SteamyTea

Does that not just hurt the ordinary person though. Look what happened when a relatively few people withdrew savings from Northern Rock. And when Shell were boycotted in German because of misinformation. Not sure if I should mention Jaffa Oranges in the 1970s. Better to tax the bollocks off them, oh hang on.

Yes, they start at 2m (or whatever) and count down.

Good point, but I doubt it. It is not new generation as such, just recycling excess. Do they say how much power, and energy, they can draw on? Quite a worry that, but they may be using certificates behind the scene.

That is a good point I had not considered. If the main pipework is in the loft, which may be 40°C or more, then, even with insulated ductwork, it can easily heat up.

What temperature is the air in the room? You could switch the fans off and see what happens.

That is about 2.9 MWh of primary energy.

Yes. I think the sizes are based on the rough sawn size, not the finished size. https://www.ryedaletimber.co.uk/blog/regularised-timber-sizes-uk-guide-to-nominal-vs-finished-dimensions/

1 kg of seasoned hardwood has approximately 4.5 kWh of energy in it, when burnt in ideal conditions. As wood burners are not very efficient devises, you probably need to halves that. So a 5 kW one will, if run properly, will take 2 kg an hour, but probably closer to 3 kg. Burners can be adjusted to moderate thermal output, but that not only hurts efficiency, it also changes the combustion chemistry. Depending on the temperature of combustion, you also get varying amounts of particulates. Then there is the land area needed to grown the timber. A metre² of land in the UK gets around 950 kWh of solar energy on it, trees convert, at best, 0.25% of that to timber. So sub 0.2 kWh/year.m². So to run a 5 kW burner for 1 hour is going to take, at very best, 15 m² of land. Then you got the timber transport, storage, conditioning and waste disposal. Do you really want a wood burner. Most houses got central heating in the 1950s and 60s.

Does it match the left handed Stanley knife?

Here is a pdf of a useful book. Heat_Pumps_for_the_Home_-_John_Cantor.pdf

That diagram shows very little in reality. Have you had a heat loss calculation done? This is what sets the size of the heat pump (or any other thermal source) before DHW considerations, the length and spacing of the UFH pipework, the number, type and size of any radiators. There are also other factors to take into account such as ACH, MVHR volumes and efficiencies, window sizes and orientations, PV. The main things to understand is the difference between power [kW] and energy [kWh], temperature differences [ΔT], mass flow rates [], heat and specific heat capacities [C and c], temperature [K or °C] is not power or energy and that generally, in a modern house or any sort, the space heating loads are quite small, often in the region of 2 to 3 kW at a Δ20K. Some rudimentary understanding of weather is also helpful i.e. we very rarely get extremely low, or high, temperatures for very long periods of time. If you want that, move to Canada. The main thing to watch out for is grossly oversized system, which your diagram seems to show. Generally buffer tanks/ volumisers/low loss headers are not needed on a well designed system, but they do all have their place in some designs. It may seem like a mine field, but once numbers are put into the design, it all starts to make sense. Without the numbers, you get badly designed systems that are inefficient.

Can you specify that they must not use one. As pointed out above, it is not just the wiring load, there is also the problems with the kit cluttering up the place and possibly falling. It is not unusual to make minor changes to contracts.

It's easy, just pamper to the electorates fears. Tell them it's someone else's fault, promise them something and hope you don't get caught for past crimes. Oh, and a 3 word slogan. "Lie, lie, lie'

On the face of it they seem quite sensible.

A relatively easy way to check that is look at windspeed and direction when it is raining. Them compare to water getting in. Find your local WeatherUnderground station and see some actual numbers.