Dave Jones

these are what we are using https://www.bpcventilation.com/panasonic-fan-coil-unit

maybe yout tank can take 2 immersions, can leave the boiler one as is and add another driven by eddi ?

Buffers kill efficiecny so no to that, have a LOT of ufh like 1.5km as its 100mm spaced which they tell me is more than enough so buffer not needed. Just cooling the slab makes a massive difference downstairs, basically any solar accumulation is negated. We have big bifolds which catch the sun all day, the floor would be very warm without it. Here is home assistant app, it pulls the date direct from the aquaera heat pump. The fancoils are not aircon by any means but cost virtually nothing to run as its only spinning a tiny fan through a plate heat exchanger. I left them on 24x7 with 16c flow and the bedrooms were very comfortable. MVHR we commissioning tomorrow, not expecting anything from the heat battery really but anything helps right. More for winter use.

It's the other way round. We have this exact setup working at the moment with 7 fancoils and UFH coil. We have the ASHP setup (we use Home Assistant to automate everything) to provide cooling 2c above the current dewpoint running 24x7. Dont need it for DHW as eddi and solar more than takes care of that. The fancoils (panansonic) can individually be turned on and off. Thy are just dumb radiuators at the end of the day all your controlling is a fan. Commissioning the Zehnder unit the weekend which has the intake cooling/heating battery also in the ASHP loop so will see how that assists as well.

use pozi's.

get an indemnity policy to cover it. cheap as chips

simple rectangle box, you may need to drop a couple grand on an SE to spec the retaining wall but the build is pretty simple. ie 150mm cavity make sure pozi joists are specced at least 225mm deep so you can get ducting/soil pipes through minimum of 150mm insulation, 75mm screed below DPC get SAP calcs done these will specify insulation and critical elements such as lintels, cold bridging spots etc will have to fireboard the garage as its below your living area. Not sure why there is a cavity wall shown between garage and hall but its wasted space. simple block build really that should go up fast.

the way the eddi works, it takes over control of the immersion so its not longer wired to the heat pump. it can take a signal from the heat pump to turn it on.

and treble the price.

extensions have less strict regs applying so you can get away with 100mm cav and mineral batts (cheapest). New build you can still use 100mm and celotex but this is a worse and mor expensive build solution than 150mm cav and mineral batts.

and keep the fence post conc 100mm below your slab level so they sail over the top.

we packed the underside of the stairs with leftover loftroll before boarding, made a massive difference to the sound.

You dont actually need construction drawings done by a 'professional'. Depending on your enthusiasm you can just use planning drawings, elevations and floor plans. These are enough to get it QS'd as long as you fill in some blanks. Build type, materials to be used, foundation type etc SE is only needed if your footings are non standard or you need steels. Everything else BCO can do. Put up your plans so we can have a look, no point blowing £18k on useless architects drawings which will be wrong anyway when it comes to build them.

good example of a year long build, wasting the only tiny benefit of a mega expensive shed build which is speed.

another + for render and timber as outside skin .........

is the floor or the walls out of level ? Have you checked its square ?

stairbox top quality oak 2500

d4 expanding glue, can put a couple screws on the starter row. I never bothered with any more anywhere. Floor is rock solid.

is it shared with anyone else ? Guessing it is otherwise you could simply move it. In which case its more than likely adopted and you will need build over permission.

dont do it. cheapest 1 bed renter you can find is infinitely better.

using a switchbot, 2 actually, 1 upstairs 1 down. https://uk.switch-bot.com/pages/switchbot-meter-plus Made a simple automation to fire the Aquera and move target temp to dewpoint+2

using buildzone for warranty only and no issues. Local authority for building control as they spend a maximum of 60 seconds on site.

vapour barrier wont help. I have set our to be dew point +2c automatically in home assistant.

exactly what i did with our aquera. Home Assistant gives more control over it than the Panasonic app!

carpet on it!