jack

With my mod hat on, and speaking to all posters, can we please stick to playing the ball and not the human? Inflammatory statements and accusations are unhelpful.

Greenpeace may well be lying, sure. It was still incorrect to say that he was "the" founder of Greenpeace. As for this: The change in his position is obviously starker given his history with Greenpeace, but I think the real controversy is not just that he's changed his mind, but that he's taken a stance with which the majority of climate (and other) scientists disagree. So my opinion remains:

I remember one of the episodes that had a lovely house but for some reason I didn't find very interesting. It was an older couple of ladies (possibly in a relationship with each other) building a small, angular wooden house on Skye. Lovely design and location. Builder was a local guy who did a great job. Everything came in under budget and ahead of time. The only drama they could even try to manufacture was around the air test, because the builder had never had one of his builds tested in this way. It passed with flying colours and that was it. I can see why they try to emphasise any issues that arise (and virtually every build has them).

Not only is he not "the" founder of Greenpeace, despite what he says he isn't even "a" founder of Greenpeace. He's actually an extremely controversial figure, and it's worth do some careful reading about him before relying too much on anything he says.

But I asked nicely!

Guys, can we please tone it down a notch?

I think the other thing is that they run on 24V so you don't need an electrician to install them.

I was talking only about IR heaters relative to, eg, fan heaters. As I said above, other than how thin it is, I can't see any advantage of this NexGen product over, eg, ordinary electric UFH mats.

IR panel manufacturers claim their products are more efficient because of how they heat. Instead of heating an entire room, you heat just the surfaces in the area where you actually need the heat. They aren't saying that their products are more efficient in the sense of more energy out per watt. I'm not saying I agree with this.

The efficiency claims are pure hype. All electrical heating is practically 100% efficient. The main advantage this product has is that it's very thin (0.5 mm).

Yes, but also because we already had a couple of cracks in our polished concrete layer and I didn't want to make those worse or add any more.

From memory, it took several days to warm up our slab from around 14°C to 20-ish when we returned from several weeks' holiday having left all heating off over a cold, dull and windy Christmas. That was only allowing a 27°C maximum flow temp. It might have worked faster with a high temperature flow, but I didn't want to heat things up too quickly.

I called your claim "extraordinary" because it contradicts basic physics (or at least what I understand of it). I didn't say you were a liar, I said that your arguments as to why there might be variations in measured O2 don't hold water, so "clearly something else is going on". Nothing you've said changes my opinion. I'm done with this thread. Apologies to the original poster for contributing to it drifting so far from topic.

Yes, exactly that.

Just because you don't see the point doesn't mean there isn't one. I'm not married, largely because my partner is firmly against the concept of marriage for socio-political reasons. Civil partnerships don't come with all that baggage.

Exactly. But none of the things you mention could possibly contribute to a 10-15% reduction (21% to 18-19%) in the amount of oxygen in the air. No-one's calling you a liar, but clearly something else is going on. You're the one making the extraordinary claims.

More than she likes the planet, it would seem.

@Bitpipe has an insulated basement and I'm sure his experience is that it doesn't overheat. I use our ASHP in reverse mode to cool the (insulated) slab on the ground floor. We have concrete floors so this is very effective. It's a far more natural "coolth" than that provided by aircon. I'm convinced that this helps keep the upstairs rooms slightly cooler too.

I've had a very quick look and can find only a single source that suggests there are significantly lower oxygen levels in cities: https://www.theguardian.com/commentisfree/2008/aug/13/carbonemissions.climatechange Maybe you're right, but everything else I found talks about the dangers of all the other crap in city air, and the hypoxic effects of high absolute humidity and temperature, but these don't affect the proportion of the oxygen in the air, just its effective availability to humans.

The rate for ASHPs went up last April I think.

We really need one of those emojis where the head actually rolls as it laughs.

Sure, but no-ones disputing that changes in air density/temperature cause changes in power output. That's notoriously well known to anyone who's read car mags for any length of time, or been involved with flying planes However, everything I've read says that the proportion of oxygen doesn't change much out of doors anywhere on the planet. I can't find anything to support the idea that as soon as you move from a built-up area to the country the oxygen level consistently increases 2-3% as you suggest. I'm not questioning what you've seen, but there could well be all sorts of other factors involved.

But there isn't going to be a 2-3% difference in oxygen levels between places in the UK. It's more likely to do with machine calibration.

I just leave it overnight and drain it in the morning. No idea what temp it reaches but I'm sure most of the temperature difference is captured this way. Life's too short to think any harder about it than that!

Interesting. That's one of those weird double-think moments where I held two opposing pieces of knowledge at the same time without realising the contradiction!