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Thanks. I guess I was thinking you were referring to circular/bulb style ones. bulb style with controllable CCT seems pretty difficult to find outside the wireless 'smart' bulbs which I don't think is a good solution.

Funny you mention that. A fellow director of the RTM for my building was saying the same thing today about Thames. In other buildings he manages sounds like the pressure has dropped significantly in the recent past. Mrs. Alien 😆 I suppose my priors are that unvented systems usually have much higher pressure/flow than pumped vented systems. Maybe that doesn't apply in your case. Fair enough.

Got an example of these DALI fittings and what they cost?

What were your reasons for not converting to unvented in the end? (I know that would only be for the DHW side given what you've said about the CH pipework).

I've not currently got a build. Just researching things. They all seem to use the same Chinese motors these days. Can maybe save a lot if you order the motors from Aliexpress and fit them to normal blinds (just need to make sure the blinds you get have the right type of tube. (Obviously check import costs, etc). As someone who really wants to hardwire everything the current market is annoying. Either really high end/cost hard wire, or the battery/wireless ones. The wired but not super high end ones tend to lack other features. I believe that a number of the battery ones can be wired in to charge permenantly. So basically you can wire in USB chargers to them. Doesn't help with control though.

I agree you can do it with a single acting button but it's less flexible. Also, things like blinds could really do with 'up' and 'down'.

As I said earlier I think there is some argument about this within the electrical profession. I'm not an electrician, just vaguely aware. I think the argument is that people are expected to go into a meter box to read a meter, switch switches (for isolation, resetting trips). They are not expected to go inside a consumer unit, but are expected to lift the protective flap to switch breakers (and that element of a consumer unit is double insulated).

In the circled area you can see that this is a T+E cable with the outer shealth stripped. This means the remainder of the cable is single insulated. The other tell is the thickness of the cables.

Not to me. The images show double insulated tails not single insulated cables.

He is definitely at the high/craftsman end of the market and I bet charges for it as well.

Saw something on efixx the other day along this lines. It's an argument that has been used by some installers but IIRC there is push back possibly with a recent clarification to say no.

Sure and agree. I tend to think that we should not have rules in place we don't expect many to follow hence why I don't think registration should be required. However, I think we've already covered how as long as these things meet regs then registration is just bureaucracy not a safety matter. Preventing non-compliant devices should be dealt with by focusing on ensuring the retaillers don't sell them.

Yep. Agree. Though you are assuming these plants would provide 100% of energy during the cold periods. Far from it. It would be there to augment existing supply not sure by how much but it will be a big difference. It would also be spread over many plants and the production side is relatively easier than LNG (as it's slow, not needing to compress at the speed that LNG plants do). But storage is a huge issue. For that reason I wonder if we do end up going down this sort of route we end up converting hydrogen to methane before liquifying it. Horrendously inefficient but also if done as a way to use summer excess (on massively overbuilt solar so that the deficit during winter is smaller) then might still make sense especially if it means existing natural gas users can switch to this supply too without retooling. To be clear its not a valid option for wide scale use but for some niche usecases where electric heating is not an option it might make sense. We imported 25% of our gas via LNG in 2024, this contingency capacity would less than 25% of our existing gas usage.

This and long term this is where hydrogen can be useful. Use excess solar during the summer to make hydrogen, store it for peaker use in winter. All done in one site, no need to pipe it anywhere. Other note is that batteries can fill all the short term responsive capacity that peaker/stored hyrdo used to do. The only thing batteries can't really do is longer duration peaker load. ie, those 1-2week super cold winter periods.

Possible, there is so much private capital / startups persuing fusion right now, feels like we are on the edge of major progress. (A lot of the hard bits have been done already, still plenty left though) But I think this bet is more that green hydrogen boilers, etc, are unlikely to happen at any scale at all. Other technologies are a better option.