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Mickyg - I do thankyou for your suggestion and I probably will I am just exploring all options

Many thanks Chris R Yes I do I have a fixed bypass ie radiator in bathroom with 2 lockshields. On setting 1 all radiators heat up very quickly. Although my system supports 16 radiators only 3 are double and not particularly large and the rest are singles ranging from tiny to small. So my...

I replaced a Myson CP 63 for a Circulating Pump CP63. Are they like for like? - Circulating Pumps were not able to help me. The reason for the question is looking even further into the continuing saga of air in my system. After asking many questions on this forum I have changed the...

Thankyou for clearing that up. So I could initially try combined vent & feed and if no improvement leave as is and fit air seperator which would be a simpler job

I was warming to this suggestion before reading the attached note in the leaflet The cold feed and vent should not be combined into one pipe before entering the Aerjec as this may slow or stop water entering the system during the initial fill or subsequent de-aeration.[/b]

More responses to DH Reduced noise but on a very low setting No only what you would expect due to expansion

Many thanks again for your assistance. On your previous suggestion you intimated that this would work if air is being drawn down the vent pipe. Other than when the pump kicks in and there is suction for a second there is much more suction on the feed hence my search for possible other solutions.

no difference - in fact I have run the system with only one radiator operating and it runs quieter ie the less time the boiler is on the quieter the system runs I don't but will make some enquiries if it could assist Correct and I feel this is where my problem lies but can't understand...

I am extremely grateful to all who have put forward suggestions which have been many. My problem is down to somehow air being sucked into the system. I have modified piping which has not improved things. I have cleaned system twice. So at a loss on best way forward. There are no evident leaks...

As all radiators get hot very quickly it is something I have not tried

Everything lines up with your recommendations other than second t which points up - as per photograph

I did not explain myself too well on that post.The overflow has a connection to it inside the tank which is about 4" long and points vertically down. I presume it is fitted to stop bugs/insects getting into the tank. The water level is 4" above the cold feed outlet. I hope that makes sense and...

I have looked in the manual and they show a sealed configuration and a combined feed and vent. If I were to change to this configuration would that help ie just extend horizontal section of feed pipe close to the ceiling and t into the vent. With regard to to air in the system if I run the...

What is the Model No of your new pump? CP 63 Can you remember what your old pump was Myson I believe the CP63 was a direct replacement for the Myson Pump

Any more suggestions ??????????

14 rads have TVR's - sorry for incorrect information. I have 1 tiny radiator upstairs and 1 downstairs. So I presume 1 has been set up for bypass. No valves in system as hot water system is separate to central heating - gas fired. Yes I have thought of changing to sealed system but wanted to...

I have a Potterton Prima 60F Central Heating system - simple heating system with 16 rads each with TVR so no room stat. Had problems with air in the system for a number of years. As the system worked OK I just bled a number of radiators weekly to remedy problem. 12 months ago I had to replace...