joth

Did you try the Tuya mmWave offerings at all? https://www.aliexpress.com/item/1005005477612297.html much as I dislike wireless sensors, at less the £10 each they seem worth a look. it'd have to be Zigbee as their wifi models are effectively locked into dependency on their cloud service ... and some report they spam the zigbee network quite a lot. Actually... https://smarthomescene.com/blog/best-and-worst-presence-sensors-for-home-assistant/ has me looking at the Apollo Automation MSR-2. it's a little bit more ~£30 but is very interesting - native ESPHome so easy to add custom notifications, temperature built in and CO2 can be added at a very reasonable price. Just darn ugly.

2 years on, it looks like Zehnder now have an officially supported option for a local BMS/HA integration in the "ComfoConnect PRO" https://www.international.zehnder-systems.com/en/comfortable-indoor-ventilation/products/connectivity/smarthome-for-ventilation-systems/interfaces-for-smart-home Of course costs even more than the ComfoConnect LAN C, but it has modbus RTU/TCP built in. Very annoying they've in recent years they pushed FW updates to the LAN C to enable cloud service, but haven't added not modbus TCP support which would be relatively simple addition in comparison 🙄 Also funny to see "Google Protobuf public AP" listed in the table above as not supported by any device. That of course being the private API used by their app, and also used/abused by Home Assistant and Loxberry plugin to get local control over the LAN C.

So my guess... One of the main intents of BUS is to support wide scale training in domestic HP installation, hence the instance on MCS and encouraging profit taking by those with said training. Domestic plumbing is seen as a wet plumbing not F-Gas skill set and so they want people to cross train into the skills that are typically needed to maintain these things going forward

Correct, cooling is not prohibited in a bus install. The two challenges with cooling are (I) it's not allowed under permitted development, and (ii) MCS training doesn't cover cooling (MCS install being mandatory for BUS) so it's extra hard to find an installer competent to do it. In practical terms so long as you keep the cooling temperature above dew point there's not a lot of additional effort needed to support cooling.

What controls are they providing, and what do you currently use to disable/enable the conservatory zone? The one potential snag of a temporary "permanent" disconnect during the ASHP install (to reconnect after) is they disable whatever controls you have working now, and you need to redo some electrical work to get it going again. It's probably not that complicated but potentially bit of a faff for someone to have to figure out and reconnect after the fact . Anyway, the temporary disconnect is exactly what I would do (if I wasn't doing the heat pump myself, or getting a more amenable installer to do it)

Oh my oh my, welcome back! Much as I wish the reason for your return were more happy news... Your input on here was helpful for me during our build (2020/21, with all the extra challenges those years brought) I'd more than happily come over and give a hand on your replacement if you'd like an extra set of hands. Personally I'd think seriously about a uvc, fwiw.

Ok much as it horrifies me to welcome a device into my home that was previously used to monitor your comings and goings 😂, I'd be interested in this if you are letting it go. What song would you like? Feel free to DM your answer...

Is that fp2 direct to HomeKit or via their hub? (Which hub?) The advertising suggests the hub connects to everything under the sun, so a bit of a kick to hear HomeKit + frigging is required to set it up with any of those alternative platforms

Not sure that's quite right either: aiui the Green Levy applies to all three of (domestic) Gas bills, Electricity bills and Dual fuel bills. "Just 6% of a typical gas bill is from green levies, rising to 16% of an electricity bill, and 11% of the average dual fuel bill." https://eciu.net/insights/2024/are-green-levies-going-up-in-april-2024

Tell me more about the fp2 Can it send event notifications over Mqtt or a webhook? What hub do you recommend? Their website makes it out as the absolute kitchen sink of protocols but their manual and faq are offline https://www.aqara.com/eu/product/hub-m3/ I have a couple places where radar detection could be handy (e.g. the office) but one where fine grained zoning is needed (kitchen, detecting cooking vs using sink vs passing through) - I think a camera will ultimately be best there.

Great tip thank you! I got a shelly BLU recently and really unimpressed by the complexity getting it to integrate with anything outside their ecosystem. I'll grab a couple these and see how it goes The enclosure is ugly as, but seems plausible to put it into some other case.

I agree with the gist of the OP, but the discussion brings to mind a few general comments 1/ Beware of creating false dichotomies. Yes, we should be targeting homes already on resistive electric heating for upgrade to heat pumps, but that doesn't mean we shouldn't also be targeting homes combusting fossil fuels too. Both need to happen, and technically there's no reason both can't happen at once. 2/ Keep an eye on the long term goal. Sure replacing one boiler with a heat pump will not reduce scope 2 emissions for that home's heating to zero today, but the goal is net zero by 2050, not today. If it's a step towards that goal it's a step worth seriously considering. 3/ Massive scale systems change is required, not tinkering at the edges. This is a multi industry, multi decade project. Optimising each individual's personal emissions at every single step is not practical or in fact useful. What's important is on average everything trends towards net zero. Regrettable as it is, there will be examples of houses making nonoptimal choices that taken in isolation can be seen as a back step, but by moving towards renewable heat sources they are still support the systems changes needed; e.g. directing more of their ongoing spending away from gas and into electricity (and hence renewable generation projects), and supporting the economies of scale needed to reduce the cost of materials and increase training & knowledge in heat pumps.

If this is compared to an existing gas boiler, then no that's not correct. A correctly installed ASHP will reduce CO2 emissions as the COP is better than grid system losses so less combustion is needed to drive it vs burning gas directly to create heat On top of that, a portion of the electricity is from nuclear or renewables thus much lower CO2

I generally dislike doing plumbing work, and this project was no different, but it is a massive help having this chap's monotone voiceover echoing in my mind whenever I do make pipework changes. https://www.facebook.com/reel/1692555494842644?mibextid=rS40aB7S9Ucbxw6v

Do you have any room thermostats? How often are they calling for heat? If you have rooms stats, as an experiment turn them all up to maximum so the ASHP is running continuously and see how hot the ground floor room temperature gets. Then dial back the flow temperature to a level where it's just maintaining the desired temperature throughout the GF. Note the outside temperature while running the experiment, and that's one data point you should set on the weather compensation curve. Repeat when outside temperature is nicely above zero; WC curve sorted. 👍