MikeSharp01

Definitely not me!

What is included in the scope for these two. If it includes full Passive House work up and all the detailed specifications including drawings / schematics for all.the systems it might represent good value. But as @Mr Punter says you can go other ways for most things.

Sounds awful - very sorry to hear this. No contract no payment seems like a plan to start with and report to ARB.

What people? What am I doing down here in -2DegC then, perhaps I am not smart enough or not in the majority, or just stupid Systems of systems have probably the biggest bear traps.

Gap in the market I guess but be aware that books are static things and in our world of technological chaos and complexity they struggle to be relevant at the bleeding edge for any great period of time.

Yes and this points up the classic system of systems challenge. We are all, Google included, building systems of systems with component systems over which there is little or no control. So google changes something and your system is broken and very little you can do about it other than rebuild it using another system. As we have seen reverse engineering is not an easy answer.

Yes but the DNA has got survive and be finable, the whole planet will be so overgrown, loads of plant DNA, needle / haystack doesn't come close to the scale of the problem. Of course you could make trillions of copies and scatter it about everywhere but even then....

Yesterday I fell into conversation with one of my plant science colleagues about the whole global warming / catastrophe thing and her most telling comment was that although see would not be happy to leave them the plants would be OK and would restore the balance without us - I suppose we might think about letting it come to that. I then speculated that then they can evolve back to us, or something similar, in a few billion years. At which point her concern would need to be how to preserve her research so they could find it after such a period. OK so here is a challenge - how to preserve something and so arrange it that it can be found in a couple of billion years - I know bake it into one of my mums rock cakes

This has been said here and seeing the statement out of context here sort of sums up the issue. As @SteamyTea points out it is, has been perhaps, so cheap that we have not focused on it in the bigger picture. There are several dimensions to the wider discourse here. Firstly, the planning system which itself has several dimensions. IIRC we had a discussion several years back about the need to revert to the much greener building standard that the current government (I get the difference between 'terms' but essentially the same government since Cameron) removed prior to 2016 - have I got that right? At any rate this would have meant several million homes, by now, would have been built using a lot less energy and perhaps the message would be plainer to the wider population. "Look at those people over there aren't they lucky to be living in one of these new homes with ultra low energy bills". In addition, planning is also stalling our ability to build on-shore wind farms and solar farms so we are not able to invest in RE at the rate we should. We are a mile from the Cleeve Hill / Project Fortress 880,000 panel solar farm and that has taken 6 years to get through planning and work started last month. (I wish I could buy solar panels at the price they will be paying!) Secondly there is the elephant in the room that nobody really talks about but @Roger440 hints at above. This is a simple, often missed fact, that RE systems still have a carbon footprint across their lifecycle. Even abundant free energy, as might (probably will be abundant but won't be free) be arranged from fusion reactors, is not going to be carbon free in the delivery of the power stations and wind turbines / solar panels have a carbon footprint as well. This implies that there is, as yet, no carbon footprint free form of energy generation so we should strive to use less of it wherever / whenever we can in my view. For instance even if they give the energy away from fusion, which they won't, I still would not wish to live in a swiss cheese house if it meant that there were 2 fusion power stations needed rather than one!

And the answer is YES, because you said they were super 'Human', but in the case of the driving licence only after 6 months of residency IIRC, the case of sit University exams only after paying the fees and taking at least one term / semester of courses and in the case of state benefits only after their asylum claim had been assessed.

More usually, and perhaps less laconically, the ones you start going down but conclude there is no future so turn back, taking experience back with you so no loss, but perhaps unaware of the opportunities that lay just around the bend. So, when later, in more knowledgeable times and with greater experience returning to the point of turning around and looking ahead from there is often fruitful.

For now the human is the inventor and the writer of the AI should perhaps get the credit but also when it does wrong who takes the fall. This is exactly the problem the insurance world is looking at for driver less / self driving cars.

Yes because this gives us the chance to review the untraveled roads that may have just been passed by on the way of doing other things with slightly different foci.

Not like this we haven't and the 'most' in your comment is telling. The lack of understanding of the likely impacts, Chat GPT being perhaps the most marker of this, is staggering. The dystopian futures seen in movies such as you cite may not be the future reality but change is coming and we need to get a grip, somewhat, on its direction and assess the needs of the people in the light of it. For education, and in many dimensions of education, this is like the calculator debate gone universe scale. Questions like; what is the point of current education paradigms when data, information, knowledge and wisdom (with associated links of increasing understanding by the machine) are all available at the press of a button. I am definitely not a doom sayer or against the application of AI but I am against missing the trick and inappropriate application in same way I am generally against eugenics even though we have the capability for it.

Yes - I am immensely enthusiastic about what this technology will do while being profoundly concerned about our inability to get a grip on the scope for misuse, lack of attention to wider social impacts and dim headlights in our education systems about its likely impact and hence future prospects for mere humans.

Hi This image from another post on here gives you a good indication of your system:

I don't think you can reclaim the VAT on plant hire, only equipment and materials that are part of the finished build (as defined by the planning) and labour charged including VAT are allowable I think.

Ouueeer a Sewer!

Pretty un intelligent of the machine, but given everything sounds right - it never gets to set point. There is something else that Graham says in his video - if you set the tank temperature to 48 then the water in the tank can vary between 43 and 50 implying that the hysteresis is 7 degrees so although the set point is 48 the system turns off when it gets to 50 and back on when it gets to 43. So if the flow temp is too ow it never gets there!

I also found this in the manual: "We normally aim to heat the cylinder within an hour, if you want to decrease the reheat time you can do so by pressing the DHW mode button, this will show a picture of a bath and will run both heat pump and immersion heater at the same time." Which should solve your immediate problem. Presumably the legionella cycle is done with the immersion heater as the HP won't achieve that. I did think of a test to see the difference between the heat pump set point and the tank temperature. Get the DHW cycle running and after an hour, assuming it has not reached the 48DegC temperature back of the 48 temp setting by 1 deg at a time until the system recognises the tank is warm enough. This will give you the difference (delta) and you can then adjust your main flow temperature up to overcome it. Curiously there seems only to be one flow temperature setting in your system '2021' there is no equivalent in the heating group 3XXX so maybe the thing just runs at maximum until the temperature is reached. If this is the case then the temperature you get from my experiment above is the max the system can reach in current circumstances.

Do you think your system looks like this?

Looks like you can turn on the immersion heater to get the bath problem sorted. Not sue that 2Deg C is sufficient difference to get the tank to ever reach the 48Deg C figure, has it ever reached 48 with the 50Deg setting? As the actual temperature out of the ASHP will be much lower by the time it reaches the tank coil almost no matter how much insulation you have. So you need a few more degrees on that setting otherwise it won't get to temperature and switch to heating. 18Kw is loads so you should have no problem delivering serious quantities of HW to the tank but the temp must be high enough to overcome the losses in the system.

Cannot see any pictures but the text is useful.

Do you have a systems diagram of your setup that may have been left by the installer, first or second but second preferably?

No you should have two temperature settings for the water flow out of the heat pump, one high - for heating the DHW and one lower for running the radiators. At any given time there should be heat in only one circuit, DHW tank coil or Radiators, never both.