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[Shackeng]

https://www.hss.com/hire/p/central-heating-flusher  £80 a day.

I know...I saw your reply before.....but tbh I wouldn't how to connect it.....it must surely need pipes cutting.....

Nope, connects to the normal plumbing fittings, when I had one it came with all the adapters and instructions, but you have to buy the chemical. If you speak to them, they are very helpful. If you can work on your car, you can use this.

[Marks DTM Calib]

Its still cheaper to add a few isolators and t-pieces.....should you be inclined to go down the power flush route. 

Plus that is very pricey, typically about 40-50 per day from the local hire shops if you ring around.

[Kevin Wood]

I just took off the radiator closest to the back door and used a couple of plumbing fittings to connect a hose pipe to each end. An outside tap connector of the correct size will screw straight on to a radiator valve. By opening and closing valves and thinking about how the system works you can direct the flow around the whole system and also through one radiator at a time for more effective cleaning.

Pop a bung in the feed and bleed pipes at the expansion tank first, though.

[TD]

My mums central was sorted yesterday....

Power flushed for about 5 hours .....

Plumber used a rubber attachment that fitted onto a hammer drill to 'tap' the bottom of the rads....it basically hammered the bottom of the rads to get the sludge moving...

Upon removing the magnets from the power flusher at the end, his comment was 'kin ell, never seen so much sludge'.
There must have been good inch of sludge (radius) covering the magnets (two of them, each being about a foot long)

It needed a new pump, as that had packed up sometime in the last week or so.

He also fitted a magna clean as well....

Total cost £375 including all the chemicals he used... so not too bad considering .... and lovely hot rads again