SteamyTea

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.

What does that bring to the party, dancing girls with doughnuts like fannies.

A lot us on on here know, but that is because we research things and are willing to take, and act on, advice, rather than though up our hands and say 'it is not my fault' You will still have a house that is at the same mean temperature, just that some rooms will be colder and others warmer. Now if your ASHP is too small, then it will always struggle to heat the place when it gets cold. You also keep fixating on radiator temperature; temperature is not power or energy.

Here is the steam oven I had in the 1970s. Think it is still kicking about somewhere in my Mother's loft. https://www.argos.co.uk/search/prestige-4-litre-aluminium-pressure-cooker/ I find the advertising a bit iffy, they all claim to preserve the nutrients, flavours and moisture. You can always put a Pyrex boil of water in an oven, does the same thing. Food Poncery, I hate it.

kWh What's the difference between a drummer and a drum machine? You only have to punch the information into the drum machine once.

What, at 50p/kWh, (expletive deleted) off

At least a metre, and not taught I think. Some hp manufacturers specify the length.

Are the flexible pipes long enough?

https://www.bbc.co.uk/sounds/play/b06tr5tf

https://www.pipelagging.com/ Something for everyone there. Hot and cold pipes should be lagged.

We don't describe air-conditioning as a 'reverse' heat pump. There are basically two elements to any heat engine, the hot side and the cold side. All the rest is plumbing.

No, stop saying this, they work exactly the same, it is just where you measure the temperature.

Right and wrong. Temperature is not energy. As a simple explanation, for any given heat emitter area (radiator or floor), you can deliver more power (power is not energy) the greater the temperature differences. So yes, you need a bigger area if the difference between the floor area and the room's air is great, or you need a higher temperature. But then it also comes down to how long the power is delivered for. This is the energy (energy does the work, which is heating the air in the room) and is why we use the unit kWh, it is just power multiplied by time. So nothing wrong with a relatively low temperature, but it may need a larger emitter area and need to be on for longer.

I feel so much better having caught up with all the trials and tribulations. Going to hang my washing out in the sun, do a bit of painting and then go out. My life is good.