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Attached are images of my two pumps, pink/red ch circulation pump, blue thermal store circulation pump. Would the black pump ups3 15-50/65 be a replacement for either of my pumps if I find any issues. My issue only appears to be linked to the hw circ pump but asking about both anyway.

Ahhh I see, sorry about the questions but I understand now. Cheers Ian.

Ok yeah when I think about it if the boiler is noisey this will be emphasised by the pump? So sounds more boiler related than pump but I'll check them all the same.

Cheers again, I'll give that a look at. If it was pump related any idea why it goes quiet once upto temp? I have a couple of videos but can't seem to upload them, I've compressed them but still having problems.

Great idea, I've attached an image of my pump so just pull off front and check, after electrically isolating and draining of course.

Sorry to bother you but could I send you a video (somehow) with my boiler noise? Cleaner is in, cleaned filter yesterday small amount of sludge. Noise is obviously still there wasn't expecting it to go over night but when I drain it next I'm wondering if its worth chaging circ pump, if that's...

Tried to upload a video of the boiler noise but keeps saying there is a problem? 45 sec clip mp4?

Quick update. Drained system and all rads today, new filter fitted, refilled system plus 3 litres x400, rads bled, all back on. Will keep it in for 2 weeks, drain, refill and drain another 4 times, then refill plus 3 inhibitors, hopefully does the job otherwise I'm fooked! Thanks for all your...

I've always thought that but someone said they're was a pump, thanks for confirming they're isn't.

Ah ok. When I looked at a parts list and exploded diagram thought it showed a pump? My mistake.

I'm guessing the pump your relating to is the pump in the boiler abs not the 2 at the tank.

Very informative cheers. I'll get another x400 tomorrow and put the 3 in for 2 weeks. The filter I already have is a salus mag defender it's a replacement for the current one as the valve started to drip when I last cleaned it. It was still under warranty so they sent a new one. I've had the...

ianmcd thanks for that, I totally agree with what you're saying, not that I'm any sort of expert my bit of knowledge is just through research and help from people like you. I need to replace the magnetic filter anyway so thought it may be good opportunity to put the cleaner through, I've never...

Vaillant eco tec plus 418, 7 years old in March has been serviced annually.

Thanks for that I had read that somewhere else. I've got 2 to put in, I will then put 2 inhibitor in again when drained and flushed, I have always dosed with 2 inhibitors perviously, good advice.

I was getting a noise when the boiler was on full flame, initial start up until water temp reached or if high demand, shower running heating on. It sounded worse if I slowed the circulation pump down and slightly better when I turned it up, sounded like a rumbling but only when on full flame...

Yeah I understand the f&e is on top was just putting as much detail into post as possible. Reason for asking is I've been advised to flush my system with sentinel x400 and it says on bottle can be used on all indirect systems. Wasn't sure if that meant you couldn't use it on direct systems?

I have a 180l flowmax thermal store on my first floor, water heated by my boiler on the ground floor and returned to storage where it is also used to heat radiators when required and provide mains pressure hot water via an internal coil and blender valve, open vented system. I've read lots of...

Thanks for all your help and advice, much appreciated,I'll give them a ring.

I currently have the hotwater set to come on before the heating so that wouldn't be a problem only issue would be if someone tried to boost the ch and hotwater hadn't been on I'll look for a like for like, do you think the Honeywell rf2 is no good then ?