Install of a largish MyEnergi Libbi battery

[Swwils]

Who cares about the grant?

MCS gravy train stops soon anyways and finally we will be rid of this ridiculous assumption that a HP should be sized to cover 100% heat load.

[Stinsy]

Who cares about the grant?

MCS gravy train stops soon anyways and finally we will be rid of this ridiculous assumption that a HP should be sized to cover 100% heat load.

^this!

[Countrypaul]

There are four legacy UFH zones but I expect it to operate during the day on weather comp with all zones open.

Vaillant provides the usual DHW priority, with a programmable max duration. When the TS and DHW are up to 55C the control will revert to the UFH at <45C flow, this should happen by 0700 when E7 goes off. Meanwhile the bedroom rads will get 55C flow from the TS.

Afternoons there is the best chance of surplus PV, if not the outside air will be at its warmest and little requirement for space heating, the TS will recharge ready to heat the bedroom again before we go to bed while the UFH continues to keep the downstairs warm or maybe on setback.

Will that be OK or is there an underlying problem<g>?

PS I sympathise with yr Polish plumber, I don't like the wet trades, am happiest with carpentry, plumbing and electrics in equal measure. My bricklaying looks OK but is too slow to be useful on anything bigger than a bike shed, plastering a total no-no.

I'm not sure if there is a problem as I'm having difficulty working out all the scenarios and the consequences. I think you probably need to create a state diagram to see if anything results in effects you are not expecting. For example when you say you expect it to operate on weather comp, is that just the UFH or the ASHP or both?

When it's sunny we often find the kitchen floor temp appears well above ambient whre it is in direct sunshine and he kitchen can be warmer than expected.

We dont have any heating in the bedrooms, but if it is very cold out, put secondary heating (electric heaters) on for the relatively short periods required.

Our ASHP was MCS installed, but it was based on the EPC which is very inacurate, for example only allows for DG windows not TG, the surveyor had to have proof of CWI by looking for the drill holes, but ours was installed from the inside before plastering so none visible, luckily some insulation had escaped under the ground floor where there is a "basement" so he could photograph that as proof. The result was that the EPC came out much poorer than reality, and the MCS calculation said we needed 10.2 kW of heating at -3C when I knew from the previous winter 6kW was ample, as a result we have a 12kW ASHP that I believe is much larger than necessary.

Our plumber was very happy plastering and did the bathrooms and various patches where we had to redo areas for various reasons. I laid a few bricks under supervision of the brickies, but also put in the stone cills for some windows, I also plastered one bathroom wall and various small patches (again where for various reasons had to make holes in the plaster). Like you I prefer carpentry, plumbing, electrics and painting.

[sharpener]

MCS gravy train stops soon anyways

Care to provide a reference for this assertion?

[Swwils]

BUS runs til 2025 and it's the main grant the requires MCS since there was nothing else to really pin it to when developed.

MCS have until then to essentially become a household name or they fade into the background like every other bit of paper.

Many have now figured out having MCS doesn't demonstrate competency or even good results.

[sharpener]

Many have now figured out having MCS doesn't demonstrate competency or even good results.

+1 for that.
Unfortunately its now enshrined in the planning process as well, HP installation is only Permitted Development if you use an MCS installer and install according to MCS rules.

[Swwils]

Many have now figured out having MCS doesn't demonstrate competency or even good results.

+1 for that.
Unfortunately its now enshrined in the planning process as well, HP installation is only Permitted Development if you use an MCS installer and install according to MCS rules.

I don't think that will stand up to the first challenge against it, just like for SEG payments.

[Tinbum]

Many have now figured out having MCS doesn't demonstrate competency or even good results.

I figured that out over 10 years ago along with nearly every other scheme like that and grants..

[sharpener]

Many have now figured out having MCS doesn't demonstrate competency or even good results.

+1 for that.
Unfortunately its now enshrined in the planning process as well, HP installation is only Permitted Development if you use an MCS installer and install according to MCS rules.

I don't think that will stand up to the first challenge against it, just like for SEG payments.

Maybe not but so far as I know there have been no test cases. I am not willing to be the guinea-pig so I have applied for PP.

BUS runs til 2025 and it's the main grant the requires MCS since there was nothing else to really pin it to when developed.

MCS have until then to essentially become a household name or they fade into the background like every other bit of paper.

They seem thoroughly entrenched now, and show no signs of relinquishing their 10+ year hold on the PV market. Octopus and others require MCS for SEG payments even though there is no statutory basis for this. DESNZ like the idea of consumer protection so will want some "independent" body involved in whatever future schemes there are, even though we all know it is a mirage and the only thing it protects is their own members.

[Swwils]

Octopus say they require it but actually don't when pressed.

Its a different ball game with grants, those pockets want results.

Consumer protection is separate from MCS, MCS just accredit it all.

Its all sourced in complexity... Training centres, awarding body who issues the certificate, certification body (who don't give certs lol) e.g. the scheme does the audits, the consumer code, MCS on top and now the curveball £5000 bond confusion as well.

None of it guarantees results or competence.

Would you stay with MCS if it wasn't a condition of a subsidy? Not as concrete as they would like to think.