Power Flushing

Do You Need A Power Flush In Hereford?

We are local power flushing professionals who resolve central heating system issues that related to sludge, scale and other sediments throughout Hereford and the local area. We are regularly solving problems for customers who have poor performance issues with their heating and damage that has been caused to boilers and systems by sludge, sediment and limescale formation.

Central heating sludge and other sediments ruin boiler and central heating system components. Sludge drastically reduces the lifespan of components and can cause lots of other issues, resulting in significant increases in the maintenance required of a central heating system and the associated costs. In addition, sludge and other sediments reduce performance and boiler efficiencies.

Power flushing required skill to do correctly. We have witnessed consumers pay multiple times for power flushes as it was not done correctly the first, second or even third time! You really should only have to pay once, but you need the right person for the job!

So Why Use Us?

  • We are highly experienced power flushing experts
  • We work to fixed prices
  • We are punctual and keep our appointments
  • We provide a high-quality service

What We Offer:

  • A professional service
  • Excellent value for money
  • Durable heating systems
  • Tailored solutions to your needs

We offer a complete range of solutions and will always advise you on the best course of action which will keep your total costs down, not just with initial costs. We only want to install central heating systems which have minimal maintenance requirements and will be as cheap to run as possible.

Check around the internet about us, you will find quality reviews and examples of what we do all over it. We are transparent, honest and take pride in not screwing the customer over.


“Sludge and scale are the leading cause of premature boiler and heating system failure. Any boiler that beats the lifetime statistics usually has clear system water within it that contains inhibitors, whereas boilers that are regularly having issues will almost always have dirty system water. There are a large number of heating systems that would benefit from a power flush, potentially saving the owners a lot of money in the long run.”

How Does Power Flushing Work?

Power flushing uses a machine with a large pump that moves water around a central heating system at high-velocity, but at low-pressure. This machine is called a power flushing machine.

The machine circulates chemicals mixed with water at a high-velocity around a heating system to break down unwanted matter, such as flux, central heating sludge and limescale and then remove these sediments from the system through purging or filtering.

A power flushing machine works best when connected through the central heating systems pump. Sometimes other points can be used to connect onto, such as those on a filter or boiler jig.

Power flushing through radiator tails is not the best course of action. It is not always possible to avoid, but not a preferred method as it can be less effective.

Microbore Pipework

Microbore pipework has narrow a waterway that restricts water flow. It reduces power flushing performance as water cannot circulate at a more effective rate. We have power flushed many central heating systems with microbore with great success. However, due to the reduced flow, it is not always possible to remove all the sludge, and some dirty water and sludge deposits may still exist in the low parts of the radiators post flushing.

Lock-shield radiator valves that have built-in drain offs make it much easier to flush the radiators out of such matter.

Non-removable sediments

In new-build properties, extensions and renovations, where poor installation practices exist, it is possible for building matter, such as dust, sand, cement and plaster to get into open-ended pipework. If severe enough, these can block pipework solid and prevent power flushing from being successful.

Where this is suspected, it is often best to cut out the affected pipework, if the location is known, and then power flush the system afterwards. Power flushing, even with strong chemicals, is not effective against hardened cement, mortars or plasters.

Feed & Expansion Tanks

Conventional heating systems use feed and expansion (F&E) tanks to maintain water levels within a conventional central heating system, as well as accommodating the expansion of water.

F&E tanks collect matter from the loft when their lids are missing and are prone to microbial growth. Sludge can also make its way into the tank. These tanks should be cleaned out where-ever practically possible to prevent the unwanted matter from re-entering the heating system.

Can Power Flushing Cause Leaks?

Power flushing does not cause leaks, but where fittings and equipment have not been correctly jointed, such as unsoldered fittings and loose compression fittings, or where sludge, scale or sediment is plugging a breach in the system, such a split or corroded radiator, the water can pass following a power flush, thus leaving a leak.

Is Power Flushing Effective?

Power flushing is the best method to-date for resolving issues with central heating sediment. It is highly effective and has high success rates when done correctly.

Common Problems Caused By Sludge/Scale/Sediment

Conventional systems:

  • Radiators heat up when the system is set for hot water only
  • Hot tap water getting scalding hot
  • Hot tap water failing to heat up
  • Reduced pump life
  • Reduced motorised valve life
  • Kettling from the boiler
  • Overheating of the system
  • Cold spots in radiators
  • System water “pumping over” into the F&E tank
  • Thermostatic radiator valves failing to work

Combination (Combi) boilers:

  • Radiators getting warm when systems demand is for hot water only
  • Hot tap water getting scalding hot
  • Hot tap water has fluctuating temperatures
  • Hot tap water failing to heat up
  • Reduced pump life
  • Kettling from the boiler
  • Overheating of the system
  • Cold spots in radiators
  • Thermostatic radiator valves failing to work

Testing Water Samples

Testing methods such as turbidity tests, TDS meter readings, temperature differentials, visual indications and experience used in combination is the best way to identify sludge, limescale and sediment related issues.

What exactly is causing the issue cannot always be known for definite. Sludge is usually apparent due to its colour and tendency to discolour the central heating water. The only way to know precisely what is in the system water is to use a lab test, which is rarely used in domestic situations due to costs.


Following a power flush, inhibitors are added to the system water to reduce the corrosion process. Good-quality inhibitors will do this well, plus there are additional products to deal with microbial growths and limescale.

We prefer Fernox, Sentinel and Adey products as they have always worked well for us.

Frequently Asked Questions

Yes, but not with acid-based chemicals! Aluminium reacts readily with acids and strong alkaline, thus less effective compounds must be used, or the boiler needs disconnecting from the heating system where acid-based chemicals need to be used.

It is very high, 99% of the time it will resolve the issue(s) without any further work. However, it will not be fully effective in certain situations.

The process its self will not create leaks, but where components within the heating system are being held together by debris, the removal of the debris can result in parts weeping/leaking. These situations are rare, and where it does happen, it is usually a weep on such things as radiator valves.

Areas Around Hereford That We Cover

  • Creden Hill
  • Madley
  • Breat Brampton
  • Didley
  • Kingsthorne
  • Bolstone
  • Hampton Bishop
  • Dormington
  • Stoke Edith
  • Burley Gate
  • Canon Pyon
  • Bodenham

See all the areas we cover here!