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I will need to take a look at the connectivity/routeing of the open vent and get back to you. Not sure about static head. I would guess from the configuration that this would be around 1.5m or a little less, but I would need to check (pump sits just above loft joists and F/E tank is around...

John D, I trust you are not likening your latest ex-wife to a noisy, troublesome old boiler? :lol:

Many thanks. I will check how the pump sits (it definitely is in horizontal plane) and whether it is higher at the vent plug end. I have not bled the pump itself as I thought the bleed ports directly next to it would have taken care of any air, but I will give it a bleed!

Spacethegas - re the noise. It occurs when the CH is on or the HW is on or both are on. Also seems worse when the boiler starts from cold.

Spacethegas, many thanks. I will visit the local plumbing shop and see if they have any suitable aav's No trv's on the rads, just standard Myson valves Not sure what cf and ov's are? Noise is not constant, seems to build to a crescendo every few minutes. Where do you think the...

I drew this from memory (at office at mo), so some config of some of the pipes where they go in and out of tanks, cisterns etc. may be iffy, but the principle of the layout is correct. Vent from cylinder does go over cold water tank (although shown over expansion in error) Not sure, but...

Herewith sketch of my CH/HW system (apologies for the rough sketching)

JohnD - When I bleed all radiators, water squirts out vigorously. Also when I bleed the 2 bleed points (1 either side of the 3 position valve) just water comes out, no air. The 2 bleed points are the highest points on the pumped system. Spacethegas - It is an open vented system. BTW I live...

BTW I am running a Stelrad Mexico boiler - seems to be a good little unit.

OK, could it be a problem with the pump or the boiler? As I say all seems to work OK (although when I replaced the 3 position valve, one of the rad circuits took ages to start functioning (6 hours) although the other circuit feeding the lounge and 1st bedroom started immediately). I have bled...

Net Positive Suction Head Required and Net Positive Suction Head Available. NPSHR is the suction pressure necesary to ensure correct pump operation. I have bled the air out of the system (bleed points on both sides of the 3 position valve) over a period of 1-2 days and there is no more air...

Spacethegas - what section of my post is unclear?

Any ideas? The circ pump on my central heating system (Grundfos) is positioned around 1.6m above the hot water outlet of the boiler. When the pump is running it sounds as if the pump gets so far then a column of water falls back into the boiler and then the pump lets out an almighty snore. To me...

Mick, many thanks. Yes you are right, tank fed. Sorry for the pigeon English. I suppose it has not done badly given it is believed to be around 30 years old now (all fed by a Mexico Stelrad). I just need to haul my butt into the loft and scribble down the valve part no......

I have a problem that has just sprung to light. I have a traditional wet central heating system with a pumped rad circuit and a gravity hot water circuit. I am running a Honeywell ST699B controller and a thermostat in the lounge. The radiators have started operating even if the heating...