Am having an issue when the boiler is set to HW. There is a bubbling noise heard from the boiler. Does not seem to do it when boiler is on CH. Had British Gas in as I have homecare. They advised that there was a lot of air in the system and this was due to the sludge in the pipework.
I agree that there is a lot of air in the system as I have to bleed the radiators every 3 weeks and yes the water in the system is very dirty.
They advised a Powerflush (Quote £592). Is this the only option or could it be something else. Would be loathed to have the flush done and it not be the problem. Any advice gratefully received.
LoL BG love to sell a powerflush as a cure all - even when they don't really know what the problem is they are trying to solve!! Ask yourself this if the CH system is full of sludge why doesn't it do it when CH is working?
Although you probably have some sludge its more likely that your boiler is scaled up and is kettling. Power flush on its own won't remove that.
Get an independent RGI in to look at your boiler who isn't on some fancy commission scheme. He'll tell you exactly what you problem is and how to solve it in the most economical fashion.
I agree with all the above posts, but would add the point, if the system is filled with sludge, the pressure in the system will rise, and if it is poorly designed, the result will be an increased possibility of over pumping or air being drawn in.
If air is being drawn in at all, this points to a design error and should be dealt with to prevent long term damage to the system.
The usual problem is the feed and expansion pipes to and from the header tank are placed too far apart. For a good design, they should join the circuit within inches of each other.
Power flushing is where a high velocity pump is fitted in the circuit to pump water and cleaning chemicals around. The speed of flow causes the sediment to become suspended, which is then flushed from the system.
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