Onoff

Hell yes! Try operating a hydraulic pump at 2500psi when the pump is part full of air. Sounds like a horde of angry dwarves with hammers trying to escape!

Along with plastic pipes. What's to rust in there? I'm lost. Won't any "iron in the water" be picked up anyway by a Magnaclean etc? With the appropriate inhibitors in there it'll last an age. If it does go t!ts up it's not the end of the world, minutes to change on a bad day. It doesn't run that often either does it. I reckon the biggest win here is the saving you've made of £428 (list ?).

I couldn't see where it says that at the link? Is that the tech guys personal opinion or can he back it up with a link to his company's, manufacturer's instructions? (I've got the hump this afternoon after a big company's so called tech guy gave me a bum steer! ?). A funny aside, a mate asked me if I'd ever seen a particular busbar system connector. I said yes it's so and so make. No he said I've tried them and they said it's not theirs. So I rang the tech line myself. A very nice young lady confirmed that's no it's not theirs. On the off chance I asked if a particular tech guy, Steve still worked there. We last dealt in 1987 and I had happened across his name in my old filofax. He did amazingly and we chatted about old times. No he confirmed, not their busbar. Yes it is I insisted. He put it to their parent company in the Netherlands and they found a box of 20 in what they refer to as their "museum". Old stock not on the system. My mate bought the lot. I got an email from Steve saying he didn't even remember them so how f***ing old must I be!

Is it plastic insides maybe? Edit: As in steel coated maybe?

Presumably to save you £428 ? Wish I had a hot return. Takes a full minute to get warm then at 1m15s it's hot. If you don't want that pump I'll have it . How's it triggered, occupancy sensor or something?

Says here it a "plastic body...for bronze model". Comes across that it's a valid substitite, as in plastic won't rust etc? Goes on "Can be used for open circuit / potable". https://www.ebay.co.uk/itm/WILO-25-6-1-Plastic-Body-Secondary-Hot-Water-Circulating-Pump-for-Bronze-Model-/292505594621

That'll be magic hole filler or new joists then! ?

Who specified the drilling of the joists for all those pipes and wires? They're supposed to be within 0.25 - 0.4 of the span. https://www.voltimum.co.uk/articles/cutting-holes-and-notches-solid-timber

Are the edges butt tight to the "walls" or whatever is at the edges, could it be rubbing there?

Dead (no power) testing should identify your fault, honestly. Stand by for a pm.

Not if all disconnected! Shouldn't get continuity between N & E. Have you disconnected both ends of the ring? As in you have 6 wires (x2 live, x2 neutral and x2 earth) loose and staring at you?

Any use? You can buy a no name insulation resistance meter, "IR tester" for sub £30 on Amazon etc.

Glad the bits helped. How many finger prints can you set it up for?

Vaseline may rot the "rubber"?

I've heard to smear the brackets with silicone grease.

My Geberit wall drain said 1 - 2%. With my wet room corner that equated to I think 14 - 28mm. I ended up at about 20mm so circa 1.5% and it drains a treat. I was worried that you would feel the slope when you walked across it. You don't. With hindsight I'd have gone 2%.

If you're replacing more than 25% of the roof covering haven't you got to "upgrade" the roof in terms of insulation anyway and thus the felt very likely?

Can you let us know roughly where this flat is in case anyone on here's looking to buy it? ?

Nobody is suggesting it won't heat up. Just that it would likely heat up quicker and retain more heat, as well as using less fuel if there was more insulation in the floor. Underfoot I'm sure it feels lovely. Similarly your "boiler" might last longer if it's working less.

Son to be Makita powered, cheap 18V multitool: https://cpc.farnell.com/duratool/d03220/18v-multi-function-tool-bare-unit/dp/TL19690

Super Dry! Rarely ?

BS1557 was withdrawn in 1954! ?

Seemingly the stuff above is polythene inslated cable with a pvc sheath to BS1557. So 3-cores, red, white & blue, no earth, Imperial 3/0.29 I think, 3 tinned strands per core equates to about 2.98mm2. It's like new.

Get digging!

I think that traditional, bitumen based, string reinforced roofing felt under tiles, has a lifespan of approx 30 years?I can't imagine in 2006 they used that though? (I know mine done in 1987 is becoming very brittle). Maybe the company doing the loft extension is dubious of the original work. At least if they renew the lot and it leaks then there's only one company to blame!