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Don't know. The system (pipes and boiler) si old. There is a rattle if the CH circulator is on the lowest speed. MickyG - If I could live with the noise I wouldn't be asking for advice.

Yes, I do, behind a wall. But no motorized valves.

I have no valves at all on my system. C plan is where the valve is on the gravity hw circuit, right? Then that would make no difference to my annoying clunking noise.

Why not?

Ah, so I am assuming isolating the pump stops any movement of water up the flow pipe via gravity? Therefore, if I was to put in a 2 port motorised valve on the flow pipe, to open when the pump starts, that should cure it? I can't get to the check valve as it is behind a wall! Thanks for the...

Thanks for the reply. It's not kettling. It's not coming from the boiler. Had kettling before and treated the system with boiler silencer. It really sounds like a noise from a pipe. Besides why would kettling stop when the pump is isolated?

I have an old Potterton Kingfisher floor standing boiler. My hot water is gravity fed and my heating is pumped. The problem I have is there is a loud "clunk clunk" noise from somewhere (sounds like from a pipe). This noise occurs when the HW only is on, and when it gets to a certain...

Thermostatic valve pins may be stuck, and system may not be balanced correctly. All depends if the problem has just happened or got gradually worse.

Ended up re-packing the valves. Didn't need to drain down. Thanks anyway.

Thanks for your concern Tony. I am a capable guy, have done lots of plumbing on different systems, but have not worked on a megaflo system before. Have worked on combi systems and vented indirect systems plenty of times, so rest assured I will not be pumping the system up till it bursts! Just...

Just changing a couple of radiator valves for a friend. I am familiar with combis and unvented indirect systems, as I have installed lots of rad before. Never had to drain down a system with a megaflow. That's why I wondered if the rad system was pressurised, like a combi system. Thanks.

Thanks Mickyg. Just as I thought. I had also just seen a post on another thread sort of confirming this. Does this mean the CH system will be vented with header tank etc? Thanks again for your quick response.

Hi, Can somebody tell me whether the central heating radiators are under pressure when the system comprises of an unvented cylinder, like a megaflow, or is it separate? Many thanks in advance.