ProDave

Yes indeed they do. When mine sits idle, it uses almost no power. I meter the energy used by the ASHP using an old dual rate electricity meter, one rate for DHW and one rate for heating. Actually the way the metering is switched that is one reading on the meter meters DHW use and the other reading on the meter meters "all other" use, i.e. whenever it is not heating DHW. Now at this time of year, with the heating off, it seems to be clocking up just under 1kWh per week. which calculates at 6W background load. I will settle for that.

SERIOUSLY look at instead installing a small waste treatment plant. Not very much more expensive, no larger, and the drainage field can be about 20% smaller. Far cleaner output and much less likely to clog the drainage field. The only downside is needing an electricity supply so need to run a cable to it. If you take this advice, choose one that works with an air blower and not one that has moving mechanical parts.

Before or after finishing the bathroom? Is THIS thread really 4 years old?

That's not a "tank" but an expansion vessel.

Just checked, my outer panes are "safety toughened" and inner panes are "safety laminated" both with respective EN numbers.

We have several "low level" windows, and glazed doors, and all BC were interested in was looking at the markings on the glass units to confirm they were toughened glass.

What do you call "cold weather"? Mine has never frozen even the night it got to -18, and -10 is common here. The only "issue" I have is a few drips of condensation running off the inlet pipe as the lagging on it is not as good as it could be. but that is not an MVHR issue. If you clean the filters, no much should get to the enthalpy heat exchanger core.

The moral of that story is when viewing as house, go the the middle of each room and jump up and down......

You seal the gap around the pipe in the top of the stove with a small tin of fire cement.

And a sign of my lateral thinking. I came by it at a previous employer, on a scrap truck outside a lab being cleared out. I "borrowed" it and over a lunch break found the fault and repaired it. Having repaired it so I knew it would work, I undid the repair and sent it off to the appropriate channel to buy it as electronic scrap. Then as soon as I got it home I knew how to repair it.

What insurance is in place to cover the build? could that not cover the "site hut" garage

My experience has been a surveyor will only note and comment on what he sees. so room in roof, which is common here, unless the walls are showing damp then they just make an assumption about what is behind them. The difference between a new build with this spray foam and an old house, is you can be more certain a new build has been done properly with for example a sarking board and appropriate membranes so the foam is not in contact with the underside of the tiles.

And part of the problem has been created by some of the installers who actually market this product as a way to patch up an old roof effectively "sticking" the tiles in place so they won't slip.

You learn something every day. Like for minimum "off" power demand, you want to choose an ASHP with a scroll compressor. If that is a genuine advantage, I am surprised those that use scroll compressors don't make a big thing of it?

If this is just for a French drain, I would have thought you could excavate carefully around / under it and install your French drain as planned with this pipe passing through. I would guess this is a vent pipe?

SW is possibly surge water? A rainwater runoff system? What are you starting to build? if it's just decking, it might not be an issue?

I find it more important to activate boost when showering, so it there is only one controller, upstairs between the bathrooms.

I bought a cheap energy monitor and found it to be totally useless with PV and an immersion heater diverter. It seemed to be summing the generated power and the imported power and coming up with a big number when in fact it was at equiulibrium with nothing being exported.

Well done. I would hold back on claim #2 until you have the money for claim #1 in your bank account.

It would be very odd for an AKO drain to drain into a foul waste system, that would as a minimum need to connect via a trap. Even if it does, kitchen sink water might be left standing in the drain if it does not have a decent fall and could get smelly in summer. But most important is what building control will say, I expect they will not approve it. Dig a channel across the drive and lay a proper foul drain for the kitchen waste.

A circulating pump running all the time could use 200W, and that should be obvious by the small noise it makes.

You need to get a clamp on ammeter and investigate what system component is drawing the rogue power.

Hi and welcome. First question is what do your planning laws say about changing use from a holiday home to permanent residence? That would need planning permission here. And what do building regs say about a renovation? Again here, that would require a building warrant and the finished house complying with current regs. If the paperwork does not cause you grief / expense / delay then it sounds like a fun project. It should be pretty easy to repair the frame re clad and insulate from the inside to make a decent building.

Is it really 200W continuous? or 200W averaged over a period? I think we determined on another thread, the Ecodan when it does it's automatic frost protection circulation turns on either the resistance heater or the heat pump itself so will briefly consume a lot more power.

What temperature do you heat the water in the TS to with the ASHP? With our UVC we heat it to 48 degrees. I strongly suspect if you only heated a TS to 48 degrees, you would not get much water out before the temperature was no longer hot enough.