how do i know that my rads need power flush?

This is a commercial site but it looks almost ethical...

http://powerflushassociation.com/faq.html

They suggest that all systems will get some benefit from a power flush but the big question is how much benefit?

Here British Gas seek to help you save money by spending £700 with them - ask yourself these questions...

Does this make sense?
Should I stay with British Gas?
What's the payback period if I have this work done?
Could I do it myself?

https://www.youtube.com/watch?v=NDZmBXXBxR8

Peccavi
February 2013

Unable to help you with the specific question but I have seen dozens of examples on here of outrageous Upselling by British Gas - Power Flushing particularly. I have followed the guy who wrote the article I copied for many years and have faith in the truth of what he says.

Check out the Search facility - Power Flush / British Gas - see what turns up.

Continuing good luck...

Peccavi
January 2013

hi thanks for reply do you know what the signs are that they would need a power flush as he water is clear

g clements
January 2013

From a newspaper...

http://www.telegraph.co.uk/property/propertyadvice/jeffhowell/7760467/Home-improvements-heating-system-powerflush.html

Unfortunately British Gas engineers have developed a reputation among readers for often recommending a powerflush, without necessarily having proved that one is required. Many readers have reported that – having paid extra for a powerflush – they have then found that it has not improved the performance of their central heating, and that other faults have later been found to be the problem.
I have been cautioning Sunday Telegraph readers since 2000 that British Gas engineers are given financial incentives to sell boilers, and other “chargeable extras”, such as the powerflush. British Gas has consistently denied that this is the case.

Follow link & read article...

Good luck...

Peccavi
January 2013