Thanks for all the repies so far, turned into a hot potato really me thinks.
My point is simple, who is going to tell me that a power flush is hard work? - once the unit is connected to the system, what is hard about it, nothing, so all i am saying is
why should there be an excessive charge for doing it?
I have been in this game for 30 years, and i have to laugh at some of the comments such as "often there is no need for a powerflush" - on a sealed system i am in agreement to some extent, but when it comes to open vented systems/gravity, (or conversion of) that can be another story.
We all have come across systems that have been installed by idiots i am sure, so (for example) you come across a system where it has been pumpng over, or the pump has been sucking in air via the open vent, would you expect any power flush to be necessary in that case.... i dont even have to have a look at the job....it will need a power flush!
After market magnetic filters are being sold as the be all end all, RUBBISH, these filters rely on the ability of the circulator being able in the first instance to 'move' the magnetite past the magnets, show me a domestic circulator that will do this on a drop feed system...They cant! - these filters can only filter out what is in suspension within the heating system thats all. - FACT!
So poor Mr jones whos rads are blocked up is being sold a piece of equipment that will not do the job, why because of the explanation already given.
That is where a power flush comes into it's own, and as stated many times, a power flush is the best option (bar a repipe) to resolve a sludged up system.
I have been in many situations (before power flush units came out) when two of you are carrying a huge great rad out side (house has beige carpets - why is that?) to run a hose pipe through it while trying to shake it!...Not good, oh and this is two weeks later after having been there to add 'super floc' into the system..... get my drift?...that is hard work.
Power flushing units came along, and to me my faith in god being a plumber was restored!
Some of you reading this post will not of done anything than a combi, so for those....please, spare me your wisdom!!