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Sorry I'm not helping but I have a similar problem that I've tried to eliminate but after 3weeks it's come back, not as bad quieter than before. It only does it when the boiler fires up and is what I'm calling max flame once the set temp is reached or somewhere near the flame backs off and the...

I don't think I had a sludge problem, I had no issues with cold spots in rads and system flush wasn't really dirty but as I was doing the work I put it in for the required period. I have micro bore on my heating side so powerflush not recommended. System has always had inhibitor added, boiler...

I was getting a noise when the boiler was on full flame, initial start up until temp setting was 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...

Just thought I'd update and say thanks to all who helped. Drained system after circulating x400 for 2 weeks. Filled, circulated and drained another 4 times. Removed 4 seized ball valves and replaced with gate valves. Removed head from grundfos British gas multi head pump for inspection but...

Possibly changing thermal store circulation pump , depending on what I find. Narrowed down to two. Wilo yonos pico 25 1-6 130 £82 or Grundfos ups3 15 50/65 130 £104 Any advice or experience of either would be helpful before I buy. Thanks.

So any of the above will do? They do have other features but I wouldn't need them just constant flow which is one of the settings. There's a bit of difference in price so I'm looking for advice on which are best wilo, grundfos etc. I can't find a replacement head for my existing pump so may have...

Any advice on pumps? As you know mine circulates the thermal store constantly so quiet and efficient is good, some of these have modulation or auto settings but as its only circulating the tank not sure they will be any advantage to me, probably just need constant speed setting, on that pump...

I'm going to be tackling this job on Friday. System will have had sentinel x400 in for 2 weeks by then. Draining down, refilling and flushing x4 before filling and dosing. Still uncertain if thermal store circulation pump is partly to blame for the noise when boiler on max heat, having removed...

Thanks for that. I would be fitting them on my hot water ch system, either side of my thermal store circulation pump and my ch circulation pump.

This is why I asked. I was getting gate valves then read a thread with the information below on those valves so got confused. I still think gate valves are the way forward, as long as they are operated 6 monthly and not wound wide open to a stop they should last and if they leak from the...

Do you have a link I can only find these below? What makes them better?

Won't cause me any problems with restricted flow or increased dp with these valves?

Which valves are best, I've read conflicting reviews, gate valves better, full flow ball valves best. One thing I am wondering is these valves are fitted to allow a pump change without draining system but all posts I've read say they leaked or didn't seat properly when required so drained down...

Me neither I was just going off what I read and seemed easier to stop than the CH pump but it does get more use. I'm not draining and flushing until next week just didn't want to spend a fortune on the inhibitor x4 bottles then find the pumps not upto scratch. Bit of a dilema!

Ahhh damn, I had noticed that but thanks Struggling to find just a head for reasonable price, the ups3 is cheaper but would be a full pump change.

Removed bleed screw from both pumps today. CH pump runs on setting 2 with reasonable amount of pressure I can stop spinning with screwdriver, on setting 3 no chance so this looks ok, I think? HW circulation pump currently on setting 3 (due to cleaner in system and noise when boiler at max) ...

I did think that but thought I'd ask. I'll try and source a grundfos head if I need to otherwise a full pump change. Any advice on identifying failing pump, should it spin free by hand etc. I did read somewhere about removing the bleed screw and inserting a screwdriver, if pump can be stopped...

I've been having a few issues with my heating (covered in another thread ) currently circulating x400 around my system but when I drain and flush next week I'm going to take the opportunity to remove the head from my pump and check if it's ok, turning freely, nothing broken from impellor, play...

Point taken I've edited the post.

I know that it was just for ease of explanation. They where actually marked up as how water pump and central heating pump originally but the stickers came off with the heat.