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@konastab01
So solar panels are useless but if your dead set on installing them have them installed so they heat your unvented cylinder. The money you get from the grid is almost laughable and they also dont work all the time. Another thing to think about is that its not just a fit and forget some of the stuff last about 10 years and needs replaced ie the invertors and they wont be cheap to replace.
Electric combis cost a fortune to run, I think they are false economy.
Air source, they work but they are expensive to install and if you haven't super insulated your house you'll need to to get the best from them also you need to install usually big radiators so you get a decent room temp.
Overall I get what your trying to do but even with the grants you'll still be spending massive compared to what a gas setup would be also they will be cheaper to run but if your willing to spend the money on the above batter in.