Oz07

Fair point another 10 years probably a lot more guys will have experience of them

Alright in theory, try finding one in practice.

That trax pipe is expensive isnt it. I had a place 40 odd metres from the rd. Standard gas connection is only like 32m max or something round here. I built a dwarf wall at the max length point and split the ducting here thinking was gonna need the trax. The gas guys just took it all the way to the house for me without even asking. There was a comment after about how it was over max length, a drink to all the crew seemed to quiet that!

You're obviously a clever guy but if you seriously think a company are going to send out a plumber and sparks for half a day to switch a heat pump thats insane. Even giving them a full day each I'm not sure its likely. Anyone who does them is going to be that busy creaming money off new installs I can't see them swapping one out on day rate. Anyone who isn't experienced with them and banging them in all the time, then would you really want them swapping it out.

You dont float it they just use a dapple bar all over then spray some sealer on it to stop the water on top evaporating. It certainly takes a lot of labour out of the process. Can also flow quite far with a diy shute, no pump needed in a lot of cases.

Generally 57mm is the thickest standard joinery. You can use a 3deg cutter in a 1/2" router for a leading egde

Ha I know that feeling. I bet every self builder gets that. Sometimes even when you pay Somebody to do a job its worse than you could've done yourself.

I mean unless it was new boards you can't really straighten anything out with finish.

Looks great. What delayed the completion from the 2 yr guess?

I realised the same the other week when I put 150 vs 200mm cavity insulation into AI. The payback periods are insane.

I can see why you don't have any 🤣

How do you control the ventilation @SimonD? Any blog posts? Did @ToughButterCup ever bother fitting mvhr? I know there was a post about not wanting it.

Are the slower chargers better for the batteries even if no fans?

If the gradient is existing then its not your problem. Make sure everything you do upto your connection point is ti the regs then all will be fine. Normally bco would inspect on this I've never had water board come out.

Nobody will make you have mvhr for a score less than 3. There's no mechanism for someone to make you. I've had places before with sub 3 scores and no mechanical ventilation.