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DPJ PHG Ltd Heating System Flushing Disclaimer

Central heating system flushing


The core component of a heating system is the boiler. When a boiler is renewed, the boiler manufacturers’ Benchmark scheme requires that the system be thoroughly cleansed to the BS7593:2019 Code of Practice. We currently offer 3 different types of heating system flush:

  • MagnaCleanse - Less aggressive on the system, suited for fairly clean to somewhat dirty systems

  • Water Mains Flush - More aggressive on the system, suited for bad systems. Multiple radiators with cold spots

  • Powerflush - Very aggressive on the system, uses a pump to force water around the system to remove debris


The flushing equipment is temporarily connected to the heating system during the flushing process. The aim is to dislodge and mobilise sludge and corrosion deposits.


Having loosened the debris, the flushing equipment expels it from the system to waste.


Radiators are individually flushed without removal or disconnection from the system. After the flush, the system is full of clean water, and reinstatement to normal operation takes only a few minutes.


A flush can be extremely effective in cleaning systems that have corrosion problems as a result of a design fault, but we strongly recommend that any such design faults be rectified before power flushing commences.


The success of a flush will depend on the level of heating system corrosion that has occurred beforehand. The process will cure most circulation problems, but cannot undo the corrosion and gradual decay that has led to the need to flushing the system.


Whilst it is rare for a heating system to experience leaks after the flushing process, it is not possible to inspect a system internally beforehand, and the need to use a flushing and dispersing chemical (see Part L of the Building regulations) for effective cleansing means that occasionally we may find a leak.


The advanced stage of corrosion required for such a situation means that the leak would occur imminently even without a flush. We believe that it is better that it occurs whilst we are present to remedy the problem, rather than for it to arise over a weekend or whilst the house is unoccupied.


Systems that have been neglected over a period of time, or have not been treated with an effective corrosion inhibitor, may have severely compacted corrosion debris, in the pipework, radiators, or boiler, and it is possible that even after the power flush, some radiators may still not be fully effective, or boilers on the margin of failure may cease working due to sludge and debris later breaking loose and collecting in the heat exchanger.


PLEASE NOTE: The vast majority of power flushes that we carry out are without problem, and result in a cleaner and more efficient heating system, with radiators restored to their original output.




The price/quote that we have stated allows for Central Heating Flush only, and we will carry this out to best industry practice, according to BS7593: 2019. However, if any of the above or similar unpredictable problems arise during or after the flush we will not hold ourselves responsible in any way, and any further work required would be carried out at an additional cost.

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