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MY vented CH system comprises a Potterton Prima 50 boiler, CP53 pump and all rad's fitted with a TRV except for a bathroom radiator which is fitted with 2 lockshield valves ( I believe this to be a by pass arrangement ). All the TRV'S are on the left hand side of all the rad's except for one...

Cowley - I really appreciate your professional help - along with all the other advice I am getting from professionals. Please bear with me - I am a simple DIYer wishing to get it right. I am going to take your advice and clean the heating circuit as you advised but I think I will still have the...

Doctor Drivel - Have I interpreted your advice correctly. Would the cold feed now be 15mm? If so , this is exactly the same as my next door neighbour who has the same boiler and arragements as me other than feed

Tony - thanks for prompt response. It is just as easy for me to make the connection in the loft. So final 2 questions - loft or airing cupboard and if the sizzling noise remains would you recommend chemical cleaning. Once again the advice given by you and your other professional colleagues is...

Tony - I am indebted to all the advice I have recieved. I will convert to your suggested configuration immediately. On another post you recommend connecting the feed 100mm below the expansion tank so I can do this but it will mean making the connection in the loft. You originally suggested I...

I have received a lot of good ideas/advice and would like to summarise my options. I still think I have 2 problems - firstly a 10 year problem from when the system was fitted ie had to regularly bleed the radiators. This was a new house and so the house builder put some inhibitor in the system...

You have hit on the same problem as me. You may wish to read my post " Converting close coupled to combined feed feed & vent " plus a number of other posts I have made. I am an average DIY er so use as reference only but there is some good advice from experienced people on all posts - you...

fortunately I used a number of compression joints so I can easily split the vent pipe above the t and try the "pipe" test. if no problems I could try combined vent/feed method as you suggest. Will also change tank level thanks for your input and that of all other forum members

The vent pipe is definetely clear as I managed to rig up mains water to the vent pipe and at very low pressure water was entering the expansion tank. Also I have done the jam jar test at start up and watched water sucked up the pipe for a second before returning to normal level. The vent pipe...

Is he suggesting linking the vent pipe into the feed pipe

. Yes When I fitted the new 22mm feed pipe I cleaned out the black lining in the pipes that were put back. All the pipe down the left hand side is new I wrapped the olives in PTFE tape but not the treads. Air has always been a problem with this 10 year old system hence why I was...

Tony thanks for confirming but should n't the feed be 22mm

I know all responses are with best intentions but I have 2 conflicting bits of advice on changing my closely coupled vent/feed arrangement One solution is to convert to combined vent/feed and dispense with vent. The other solution it lower the t into the pump. Can anybody mediate ?

So I presume cut above the t - any recommendation on how close to t. Finally I like the inclusion of air bleed. Would you suggest manual and any recommendations Many thx

Thx for the advice on correcting cold feed.How would I remove the vent? After some other suggestions do you feel that this could help solve my problem

Many thx

OK - will carry out when it gets warmer. should I also move pipework at the sametime ? We have a separate gas fired water boiler - the other pipes you can see in the photograph

OK so you recommend I clean again. I do not have a hot water circuit so how would I close down heating circuit - no noticable valves to close

It was a cold day - good advice will change in the summer before I repair the ceiling. Any more thoughts on what my problem could be? Incidentaly I have noticed tonight that where the cold feed pipe got really hot before up to 18" above t now gets warm