dpmiller

2. have you checked the air pressure in the pressure vessel? Might someone have isolated the vessel? A problem here will cause the pressure to fluctuate unexpectedly

ours goes through a phased shutdown, delays to allow the valve to move over, then starts back up; ramping up as the DHW tank heats

Our guys put a treated 6x1 along the rafter ends and some day I'll clad over them...

the bottom row of tiles sit on the vent strip, no batten required?

not everywhere. Mains gas is still quite a new thing in NI and going from a vented tank/ oil boiler/ Willis combo is a steep learning curve for many...

what is the manner of the expected light pollution- out over the countryside or reflecting upwards off the hardstanding in front of the glazing? Dark Skies is all about upwards emission AFAIK. might there be some merit to an overhang/ brise soleil in terms of solar gain but also upwards transmission?

don't understand why someone who has done so much of the build wouldn't just hire a van and do a bit of graft?

for a given power consumption, lower voltages mean higher currents and so more voltage drop or "transmission losses" along the resistance of the wire.

having spent quite a number of years installing and commissioning fumecupboards and BSCs, the airflow required to achieve containment at even quite a small aperture size is large. Conversely the velocity required to allow good capture within a carbon filter is... very low. eg. a schools portable fumehood requires a sash opening of perhaps only 250x600mm (say) so that a low face velocity of 0.3m/s give reasonable containment and time for the filter to adsorb. Vs a ducted fumecupboard that will be around 1m/s average face velocity to contain within a sash opening of 450x1200mm. That's a lot of air...

does that not create smoke that needs :ahem: extracted?

completion is different to needing to pay rates surely? We're resident and "substantially" complete so LPS want their pound of flesh, but BC aren't interested in visiting until I ring'em and ask for final inspection

As it's a matched VFD I'd expect the colours codes to be a match but it's but a moment's work to swap any two phases over and re-try. it's something we see in Greater Belfast vs the rest of NI and GB, it's rare that something shipped from GB works in Belfast without swapping two wires...

that doesn't look like variable speed to me. Does the pump have some kind of pressure-control/ bypass valve internally?

drain test bungs?

a bit of tube filed down to have projecting pegs ought to do it

dripping off the chimney coping onto the back gutter. Ours do it too...

it's my perception that it's sensing the system demand more accurately, giving a bit more boost on heatup.

control on return temp is another option...

seems a bit overkill, what with insurance etc. What's wrong with a trailer?

nope, a tiny bit of flow can move heat to odd places...

have you not got a diode across the 24V coils?

isn't the choice really Openreach- Virgin- Fibrus? as they supply the infrastructure...

build it on a tray with an drain to outside?

if you can't see the aluminium, it's only a scuff. Ignore...

why can't your air-to-water cool?