S2D2

Yes they're doing a lot of good for renewables. For info, I'm just about to switch away from Flux, probably to Cosy as there won't be much meaningful export over the next 5 months and the extra cheap period will mean exclusively off peak usage with the heat pump. The ideal would be intelligent and a larger battery but I haven't done the sums yet.

This is interesting and could be the reason for my high quote as the EPC is very out of date. Waiting to see if I can get the quote adjusted after the survey.

No problem, I should add that Octopus doubled their export rate after I did those calcs so it turned all the sums on their head and pointed towards an MCS install. They then increased them by another 50% with Flux after the system was installed and it's performing very well as a result. Ended up installing 5.2kWp panels and a 2.8kWh battery which may need increasing now I've started down the heat pump route.

This might be worth a look for sizing battery: I'll do an update against actuals at some point, went MCS in the end and filled the roof on the scaffolded elevation as that seemed the most cost effective approach. Battery sizing has a much harsher drop off though so be wary of chasing that last 10% of usage as things start getting silly. With export payments where they are and heat pumps getting more affordable, I'm glad I didn't bother with a hot water divert as I would have turned it off by now and used cheap rate electric. This can change at the whim of the market though.

I don't understand what assumptions they base their quote on, I was quoted for a similar arrangement at 5.5k, so £13k before grant. Bit of a postcode lottery it seems. I'm currently deciding if I can be bothered to get them to do they survey and argue for the quote to be reduced based on that, I think they are assuming I have microbore pipe and such which I don't.

Citric acid powder + water, cheap as chips. Not sure how careful you'd have to be with the shower head finish but works a treat in a kettle.

It's still within say 15% of symmetric after losses so still better than other offerings, just primarily a summer tariff. I'll probably need cosy over the winter as the battery isn't big enough for no solar and the heat pump going. So that would mean outgoing fixed yeah for the tiny bit of winter export. They changed intelligent to allow you to be on outgoing fixed at the same time but I'd need an Ohme charger and probably a bigger battery so not really worth the hassle.

Prices changing from October, though it's not a Winter tariff anyway: Import down ~9% Export down ~12-15% Rates can no longer even pretend to be symmetric, so it seems it may be less of a no brainer next year. Intelligent looking good now that it pays 15p export but strict conditions for joining.

It does seem to be a bit too good to be true on their stated outputs: Kudox alulite 1800x280mm=702W(d50) Eskimo column 1800x233mm=1522W(d50?) Heat geek got caught out by this with his home rads, the stated output randomly used d65 on the website without specifying rather than d50, so all of his calcs were off. I suspect something similar is going on.

Have you got a link to the correction calculation? The tool is rather crude hence giving me the "next size up". Interested in the height note as you will get a stack effect I guess.

Indeed Manufacturer of heat pump specifies them for defrost cycles. Solved with buffer/Volumiser on the return Are you sure? If I use the site calculator it suggests I need 600*720@£677, comparable steel kudox premium T22 600x1200 @£80. Not comparing apples with apples from an aesthetics perspective, but that's a big jump. If you're set on the "designer" price tag then maybe not such a jump.

Some random thoughts: Would galvanic corrosion be an issue or is the PTFE sufficient? They claim water content is 1/4 that of a comparable steel rad, which will make minimum system volumes harder to meet. A 720x660 rad is £429+£40 postage?!

If a height was specified such that the fence would be hidden, fair argument. But if not, I don't think the planners are being unreasonable by considering something which is our could become (without breaching a planning condition) visible. If you still don't agree, then appeal, as is your right. Only you can decide if it's worth the time and effort.

What height is specified and how did you satisfy the condition if your hedge won't reach that height for a few years?

As others have said planning don't consider the hedge which can be removed on a whim. Make it PD, which you've said you would prefer the look of, and spend your energy elsewhere.

Ideally get the humidity below 60% to see if you still have an issue, 70% is too high.

I'm toying with this Vs Cosy for the heat pump/battery over winter. The API is simple and can be integrated with whichever control system you need via your chosen HA setup. Plan would be to charge battery/run heatpump in the n cheapest half hour slots. You need to predict your heat demand as that determines the number of slots you need to run for. Then it's just a case of does that average price make it worthwhile. I haven't modelled it yet to get that answer.

Thanks for the tip, couldn't find one of these at the time of install but swapped out the P trap of a SK1A with this and it's much quieter now.

https://octopus.energy/press/octopus-energy-unveils-next-stage-in-smart-heat-revolution-at-energy-tech-summit/ Not really any more information though.

An extra 208x2x23=9.568kW surely? ACH assumptions make a huge difference to heat loss calculations, particularly in well insulated large houses. @SteamyTea's worked example shows that clearly, 84W for fabric and 208W for 1ACH. As mentioned above, it's the realistic value you want to use not the @50Pa result.

The air changes per hour will make a huge difference and you should be nowhere near 3 in a new build. Try 1 as a conservative starting point.

Until you have visitors, who will inexplicably park on lawns/middle of roads/millimetres from the edge of your retaining wall...

B is the measurement I use for this. Ensure its the same for the socket.

I went with underneath the end panel, looks way better than the alternative.

Is this just a one off to confirm they have the right export meter configured? I can't remember if I did this initially, but all export on flux is handled by smart meter readings now, no manual reads. I have an "upgraded" SMETS1 meter.