Why should I Powerflush??

Rust occurs in central heating systems producing a black sludge or Magnite, and in hard water areas lime scale builds up just like in your kettle causing the following problems.

  • Cold spots on radiators
  • Noisy pump
  • Pump failure
  • Blocked radiators
  • Radiators frequently needing venting & bleeding
  • Boiler noise
  • Heating circulation problems
  • System is slow to heat up
  • Reduced heating output
  • Pinhole leaks from radiators
  • Blocked inoperative or leaking radiator valves

When a new heating system is installed in your house, corrosion starts immediately.
The oxygen in the water starts to attack the radiators internally. This
chemical reaction eventually forms a black sludge (Magnite) that causes
problems such as boiler noise, repeated pump failures or poor circulation
and often all three!!!

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Sludge! (Magnite Deposits)

Commonly called "Sludge" Magnite deposits are the principle cause of system replacement. It is present in the majority of heating systems as a thin, black liquid. However, it is often thick and oily. At this stage it is highly damaging to a system's performance and will ultimately cause system failure if left unchecked.
The image to the left was taken whilst the Power Flush machine was dumping the dissolved "Sludged" from the system before the final flush with fresh water and corrosion inhibitor, this system was 10 years old!


What is Power Flushing?


Our Power Flushing Machine
Power Flushing is the process by which heating systems are forcibly cleansed using a chemical at high velocity, but low pressure, so that no physical damage is caused to the system. The objective is to remove sludge and corrosion deposits from the system which cause damage to the boiler and pump, slowing down circulation, leading to higher fuel costs. In our experience, power flushing can make a dramatic difference to the operating efficiency of most systems.
Where a new boiler is to be fitted to an older system, cleansing is of utmost importance in order to remove layers of Magnetite and in hard water areas limescale.
If this is not done a Hi Efficiency boiler with a SEDBUK A or B rating would be brought down to a C or D rating, making the installation impracticable and resulting in early failure of the boiler. This would not be covered by a manufacturer's warranty in these circumstances.
In order to give the system its full life expectancy, water treatment should always be carried out.

Some important things you need to know about powerflushing and why it is so important

Power Flushing is a rapid movement of water through the system, aided by the use of cleaning chemicals to remove deposits.
It is the only effective way to remove debris from the system.
Expelling the dirty water to drain and replacing with clean water from the mains supply, which can be done in either direction of flow.
After flushing the radiators the system water should be tested with a TDS meter and should be within 10% of the reading gained from the mains water.
The clean system is then ready for treatment with a corrosion inhibitor.
Without this treatment no guarantees can be given as to the life or efficiency of the system.

Who says so?
Building Regulations - Part L refers to the Domestic Heating Compliance Guide.
This states that the minimum provision in new and existing dwellings is


(a) Thorough cleaning and flushing out before installing a new boiler
(b) During final fill add the corrosion and scale formulation (Corrosion Inhibitor). Follow guidance given in BS 7593:2006
(c) Refer to boiler manufacturers instructions for appropriate treatment
(d) Where hardness > 200ppm, treat feed water to water heaters and hot
water circuit of combi to reduce limescale accumulation.
(e) Furthermore, many maintenance companies often insist that systems are powerflushed in order to maintain a cover plan.

The results of best practice The benefits of conducting Water Treatment / Powerflushing within Central Heating Systems: A quieter boiler because of the removal of lime scale build up on the heat exchanger.

  • Hotter Radiators and a quicker warm up from the removal of Black Sludge (Magnetite) and elimination of cold spots
  • A longer lasting system
  • Pumps will last longer and radiators will have an extended life if there is no corrosion present and suitable corrosion inhibitors are used
  • Lower fuel bills due to a more efficient system
  • It costs more to heat solid magnetite than it does water! Estimated that up to 25% savings can be made
  • Complies with The Benchmark Code of Practice exceeding the BS:7593 2006 standard when installing new boilers on old or new installations
  • A safer environment when under taking system cleaning
  • Self contained unit
  • No taking individual radiators of the wall and struggling to avoid getting black sludge on carpets etc


Please Contact Us for a free no obligation survey and quotation on 07772919035

iPlumb Heating Services have the solution!

Not only will we power flush and install the best product for you, but we will carry out an annual service and ensure that you have the best possible outcome in the future.

What if I want Boiler Breakdown Cover?

Most boilers come with an extensive warranty, it is not worth your money charging you for a premium, when the manufactures will cover all parts and labour in the event of a breakdown.
You would be better of saving that yearly premium for a rainy day.
What we will do is to ensure you have your boiler serviced annually.

What If I do not want Boiler Break Down Cover?

We will carry out a full annual service to your gas appliances, and in the event of a breakdown you will be charged at our hourly rates or on a price.

What boiler will you fit is it a cheap boiler?

We will only fit boilers with a stainless steel heat exchanger, usually the boiler is an Alpha or an Ariston., sometimes we will use a Viessman or Vailant, but that is dependant upon your unique situation.
Some boilers are manufactured with aluminium heat exchangers and are cheaper, but in our experience, we have seen that the corrosion from the aluminium and the condense has blocked the condense waste, caused problems with flueing of combustion products and have damaged the heat exchanger beyond repair. With Stainless Steel this should not happen.

Whats the next step?

Call us on 01256 520 999 or 07772919035 and arrange a FREE no obligation quotation to replace your boiler.