Purchase your copy of BS as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards available. Power Flushing for central heating systems Compliance with Building Regulations Part L (BS ). Products. CalFlush Power Flushing Unit. by a new boiler. Many boiler manufacturers now make the warranty dependent on flushing and cleaning in accordance with BS, Benchmark and Part L.

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Please download Chrome or Firefox or view our browser tips. Your basket is empty. Not all systems will have a connection to a supply of mains water however, and even those that do i. Aerobic bacteria, fungi and slimes which have developed in the cistern can enter the system with the make-up water and produce debris. There is a British Standard document BS Now to do this procedure properly takes a little time usually about a day for a 4-bed house.

Back in the old days this wasn’t a problem as the heat exchangers had large passes through them so the sediment etc just flushed through. Under no circumstances should the system be left empty for extended periods as this could accelerate corrosion of ferrous components like radiators. Scale formation will be most pronounced if there is a high rate of water loss from the system, requiring frequent addition of fresh water to the system.

Customers being ripped off – Power flushing.

If the system is correctly maintained, well designed, and foushing treated with a corrosion inhibitor, then it is unlikely to need deliberate flushing until significant changes are next made to the system.

To do this, first isolate the rad with the valves either side, and then drain into a suitable tray by partially undoing one of the rad valve unions to the radiator. Such debris can cause blockages and is liable to foul the boiler heat exchanger. The vibration combined with the flow of the flushing water helps free more sludge that may have settled and congealed in the radiator. Here the temperature conditions are more favourable for bacterial growth and there is contact with the air.


Microbiological organisms range from simple bacteria to fungal and yeast spores. Yes, my password is: You may find similar items within these categories by selecting from the choices below:.

Benefits For fast, effective cleaning of central heating systems Removes sludge, scale, silt, corrosion, oil, grease and flux Prevents boiler noise Improves energy efficiency therefore reducing fuel bills Prevents boiler bs753 heating system breakdown Robust CalFlush machine designed for repeated use. ICOM publishes new guide for commercial applications. Before cleansing, the system should be examined to determine the system configuration and the age and overall condition of components, in order to ascertain the cleansing regime required.

The importance of flushing – Heating and Ventilating

The standard also gives guidance on the preparation of the primary circuit of wet central heating systems flushihg to initial commissioning or re-commissioning following major remedial work e. Some systems allow the boiler to be operated at the same time, others may include some heating capacity of their own. When water is heated, insoluble calcium carbonate f,ushing formed which can then come out of suspension to form deposits on surfaces within the system this often referred to as “lime scale”.

Its there decision take it or leave it? Inhibition devices should be installed in the system pipework after the final flush and before the final fill with fresh water. You must log in or sign up to reply here. As for power flushing we do it if they want us to!

Powerflushing is a particularly effective method of cleansing existing systems, especially those containing a high level of black magnetite sludge.


BS 7593:2006

Personal tools Log in. If you slap a new boiler onto an old system potentially these contaminants can end up returning to the boiler and blocking the heat exchanger. I’m beginning to think I should pack this in and become a power flusher.

While there are many companies that specialise in offering this service, it is also possible to hire the equipment and do it yourself. Over time, scale, sludge and corrosion builds-up in boilers, pipework and flushig, gradually reducing central heating system efficiency.

These will typically include adding an appropriate cleaning chemical to the working system and running it normally for a rlushing prior to the actual flushing. Hence it is often worthwhile making up some adaptors to enable a hose to be connected to the tails of a radiator. Nowadays all systems use tiny heat exchangers with passes of less than 3mm wide which can easily be blocked.

Central heating flushing – DIYWiki

Central heating with zone valves. Lying customers crap installs Bunnyman15 Aprin forum: Rather than flushing all radiators in place, its also possible to use the “hosepipe method” to flush an individual rads that are giving indications of being badly sludged. If it is possible with your flushing vs7593, repeat the flushing process with the flow in the opposite direction.

It is one of the aspects of “Water treatment” required at certain times to maintain the correct working of a heating system. Thus by removing a radiator and then connecting to either the flow or the return tail and capping or shutting off the other tail!

Scale in the heat exchanger will have a detrimental effect on boiler heat transfer efficiency.