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I'm wondering whether a biocide is needed in my CH expansion cistern. It's a conventional boiler and Y-plan setup with 6 rads. I have recently replaced and relocated the cistern. The old cistern always had a yucky layer of 'soggy cardboard' of the surface. I would syphon it off, drain and...

1mm is unlikely to make a difference. Bolts can be cut down though. Wind up a couple of nuts on the screw, cut or file to desired length, unwind the nuts to remake the thread. Edit: Btw, the links I posted earlier were for stainless steel, the B&Q ones are not. Just saying.

That's a masonry bit so the shank will be smaller. M3 screw fits a 3mm hole. M4 fits a 4mm hole, etc. Conversely, 3mm bit won't fit inside a M3 thread, etc. It's like rocket science only simpler.

Compare it against a 3mm drill bit. An M3 screw will be about the same diameter (just a tad smaller), and the drill bit will not fit the threaded hole. Personally given the choice I prefer hex socket head, but that's just me. Of course it would need an allen key.

https://www.amazon.co.uk/Stainless-Steel-Button-Socket-Screws/dp/B081ZRGT31/ https://www.ebay.co.uk/itm/181024489629

Torque is what can shear a seized bolt where an impact driver would free it. I would rather hit one end of that good, balanced leverage, with a two pound hammer. :D

Sure, I was just clarifying what he hasn't done is swap the valves. For all that, might as well replace the radiator at the same time. :)

All he has done is swap over the white caps (they either just pull off or undo with a little screw in the top) to put the +/- cap to the unseized valve. Swap them back if you prefer it the way it was. You'd have to be pretty absent minded to do that, "loosen" things up, and then not mention...

It's for a CH cistern relocation. The feed ideally needs to come off at a right-angle, clipped to the shelf, and then drop about 0.5m over a 3m run. It's either this or have a short stub from the tank connector going to a compression fitting elbow.

This has to be a noob question, sorry. Can the 15mm compression nut from a tank connector be removed and instead fit a 1/2" BSP elbow to create a right-angle connector? The threads seem to match albeit a bit loose. There is no olive obviously. So for it to work would at least need PTFE...

Only you can decide. Just do whatever is most convenient. If it's too confusing, replace one or other unit, though you'll still have the dilemma of which to replace. If you can find the user manuals - there's often a button sequence to access an "installation mode" to enable single channel...

Perhaps you meant Schrack MT206230. That appears to be a 230VAC 10A 2-pole C/O relay. What's it doing?.. at a guess either load switching, or control logic. You'd have to trace the wires to figure it out.

Noted. Thanks. ;)

It's a Potterton Netaheat Electronic 6/10. I'm inclined to keep the configuration as it is, but the upper pipework will be replaced so if it can be improved then now is the time to do it.

Hi, Just wondering would there be any advantage to deleting the up and over vent pipe as part of the cistern relocation, and what it would involve? Here's current setup. Conventional boiler with Y-plan. Pump flow is down. It's been this way since install 1985. Existing cistern is 1.7m above...