dpmiller

@JohnMo yes the supply to the ASHP is singlephase, but the inverter converts it to a nice controllable voltage-, current-, and frequency- controlled 3phase.

"single phase" there means it doesn't apply to any inverter units as they use a 3-ph compressor and slowly ramp up speed, automatically clearing down gently with no "protector" to trip out anyway...

@Tamdray where did the last photo in your post come from as it's from a different door?

I do wonder how accurate the readings of power analysers are vs certified meters, especially at the low end and with odd power factors...

Is there a maintenance procedure for clearing it of mould, insects etc?

If it's not actually leaking, could you not just add another expansion vessel elsewhere in the system?

something like this https://www.ebay.co.uk/itm/255271428161 as the rubber seal works commendably well. I did however glue a washer onto each flap, to weight it a bit more and ensure it *only* opened with the strong flow from the hood. For motorised, you're probably looking for a spring-return fire damper unit, as the cheap chinese motorised units require an odd switching logic that would be difficult to integrate with our way of wiring things, IMO.

what's the thermostat on the heater set to?

If the duct runs vertical for a bit, there are good sealed gravity flaps available. That's the route I took. Motorised damper is another possibility.

better that than acidic condensate dripping and marking whatever's beneath it.

Isn't quoted boiler efficiency combustion efficiency? Certainly the average combustion analyser gives efficiency numbers based purely on this, it cares not what the water temperature is...

there are other brands of router that have built in NAS, I know Draytek often do. I've now got two old routers reconfigured as access points/ switches hanging off the Huawei 4g one. One is a Talktalk homehub thingy, the other is a Draytek 2850. It's got a USB that will run either as a printer server, an NAS, or take a 3/4g dongle for failover purposes.

Band 1 is 2100MHz I think GPRS is a slow data connection, your local mast isn't 3g is it?

Is the Howdens account in your name or the Builder's?

I wanted to retain our existing panasonic fax/ DECT base and acquired a Cisco SPA232D adaptor. I first configured it for a cheapo geographic number from the provider to test it's functionality and to get a fixed phone at the site, and it has been working well.

I'm just awaiting our number port to VOIP completing, and then I will be pleased to be shot of any copper connection to BT. Outgoing calls are working already, inbound is to switch on Tuesday.

And we're in. So much still to do, but we need to move on the "other place" before the market dies off.

no, more like this: https://www.amazon.co.uk/150mm-White-Window-Plastic-Capping/dp/B077SYJZNH

bit of bullnose pvc cut to suit.

Acorn nut instead of ordinary one?

https://www.toolstation.com/screws-fixings/galvanised-nails/c107 "bright" means raw uncoated metal. edit: and these for the joist hangers https://www.toolstation.com/sheradised-joist-hanger-nail/p96841

yep, had this too. Shame, as some other brands can be unscrewed to make removal easier /ducks

It's a similar scheme to my own, but as well as using a Laddomat-style load unit, I've also chosen to use a stove with a cooling coil in it for boil protection. You might want to consider this safety aspect yourself- maybe using an STS valve to supply cold mains to the bottom of the store in the case of a catastrophic overheat?

the flat roof is level with- or slightly above- the roof peak?

prices don't look too bad to be but will you be actually saving very much once you get all the mounting kit locally, and deal with any Duties and the onward freight from "London Port"?