SteamyTea

Start with Excel, your existing bills and PVGIS https://re.jrc.ec.europa.eu/pvg_tools/en/#PVP

And E7 DHW system can be installed very cheaply. Cost more to run, but very reliable.

If it is the same model of inverter, you probably don't have to inform them. If different, then yes, they will only need the relevant certificate that comes with it (I can never remember what it is called). They have this for safety reasons, so best to inform them.

Seem to remember that the whole DC side is not earthed. If that is still the case, there is only one place it had go though, the inverter and then the meter.

No. It is illustrative. There will be a system that fits that curve, that is the beauty of physics. The concepts are simple.

Trust in education.

Check with MCS, they should know the answer. Regarding your initial question. Yes, you are unlucky. Put up a lightening rod.

Welcome. Get a good book about physics. The two main areas are material properties and thermodynamics. Both only require basic arithmetic, so no need for a maths book.

I can't remember now, as it was a decade ago. Do generation meters get a MPAN number, and do meter swaps need to be notified to OFGEM. It was a serious offence to misreport the initial meter readings when first installing a system. Easy enough to do a like for like meter or inverter swap as you can isolate the system easily. Just take lots of pictures of where the wires go.

You can ask the DNO to reduce the local voltage at the transformer, then you can export OK. The generation meter problem us interesting, they are just normal meters on single phase. Not sure if they have to be different on 3 phase. Maybe @ProDave knows the answer to that. if your parents are on a normal part of the grid, then they should be OK. What inverters you have as they need to be configured for the UK grid, some cannot be changed by a user after they are installed, they need an installer code.

Better off all round with an induction hob though. Back to my idea of spending money on your existing burner. Are you in a hard water area? Is there a chance that the heat exchanger is scaled up?

Look at it again. As the ∆T increases, the CoP reduces. It has nothing to say about absolute numbers (in fact it is just made up numbers, I could change the chart to fit what you want though). The important thing is that it is sizing and system design that is important, not the underlying technology. A thermal boiler is just a heat engine, just that very little excess energy comes from the air that is drawn in to aid combustion. Though with a condensing boiler, energy, via phase change, is sometimes recovered.

There was an article somewhere that it can devour roadside pollutants. https://www.rhs.org.uk/science/articles/super-cotoneaster But worth a warning that the original NASA report about plants cleaning air was pretty limited in scope, with ambiguous results. But still quoted 32 years later as gospel by some. https://en.wikipedia.org/wiki/NASA_Clean_Air_Study

At the most basic level, any heatpump will loose efficiency as the temperature difference increases. It is also not linear. The idea is that the system has to be designed to work in the most effective temperature range. This is achieved with a combination of system size and refrigerant gasses used. (the CoP is the extra energy from the air or water, not the total energy)

Correct, can't say I have noticed any.

You could dedicate part of your PV to DHW. That could reduce the need to limit exports. You should be able to work out, for your orientation (that's panels, not long girly showers) and location the best proportions to get you maximum efficiency.

Go for it, then you will wish you kept your old boiler. Do a bit of general research on ASHPs. Like all internet research, generally, the negatives reports outweigh the positives, but that is because people are often idiots and don't do research. Here is a good example of what can happen when no proper advice is sort first (you can skip a few of the early pages).

Have a word with @canalsiderenovation He can tell you who to avoid.

It will get recycled though, do lowers the embodied energy of the next product it gets turned into. It must hurt when you fill it up.

Just a thought. How bad is your old oil burner. Would spending part of that 3k on improving the house, better heating controls, and more than just a service on the boiler be money better spent? An example is my neighbours. They get new cars every 3 years, 'because they need reliability'. We live on a good (for Cornwall) bus route, the two schools are within walking distance, 3 supermarkets less than half a mile away, A DIY shed, MacDs, Dominoes, and Costa close by. Probably costs them 8k a year in depreciation, and he whines that it costs nearly 100 quid a month to run the house.

Blackthorn and gorse. Grows like weeds down on the Cornish North Coast.

Global sustained economic growth has always happened during times of low, and stable, oil prices. It is then down to governments and consumers, to decide what we burn it for. Do we just add it into inefficient vehicles, or build some wind turbines. Heat thermally leaky housing, or make cheaper insulation and windows. Seems to me we just like to burn it, thus keeping old infrastructure going. You are in a position to choose. Choose wisely.

A decade ago, Mike L, over at the other place was whining to me that he fitted s GSHP just as the oil price plummeted. Been low ever since. All that fuss in 2006/7 that oil would hit $250/barrell. Even the greens new it would not happen.

Green and Eco are nonsense terms, they have no numbers attached to them. Oil burners, like gas, are not dreadful on emissions, so look into replacements. ASHP may well be worthwhile, depends how easy your current pipework can be modified for different controls and lower temperatures. RHI is a costly route to go down. Spend an hour on eBay and see what is kicking about. If you want to reduce CO2, look at your car. Makes me giggle when people on here talk about low energy housing and then drive a Landrover, Ranger over, large Merc or Audi. This is just pottering around.

One advantage of gutting a place is that you can deal, relatively easily, with airtightness issues. Just make up your own blower and start sealing all the leaks.