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What picture? Can't see one.

Well spotted, this unit needs a neutral for the test button to work. But that still does not make it dangerous.

With plumbing, I am a DIYer, well OK was trained on submersible pumps, but we are all DIYers to an extent, but we need to consider how well others can understand what we are trying to tell them, and also follow the instructions, my aim at least it to help, giving instructions which are likely...

OpenTherm is 0-40 volt.

ELV is AC 0–50 volts, DC 0–75 volts, how is 0–40 volts not ELV?

OK, see your point, in the same way as this has nothing to do with the installation, although it may point to a lack of sockets, but if mounted upside down, clearly there can be a danger as a result. And there is little the user can do to remove the danger, the socket in picture using an...

Yes, the video makes sense, but where is the danger? If you fail to connect any live wire, the worse case scenario is it trips, where is the danger? OK, two phases to a three-phase motor can cause over heating, and lack of neutral can mean lack of any 230 volt supply needed for control etc. But...

Thank you, I expected to be shot for suggesting that. Not sure with that, if we get any inductive or capacitive linking on 230 volt (low voltage) cables, it is unlikely to cause any harm, but with extra low voltage 0–48 volts, any leakage or even static could wreck the boiler and thermostat, so...

What error, not seen any error in the video, if neutral is not connected it will trip, that's not deadly, what are they trying to say?

As said, I have never had an OpenTherm enabled boiler, in fact my boiler is a simple on/off oil boiler, it does not even modulate. The whole idea is hinged around gaining the latent heat from the flue gases, to do this, the return water needs to be cool enough, so to keep it cool enough the...

These are the connections I would have expected to have been used, but I have never worked on that type of boiler.

In mother's old house, the FCU supplied the socket for the fridge/freezer, and was where the fridge/freezer would not stop access to, and was put there so it could be switched off to defrost it without needing to pull the unit out. The use of a FCU is also so less likely someone will unplug it...

This is related I think to tumble drier fires, and how grease can react when heated just a small amount, it is more akin to a chemical fire than to an electrical fire, and as said down to cleaning. There are videos about the danger of tumble drying unwashed clothes, one should only tumble dry...

Yes you're right, it was when on the building of Sizewell 'B' so some time ago. Today I use the 3.8 and 5 amp chargers from Lidi, and if I want the car in a hurry a battery pack, that has a 12 Ah lead acid inside it. The problem today is batteries are sealed, so the old type battery chargers...

Looking at other posts on this battery charger, it would seem around 35 years old, back then we tended to use metal rectifiers which had a much higher resistance than the modern type, also the transformer was low quality, and it relied on this poor quality so the current with a discharged...

I would assume there is a reason why EV granny chargers don't run at 3 kW. Seems only considered as safe for a long time with 10 amps, and even then the socket should be marked for EV charging. Even in the early days of the 13 amp socket, immersion heaters still used the old 15 amp round pin.

I seem to remember 2N3015 power transistor and 7812 voltage regulator, and a red LED and a 36 watt 12 volt bulb, the idea was once the voltage when over 13.2 volt it would start to turn on the bulb, and hold the voltage down not very power efficient, but easy to add to a standard battery charger...

I looked up the Honeywell round, seems two models, one uses a mercury switch, not sure on year these were outlawed, but they must be very old. They seem to be aimed at the USA market. The electronic version also seems to be designed for the USA. Intrgas Gateway also seems to be designed for the...

Spot on, the only problem with the new chargers, is they will not charge a battery which has been completely discharged. So I still have one, to revive forgotten about batteries.

At 5:00 pm Thursday raining, few hours latter, and in the morning and melting, looks nice but it has resulted in no milk delivery, but to be fair I told him not to bother in this weather, and yet another non collection of the recycling, but nothing which has affected my life, and only should...