SteamyTea

Spend a grand and learn to drive, it will save you so much time and money when you come to build/renovate somewhere.

Or have they complied with the rules in both countries. I find bull fighting very obnoxious, and throwing donkeys off church steeples, but that is Spanish culture. I still like to think that British people are tolerant, forgiving and understanding, but it seems we are really an ignorant, arrogant and racist nation. Having been a refugee, I feel a bit more qualified to comment. It is not a nice experience.

No, it is the place to hang the wet suits up in.

So the U-Value will change between 0.07 and 0.04 Now let us just look at the units W.m-2.K-1 A watt is a very small unit, equivalent to 1 kg.m-2.s-3 So in more relatable values, you are talking about a kilo being either 1.07 or 0.04 kg. You are not going to notice the difference. Airtightness is much more important.

I am going to become your Agent when people go looking for a Project Manager. Just goes to show how many of the others on here dick about. Well Done.

Yes, both into the property and out of the taps.

No, or yes. Only a very large ASHP could supply limitless DHW, as it would be running like a combi boiler. My thinking for having two ASHPs is that you can split your DHW into two separate systems, think of it as two separate houses. It is, as usual, a case of just running some numbers and seeing what comes out. So the first thing is to decide how much water you need to heat, that sets the cylinder/s size, then how fast you want to heat them, which sets the ASHP size.

Nah, only 1900 or so posts in 14 months, can't possibly be Jeremy ? Yes, must be an imposter.

Just a matter of sizing correctly, have you thought of having two ASHPs?

Have you read this thread and how hard it is to get simple suggestions done.

About time, someone that lives nearby, drove past his place, or looked out for his Tesla with its distinctive numberplate.

Apparently not active since he vanished from here.

Depending on your viewpoint, just knowing the air temperature will not take the radiative element into account. Once you have removed all other power draws, and taken into account the ∆T. Not that trivial really.

I suspect that you took notice of science lessons at school, rather than think "they are of no use to me".

How well do they cope if they get in contact with seawater? I seem to remember that lithium, sodium and chlorine can quickly become a mess, but then I am not a chemist.

Yes, and the efficiency would be a lot better. Don't know if you can get still get them easily, and then convert them to some flavour of 'bottled' gas. They do have limited electrical power output, usually around a kW. So are of limited use in reality.

All depends on how low you allow the temperature to drop, how high you want the temperature to rise and the power of the heat source. So taking a 300 lt cylinder that has dropped to 32°C, and you want to raise it back up to 60°C (28°C rise). 4.2 [kJ.kg-1.K] x 300 [kg] x (60-32) [K] = 35,280 [kJ] Multiply by 0.0002777 to convert to kWh 35,280 x 0.0002777 = 9.77 [kWh] To calculate time to raise temperature, device by power of heat source. If the heat source is 9 kW, then. 9.77 [kWh] / 9 [kW] = 1.1 [h]

Jeremy's system was, initially, simple. HP for the space heating and a vented cylinder for the DHW. He did have a fairly complicated control system, but he junked that early on. He then got a Sunamp. This was partly because he had high heatlosses from the cylinder that was overheating his spare room. As his Sunamp was an early one, it was fairly easy for him to plumb it in, but, he wanted to take advantage of his HP and integrate it into his PV. This meant plumbing it in with a plate heat exchanger that preheated the DHC before it entered the Sunamp. The plate heat exchanger drew from his buffer tank (I am starting to think that all HP systems need a buffer). If I remember correctly, this worked pretty well, until the Sunamp went wrong. Then his problems started, and now have no idea if they have been resolved. This was, as far as I know, a problem with the newer Sunamps and the lack of 'user interfacing. One problem with any system that stores energy for later use and has multiple inputs i.e. HP, PV and Grid Power, is that there will be many times when you cannot take advantage of two of them, let alone all three. This goes back to my statement that space heating and domestic hot water need to be separate systems, they do different things, ant different temperatures and at different times. The 3D's.

Good enough reason not to fit one then. I am sure that you could get a vented cylinder with a couple of coils in it to do the same thing.

And control ventilation.

Odd isn't it. See a car advertised and they quote the lowest price. I am chatting to someone that has just got his MCS and is willing to travel, but he may think that I just meant Cornwall.

Welcome. I would like to think that £1100m-2 is possible, it does, as @PeterStarck points out, depend on simplicity of design. Also doing the high markup components yourself will save a lot i.e. you can buy a bathroom suite for £250, or £5000. One thing to be careful of is the professional fees i.e. Architects, structural engineers, ecological surveys etc. Some on here have spent more on them that my house costs. It really comes down to planning, and if you have places to store stuff, you can buy in advance.

Nutcraker

It is the word 'gladly' that stopped me giving you the job.

You need to know about this, it is part of English Culture.