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Hello all, Looking to replace a Danfoss 077B6635 which I seem to be struggling to find...I can see similar ones 077Bnnnn but wonder what the difference might be ? Just wondering if it's more a physical thing in so much as the capillary length rather than the actual thermostat and I could take...

No, don't think it's the same “loop” as I'm pretty certain I have a tee joint the where the upstairs return joints the downstairs “loop” after the last downstairs radiator and before the pump back to the boiler so I'll take a guess that after the boiler there is a split between the two but I'd...

Nope, nothing inline. I'm now wondering if its the TRV's (Pegller Terier II) on two of the downstairs rad's ! I can press the valve down OK and they seem free but when the rads were off no leakage when "Off" and as mentioned I did open them and there was water flow so to some degree that...

Thanks Terry. My Dad's hopefully expected back home from hospital early next week so an element of urgency so I'm contemplating just taking a punt on a new pump to then be able to look at this one - could I possibly ask for any suggestion as to a suitable drop in replacement ? I'm just trying...

Now having access under the floor the pump (Grundfos USP 15-60 130) which looks to have been replaced in 2013 seems to be running OK. It's fitted horizontally with the outlet side slightly higher than the inlet although it is pretty much at the lowest part of the system – pumps always been...

Just going back to the increasing size; Dinning room is 1st, double - Lounge follows which is larger again double (both Stelrad but that's not really relevant) followed by the Hall which is the older "ridged" type (no convection fins) and in volume maybe between the two. It's not a massive run...

Sadly no - that's under the kitchen and tiled ! It's just over an arms length (mine anyway) away...I reckon I'll have to make the access more suitable to my "frame" !

Thanks for the diagram - yes from what I can see that would be how it is and realise that the further you get away from the boiler the cooler the temp might be... ..what might be the best way to try and balance this type of system (if its not the pump ?) MTIA.

Its a Grundfos, it's on the return after the last downstairs radiator (and return from upstairs I reckon) before the boiler but just out of reach from the access for under the floor – I need to get under to reach it and it's a tight squeeze for me now as it is ! I can make it a bit larger though.

Thanks Terry. Yeh, I'm I opened each one when off (I think it was each) - catching the flow in a washing up bowl ! I'm pretty certain there is flow from each.

TRV's: two do, one doesn't - an old style "non convecting" type (that I should replace !). Good wash through - using both inlets/outlets (made a simple adaptor for my hose) and removed both top plugs - upside down, shake it all about so ran clean as best I could I reckon ! Not sealed - just...

Thanks, I've tried balancing using the lock shields on each radiators but with no great effect – the CH system as it is is pretty much as it has been for 30/40 years+ probably – it doesn't seem to be a true “feed and return” system as it were though with each radiator just T'd off the supply...

Back at my parents to try and sort out “Cold/Cool” radiators downstairs...well trodden ground I know, sorry ! Basic Semi; Ideal RS330 boiler – all radiators on one zone, 4 upstairs (2 small) and 3 downstairs so nothing really that should cause issues. Upstairs all hot, downstairs all pretty...

As mentioned post an actual picture of the valve that controls your CH - would help. If moving the lever manually triggers the microswitch and turns the boiler on them it would seem your electrical circuit seems to be OK. Maybe the synchro motor has failed, if you can remove the cover and you...

By way of follow up & just in case anybody in the future might be looking at a similar issue of worn gear teeth on the plastic cam in these that results in it slipping and giving a constant knock throughout the pipework and comes across this thread..... The BOSS Therm BZV22 valve is badged...

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Thanks for the reply Chris. I'm not sure it will though unfortunately - this mentions compatibility with the “Metal Head” BZV22 whereas this dead unit is an older Plastic Head BZV22 - several questions on the product page asking if compatible with the older plastic one with the answer no. It's...

Bit of a long shot...don't suppose anybody has, or knows of any of these “old” Boss Therm (BZV22) 2 Port 22mm valves gathering dust by chance, trying to get hold of one seems a tall order ? Needing to replace one for a relative as the plastic gearing has worn so it doesn't open completely...

Yep, unfortunately they are John. I wish it had come into mind before it was poured ! Thanks.

Hi All, Looking to fit a new hardwood driveway gate to be hung off a new stone pillar - yet to be finished but new walling in progress. Going to add add strength to pillar by putting a steel box section post on a plate and fix to footings and building pillar around and fill cavity. Any...