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Hit the nail on the head there, I think. There's a cultural clash between software developers, who are quite used to a production model where something is released to the market and the customers find bugs that they then fix, and the car (or pretty much anything else) market where consumers expect goods to be completely free of faults. Sadly we have got very used to all software having bugs, as we've had decades where just about every bit of IT kit ever sold has had bugs in from new. We put up with PCs that periodically crash or lock up, that are vulnerable to attack, and that require us to go through the time-consuming process of "updating (which is 99.99% of the time fixing faults that should never have been there in the first place). We would never put up with something like a car that behaved like this, yet now we have a melding of the two technology areas where it seems very likely that we will just have to accept that cars are just like PCs. I think mine is now on it's third or fourth software update in three and a half years, and in reality those software updates were fixing faults and vulnerabilities in the code that controls functions within the car (not once has Toyota ever revealed what any of the software updates have actually changed, though!).

What's generally required is an electrical installation certificate (dead tests only). Having your electrician on site eases the path too. Make sure bonding is in place for a full domestic install. Or that TT earthing has been set up for site supplies.

Provided the cop remains above 1 despite the defrost cycles, why would you use an immersion? With external temperature of around 10C in October, and dhw target temperature of 50C I was seeing COP of between 4.2 and 4.5. This was before the hearing season started.

I went with the full length bench - built just a week before this thread was started!

We bought that item just before we moved in - we felt had a great meaning with us as a family (of pebbles!), the house, and the year we built it.

I come from a disgustingly long lived family too Takes that long to do just a bathroom, ask OnOff

@jack great reply thanks.

Indeed. I’ve taken some comfort in the thought of the Sarah Beeny soft play centre for grownups though.

@johny_99 - to get condensing you only need to keep the return (to boiler) below 56/57°C, the flow can be higher. Any reasonable amount of condensing will get 10-15% more heat from the same amount of gas. Depending on the design of the system you could get a flow temp of 65°C and still be deeply condensing. I would aim for a return around 50°C. A conventional radiator at 60°C will give out about 40% more heat than at 50°C.

I'll post a pic in the next couple of weeks, they are being powder coated to match the window frames at the moment. I'm not sure that they will be on when we move in!