SteamyTea

Yes, but not easy to do I suspect because of the safety and quality of supply. Most battery charging follows an exponential curve, so as the battery gets 'fuller', the rate of charge diminishes. Trouble with PV is that you cannot guarantee that when you want a lot of power, it will be there, and when you don't want much, it won't be there. This is why they are grid tied, it improves the quality of supply i.e. consistent.

Fairly complicated, but no more so that diverting excess PV to a water heater. You may need to isolate the battery system discharge until it is dark, but that is a simple light sensor. First thing to look at is how much, and when, you actually export. If you are not exporting much, it is not worth it.

Makes a new module less than 2p/W more expensive. Before VAT and delivery that is.

What do you actually mean by 'heat'?

Have a look in the user manual, they often write it down in there.

Bipolyol. Unless they are Welsh, then Dipolyol.

It does depend on the absolute flow temperatures and the outside air temperature, and if the auxillary resistance heater kicked in. Getting 2.5 times the energy input seems OK to me. And it is kWh, not kwh.

It is to do with the way the chemicals react and cross link. I never remember which is which. I think PIR reacts more during formation as the cyanide group reacts with itself, rather than just then polyol group. It is a fair few years since I played with them in Castle Donington, was fun though, had a brilliant chemist there that was excellent at explaining it all.

https://en.m.wikipedia.org/wiki/Coefficient_of_performance

Get Zoot and EpsilonGreedy to ask the questions of them. Then you know there will be no communication.

@Johnmo you have just published, for the world to see, some of the environmental laws you have broken. Good stuff.

Advertise it as a camp site. Set the account up in your neighbours name. Then shop him to the council.

My house used to have them fitted in the bedrooms. I find that 'small click' more disturbing than a fan. It is like the delivery boy knocking on the door during an afternoon nap, an unexpected sound that raises me from a good slumber.

We have a couple of good plumbers @PeterW and @Nickfromwales that are pretty good at diagnosing problems, and an electrician @ProDave that often sorts out control problems.

The Guardian link mentions Celotex and Arconic.

You can calculate it from the flow and return temperatures, but then you have to have a guess at flowrate.

Right. This seems very similar to someone else on here who had a problem. If the flow pipe from the ASHP is getting hot, there is not a problem there. I seem to remember that they had the manifolds plumbed in back to front. Try a search on the site and see if you can find the problem.

Well not from you. Are you asking who you need to ask a question of. You need a question to ask. Otherwise we are all just guessing.

I used to have 2 hour lectures, but there was less than 10 minutes information in them. I feel the same has happened here. A Robert McNamara moment. What is the question you are asking? This is not the same as who you should be asking it of.

Why, apart from nuclear, which price wise is out of control, RE is the cheapest form of new generation. Only the odd quirk that it has some 'green taxes' on it that were there to pay for the phase out coal, and pay for the 'eco' grants/subsidies, that the price between natural gas and electricity is so large. If we put 2p/kWh onto domestic gas heating, and once the larger usage of gas in most homes is taken into account, there would not be a huge difference. The idea that RE generation is expensive is a decade old now. If we lowered our planning criteria, i.e. no new wind on land, then it would be even cheaper. I drove up the A5 (TerryE country ish) today. I saw a sign that said 'No Wind Turbines Here'. It was so old that some trees had grown in front of it.

Because it is so variable, design it the other way around. How many kWh/day (or week, month, year) do you want it to use and what peak power, the kW.m-2 can you live with. Remember that there is a difference between delivered energy and primary energy.

Some are better than others. I had a really quiet one for about 15 years, it eventually went pop last year. They are not too bad, and I do have it within 4 foot of where I sit, fine in the living room, and it can heat up near enough all the house.

I have something very similar from The Range. Cost a tenner I think. They are pretty good for a 400W heater, but you can hear them.

Exactly the point I am making.

I don't think the smaller homes, as a complete package, cost the developer any more. They would just offer less for the land, or ask for more land. They are supplying to a price point, not to a size point. Not really the point I am making though. If we transition from natural gas, to alternative heating systems, we need space to install the kit. It is no good designing a house for a relatively small, wall mounted combi boiler, then it all being a surprise when you find out you need to fit a DHW cylinder and a buffer tank.