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Sorry, I would not personally install UFH as to save money, I only heat rooms when in use, and the heat-up and cool-down times with UFH are too long for it to be a system I would want to use. As far as I can tell, you need to use the heatmiser unit for all the heating, it has relays inside it...

They look like batteries to me! This set of instructions shows how to change them on page 11, 17 and 18. British Gas do of course make non-electronic heads, but a Google for "non-electronic hive TRV head" gets the result Maybe you can point me to non-electronic hive TRV heads? There is a...

That's my battery changed. and not easy to find battery state main page click this which goes to settings, click devices and that shows the first page with all four Wiser units I have, then the third one down showing the TRV, and it shows second picture shown. I went to insights heat report...

nothing connected to com so will not work, likely needs a link wire com to line. Also they look disconnected?

I had added a fault resistance, I had not worked it out, 0.030A x 15Ω = 0.45 volts before the RCD would trip, or 7.7kΩ to trip a RCD at 230 volts. The 15Ω is about what a 15 amp appliance would be. But as said the diagram did not really matter as to the ohms given, as no ohms for the body.

60Ω + 15Ω = 75Ω then 230 volts / 75Ω x 15Ω = 46 volts, so that is maximum volts to earth. Have I made an error?

230 volts bonding and the resistors are just red herrings, This less than 50 volts, well less than 46 volts, the actual value would need the resistance of the body. The right hand 15Ω can really be ignored, it is a near short circuit when compared with bodies resistance. What is more of a...

The difference is permeant line at the lamp, and you can have emergency lamps and ceiling fans with ease, and neutral at the switch means you can fit smart switches which don't require a minium load or batteries. As said, you can have both.

I seem to remember burning a gallon of petrol produced a gallon and a half of water, but this was when I was an apprentice back in the late 60s early 70s, and one would see while the exhaust pipe was still cold the water running out of it. The emergency gas fire with limited to 2 kW, boats...

I have a flue-less heater fitted after the 1978 winter of discontent to heat the house during power cuts, when there was power, it was hot air central heating, so house very dry, so the moisture from the flue-less fire was welcome. But for normal heating, some method to remove combustion...

Sorry I intended to say IT. Yes need bonding with a TT.

So any TT installation is a C2? I do remember my father-in-law getting a contractor to rip up and re-lay the floor in an operating theatre, as the wrong glue used, and the floor's bonding was compromised. Seems it needed a glue which could conduct to stop static build up. Nearly every other...

Oh, he's a good laugh, why not. As to why he publishes his errors, is anyone's guess. Not saying I am perfect, but I would not publish YouTube videos of my errors. I think it was channel 4? Where they had some builder saying how others had made errors, but he also made errors, quoting...

Oh, I had that with a little thermostat, this style the low battery was not on, and the thermostat clicked, but it did not turn central heating on until I changed batteries. It seems Hive is the name of company, not the name of a single thermostat, and there is a whole range of Hive...

These are the heads I am using, the Energenie can only be set using a computer or phone no option to manually set, actually a pair more like £80, since it needs a hub, not worth it for you, the Kasa also needs a hub, but far cheaper, and if anything better, as the app shows how well it has been...

The whole idea of someone making a video with blatant errors in judgement is a problem. If on this forum, I try and explain how lights don't give out light, but suck in the dark, pointing out to support this that tungsten light bulbs go black at the base when full, and they have sucked in as...

I would hope the electrician would refuse. This has been the problem, until we went over the RCBO's it was easy for a borrowed neutral fault to go undetected for years, one good reason to use neon screwdrivers, although clamp on ammeter is better. My old clamp on only showed increments of 10 mA...

My thoughts as well, power showers and instant showers look very similar, but drawing 30+ amps or 3 amps is very different.

I don't know about Hive, I just looked at my Wiser app, and it took me a long time to find where the battery condition is shown Seems I need to change a pair, thanks, do you get same with Hive?

You are brave, and well done, I will only alter central heating in the summer in case a mistake is made. Now you need to look at the TRV heads. I started with Energenie, then eQ-3, then Kasa, and finally Wiser. Only Wiser connects to the boiler through the hub. As to if it needs to, is open...