DanDee

It's all about public funds money making. Democracy comes with many edges, more than a sword.

Yes, in general I wish for both floor and ceiling/walls piping as the perfect solution to manage the cooling loads, and the different heating loads(once you go double the surface of the floor, at the same spacing, you have enough loops that can be off when load needs reducing, without different temps). Whatever the benefits (extra low temp on heating, extra cooling power) this cannot be done for every customer at their expense, only for those that really want something like this.

Whilst a cold system/house will take longer to reheat, so flow temp will slowing raise. The output of the HP is not affected, actually it goes full throttle putting out it's max capacity, and as the return increases, the HP will modulate down. The decision to have or not have a buffer is calculated on the type of emitters, system water volume, interior thermal mass. An UFH screed or slab doesn't need a buffer and can take a wide range of the HP output.

That's not mine, it's a HP that runs all out, only 4 hours a day mainly between 00:30-4:30 for heating, no DHW.

This one runs like a boiler, best SCOP vs everyone on weather compensation. https://emoncms.org/ecodantest2/app/view?name=My+Heatpump

Place it in your attic and duct the air flow in/out(I mean do whatever it takes to achieve that if the attic exists and is free) Place it outside in the least noticeable spot, and build/disguise it, duct air in/out, do you have a spot outside that it's not in the eye of any neighbour?

sounds like there may be a delay with the THW5 sensor which is effectively your hot water sensor, although on the controller it will show 49-51 as you've mentioned, it may actually be sending a signal back to say its at the 10 degree drop point, to test this theory, decrease your temperature drop to -15 and see see if this then delays the heat pump coming on to recycle. if it does .. the THW5 Sensor needs replacing. although for what it is, I would just keep the maximum temp drop to 15 to allow for that delay. hope this helps.

I general the only way to control the output is to limit/reduce the dt and flow rate, the minimum flow rate and the minimum dt in the technical book. By limiting the output it inherently limits the input. Apart from the start-up when whatever the software of the HP will decide that it needs to run at higher frequency after certain period of low frequency runs in order to bring the oil back to the compressor.

both 1P or 3P doesn't really matter, but if you pull 3P the you can buy the 3P one

Mitsu 11 or Pana 12 will both deliver the output needed low temp, over 5Celsius the Mitsubishi will have about 4kW minimum output vs about 6kW Pana(that's because 12 and 16 sizes use the same compressor) ideally the lower the better. The focus should be on having as much radiating surface for best results, underfloor, walls, ceiling, radiators. Mitsu is made in UK, it is liked by people and I bet on it to wide spread in UK to benefit the future servicing/warranty/spares/skills, as well as community. Pana is liked overall in western Europe. Plan carefully on the size needed and focus on the right pairing of radiating surface.

could you imagine the 10kW A2W delivering 10kWx5=50kW?

size matters, which size?

from page 34 https://www.vaillant.cz/downloads/projek-n-podklady/kl-06-e2-verze-01-18012023-2564719.pdf

did you search for "maxa r290"?

I would rather invest in a ultra high definition camera/screen and record a zoomed video of the sun in a bright clear day, and have on display in each room. It's good for vitamin D as well.

Variable water pump https://patents.google.com/patent/WO2023047111A1/en?assignee=Mixergy+Ltd&sort=new

That's what daikin thinks more or less.

You mix the water so you can have the lowest dt and higher COP when slow heating, isn't this known as a general thing with HP's? Only CO2 HP's do well with high dt.

Well that has nothing to do with the new product, so will it mix or not or how much remains to be seen when they hit the market and people talk about it. It has a diffuser, the HP output it's only 1.5kW so low flow rate in general.

This product it's a heat pump cylinder in itself, but instead of having the condenser coil inbuilt around the exterior of the tank, they try something different by having the HP module separated on top, by piping the water through a condenser heat exchanger pulling from the bottom so that the heated water it's fed through the top. The tank it's specifically designed to a degree to avoid mix. What literature have you seen?

Have a look at this, send an enquiring email to them. Instead of trying to heat the whole tank, it's starting from the top down as it's built different than the rest. https://mixergy.co.uk/news-and-insights/introducing-mixergys-new-award-winning-heat-pump-cylinder-the-ihp/ from the comments on youtube When will a spec sheet be out. Particularly interested in running noise levels, capacities and recharge times versus your “traditional” cylinders Mixergy Ltd Please send us an email, and we can provide this information enquiries@mixergy.co.uk To speak to the Mixergy team, please call 01865 884 343. We are available Monday to Friday from 9am to 5.30pm.

with a sCOP of 1.8 you match the gas consumption of a 90% boiler if 2kW gas are burned at the power plant for 1kW electric at HP with a sCOP of 3.6 you halve the overal gas a 90% boiler would burn. With a SCOP of minimum 3.6 you import 50% less gas, £5k grant helps redirects money towards expanding wind, others install PV and use it directly(some are doing it by matching PV with A/A HP's). There's no point in even trying to argument it, just do it, those that can.