating system.
  • Proven to improve energy efficiency by independent testers.
  • Helps to reduce running costs.
  • Helps to protect and prolong the life of components such as the boiler & radiators.
  • Helps to reduce nuisance call outs by eliminating problems caused by circulating dirt.
  • Slim design fits neatly on any pipework.
  • Easily cleaned during the heating systems annual service.
  • Simple and easy to install.
  • Guaranteed for life of the boiler to a maximum of 20 years.

Greenstar System Filter 22mm & 28mm

The Worcester Greenstar System Filter has been specifically designed to combat the damaging effects of system debris and pollutants by capturing contaminants before they reach your boiler.

  • Longer boiler lifespan
  • Can help to reduce system running costs
    Independent research carried out by GASTEC at CRE
  • Increase the comfort and efficiency of your heating system

Magnaclean professional

Proven technology to guarantee central heating system protection

  • Effective magnetic and efficient non-magnetic filtration
  • Simple installation and effortless servicing saving time and money
  • Immediate results and system protection cutting heating energy bills by up to 6% a year
  • Long operational life AND guaranteed for TWO years
  • Reduced carbon emissions
  • MagnaClean Professional 22mm available in black and white

MagnaClean Micro 2

Whether you’re fitting a MagnaClean® Micro2 on a brand new boiler or retrofitting it on an existing boiler, get the installation right to give the boiler the best protection. 


  • 6% annual saving on heating bills
  • Immediate ongoing central heating protection
  • Extends the life of the central heating system
  • Reduced carbon emissions
  • 10 year warranty