dpmiller

Might be worth having a look at Shaun's site. The only thing that's changed since I dealt with him is that he's moved to a subscription model to search his range of offerings... https://irish-house-plans.ie/ All I can say is that getting design and drawings, plus then using a skilled local Consultant for our application which was a change of design, but in an ASSI/AONB, all ended up around the same cost you propose.

Our case may or may not be a bit different to most- we'd decided early on that we would be happy with an off-the peg design from one of the "book plan" providers that there are a few of over here, as we perceived that the local Architects either provided something akin to a developer-grade scheme or the kind of Grand Designs jobbie that was far too sharp and extreme for our tastes. We chose a design, I made contact with the gent asking if he could provide the plan reversed and with a couple of changes. After a to-and-fro he ended up doing a ground-up bespoke design for us, based on my views and requirements. He did 3d and video renderings, and after providing planning drawings for our Planning Consultant, subsequently appended them with extra notation for Building Control. Only PDFs were required or provided. Neither the TF company nor their SE, nor BPC when they were doing the MVHR design, needed anything other than the PDF...

at the expense of the machine moving around more, not less

Personally I'd trust the manufacturer to engineer the drum suspension and AV feet as a system and not add any more spring under the feet?

Does your heat pump also control- or have an internal- immersion heater?

looks like rebranded Patio Magic

We were lucky enough to use the services of someone trained in NZ- where architects are seemingly more broadly trained in engineering and buildability, and not as focused on the money...

OK for @Conor, @Marvin and anyone one else that happens to trip over this searching for info on the CE-iVT heatpumps. The function of the un-noted inputs is: ID2- "emergency stop" input , used when the controller is in a commercial fridge or similar ID4- cooling mode hard setting ID4- heating mode hard setting both ID4 and 6 override the mode chosen in User Mask Also... even tho the modes in User Mask are heat+DHW and cool+DHW, the unit can actually auto switch between these modes using the settings in page U10 of the user mask "AmbTemp switch". I'd wrongly presumed this was for bivalent boiler control...

two full rooms boarded and skimmed, and another ceiling? I'd say @nod is cheap by a factor of 2 or 3...

what brand of manifold is it? Some have an adjustable bypass on the supply side that can make the numbers look odd

so this is about 11kW, depending on configuration. The brochure is sparse on details of efficiency vs temp, is it possible that being an HT unit it'll perform better at a slightly higher LWT?

no I mean can you prove there's flow at each grille? With your restrictor setup you're working on someone else's guess... Id be dangling a bit of tissue in front of each vent or using a smoke pencil to confirm it, personally. Airflow is a funny animal, I've spent too many years measuring and setting up fumecupboards and the like, all the calcs might say there will be flow but one extra tight bend in a duct and...

if the airflow haven't been checked, you've no idea if there actually *is* flow in all and every room...

what inverter has a 1.5kV input? Surely these strings are going to be separate or series pairs at the most?

It will work but you'll never know why as it addresses both points raised here- lack of flow in the supply loop to the manifold *and* @Nickfromwales's assertion that coils don't transfer heat in this situation. In fact, just increasing the LWT in heating mode a few degrees would likely cure it too, as I think on it...

where is the "blanking plug"? It's normal for there to be a cap in place where the meter goes but it should not affect flow.

He won't even check if it's accidentally half-closed?

RCD was replaced on Page 1 was it not?

I'll drop Chris an email...

while there are stats that can be switched between heat and cool (chinesium wifi ones, for example) and some manual stats with changeover contacts, you might not actually need anything? The ASHP is just looking for the dry contact closure to turn on, so setting the heating stat to max (a programmable one, so you can choose a time period for the cooling) will bring it on and the buffer will already be at setpoint once the mode is changed on the controller. Alternatively give Chris a shout, there are a couple of undocumented inputs on the unit that might help. I've been meaning to ask myself, but it hasn't been pressing. The normal on-off control is on the "AC linkage switch" ID3, but there are also inputs ID2 "linkage" ID4 "cooling linkage" and ID6 "heating linkage"; maybe he can clarify whether these can be used as demand inputs or whether they hard code the unit to a single function on demand?

have you looked at the valve yourself?

No discrete buffer tank here, but all heating flow passes through the 35kW coil in the bottom of the thermal store.

Doesn't the surrounding volume of water act as the additional volume? The ASHP isn't measuring any volumes, it just wants a manageable DeltaT to stop short-cycling...

Monitor the temp of the pipe from the diverter valve to the DHW tank when the buffer is heating. It should drop to ambient. If not, the diverter *isn't*...

another vote for beechwood here, they're just down the road from us.