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The boiler is 1yr few weeks old BG supply and fit. British gas homecare fitted new fan after boiler was producing worrying noises. No cure so they called Baxi out who put the noise down to the heat exchanger and changed it finding a small amount of residue dirt in it. Now quiet boiler but gurgling radiators at the time of start up on two cyles a day. No air in rads just water when bleeding. The Baxi engineer said the boiler was slow filling now this indicates that BG have not carried out the power clean properly as it took their engineer 1.5 days to remove the existing boiler and fit the new one and the quote included a power clean which I understand take up to 3 days to be effective with 3 flush throughs/drains until water runs clear.

Just checked the header tank and it stinks like a stagnant pond, water is black and floating on surface ? now out waiting for it to dry before analyzing what it might be maybe formed by chemical and muck reaction. The header tank sitting on its own in a deliberatly clear area with nothing over or at side of it to fall in. My theory, but need amunition before contacting British Gas, is the power clean was not done and neither was a power flush as there was no machinery noise to indicate and it would be doubtful the job could be completed in 1.5 days and include either a power clean or power flush.
Thanks for your time reading and in anticipations of '' Amunition''

Power flushing a domestic house should not take more than one day. After a power flush the water in the system should look very clean, not always 100% tap water clean but near completely clear. Note that if a power flush was done a while ago, the water can start to get slightly murky quicker than you think on really old systems.

Facts about power flushing:
- Have to connect power flush machine into the system. All other cleaning techniques are not called "power flushing".
- The chemical for loosening the sludge can be added on the day, days or even weeks before the work.
- In domestic terms the actual power flushing work will take hours and not days. Very rough est. 7 radiators will take around 5 hours. That can be off by several hours; if the system is really bad or completely clean.
- Will "probably" but does not have to; be done when the new boiler is already installed and connected, but boiler can be isolated by closing taps until the rest of the system is clean.
- The F&E tank should be clear, again not 100% tap water clear, but very near.
- System normally has inhibitor added after power flush is completed, to stop the sludge from building up again in future.