jack

I've figured out the motor (EBM Pabst R3G190-RG19-22 (previously R3G190-RC05-09)), but can't find out anything about the bearings. It seems Brink would prefer you buy a new motor for several hundred quid rather than replace the bearings. Thanks Nick. I've shot off emails to EBM Pabst and the UK supplier, but am not particularly expecting a positive reply (if any) before the new year anyway. If you know someone who could give you the necessary info, that'd be great. There's no particular rush, thanks!

See if you can find recycled railway ballast. We used it under our raft foundations. Make sure you get the cleaned version.

The fans on my 9 year old Brink Excellent 400 have been slowly getting noisier, so I'm going to replace them. Our unit is installed in such a way that it's going to be a complete bear to get to the motors so I can replace the bearings. I'd therefore like to order the bearings before I take the unit apart, so I can do the whole job on the same day. Does anyone happen to know what size and number of bearings Brink uses on these units? I could contact Brink, but I expect they're closed until the new year, and I can't find anything about it online. @Nickfromwales, is this something you've encountered? Thanks.

Yes, I think some of them can. In my case, even 2 x 7 kW car chargers and the ASHP pump running flat chat on top of ordinary background loads wouldn't take me anywhere near the limit.

Diversity.

If they did calculations, then they ought to be able to present them and explain their maths. You've paid for it, so demand they show their working. 40 kW is 166 A. Like you're planning, I have a "big house all electric" (290 m2, 5 kW ASHP, 7.2 kW car charger, 3 ovens + induction hob) and my very conservative electrician was more than happy with our existing 100 A supply.

What are you running that could possibly consume 40 kW given you're talking about a max 7 kW heating system? Are you planning something like a 22 kW charger for a car?

@GTM_88, I've moved your original post to the underfloor heating subforum, as it's turned into a heating discussion rather than an intro. You're likely to get more input here, as a lot of members don't monitor the Introductions subforum. There's a link to the new thread location in the Introductions subforum, so people who've already replied can find the thread easily.

Welcome to BuildHub. What a great intro! As you've seen, lots of our members enjoy getting back to first principles when it comes to working with things like UFH, MVHR, ASHPs and the like, especially where there's a novel angle (like UFH in a boat).

Hi Joe BuildHub is a strictly non-commercial forum. As such, the sharing of business names, websites, and email addresses isn't allowed. We've therefore deleted the rest of your post, which read as an ad for the business you work for. That said, we do welcome members who work in the building and related trades. The way to approach it is to take a long term view of your membership. Share knowledge and offer advice based on your skills and experience. Once people realise that you know what you're talking about and might be able to help them solve their problems, they'll find you via the private messaging system. Plenty of members have had business through the forum with this approach, without falling foul of the "no commercial posts" rule. It just requires taking a slightly longer view. Good luck.

This is slightly different. I thought from your first post that you'd paid for them and were going to re-use them. It's probably still fine to do what you've done. It's hard for a company that isn't trading any more to sue you for copyright infringement!

Submit them. If they find out and complain, and can explain why what you're doing is in breach, they can threaten to sue you for damages. IANAL, but presumably damages are realistically likely to be no more than the original charge for the report (or their current charge for the same, not that that's relevant if they're no longer trading).

Welcome to BuildHub. There are definitely at least a few BuildHub members who used 200+ mm concrete slabs in a raft construction. More common is a nominally 100 mm reinforced slab on a raft with 200-300 mm of EPS underneath. However, by the time you factor in a 300mm deep ringbeam, 200 mm deeper reinforcement ribs and 200 mm deep reinforcement areas for structural walls, the average thickness is actually much higher than the nominal 100 mm would suggest. Overall, the performance of a flat 200 mm slab probably isn't that far off a 100 mm slab with all the extra deep bits. Try these two Google searches for more info: https://www.google.com/search?hl=en&q=250mm slab raft site%3Abuildhub.org.uk https://www.google.com/search?hl=en&q=200mm slab raft site%3Abuildhub.org.uk

Summer bypass also takes into account the outdoor air temp. The settings on ours let you set the exterior temp above which the summer bypass will operate (if the indoor air temp is higher than the outdoor temp). Ignoring summer bypass, MVHR tries to maintain any temperature difference that exists between the inside and the outside. If you have the heating on in winter, or the cooling on in summer, such that you've pushed your house temperature up or down in a direction that makes it more comfortable than the outside temperature, then you want the MVHR operating in its normal (non-bypass) mode. It will stop your hard-won heat/coolth from being lost to the outside through ventilation. In summer, when the temperature outside drops below your house's internal temperature (in the evening, say), but is still above a threshold temp, the summer bypass kicks in. Instead of operating to maintain the temperature difference, the MVHR ejects warm air from the house and draws in cooler air from outside. Nothing special happens. Assuming it's cooler inside than outside because of the operation of the UFH, then the MVHR will try to maintain that temperature difference. Some people turn down the ventilation rate when it's very cold or hot outside. That reduces energy losses due to the large temperature difference between the inside and outside. It also reduces how much moisture is taken out of the air in winter. Overventilation when it's very cold can result in very low humidity inside.

That's the plan, in conjunction with screens in at least the bedrooms to encourage stack ventilation (assuming I eventually manage to fix the electric rooflight opener - yet another thing on the to-do list).

I didn't get much mould for the first few years, but as time's gone by, I get increasing amounts building up every year. You've reminded me I need to do my annual clean. If I remember, I'll drop a photo (if it isn't too disgusting!) into the thread.

We run water through our UFH at around 15 deg C and get a breath of condensation (not enough to drip) on the metal parts of the UFH manifold. From memory, that gives us a floor surface temperature of around 19 deg C. Although the air temp tends to still be quite warm during long hot spells, walking around in bare feet or socks seems to cool me down out of all proportion to the amount of contact area with the floor. Walking into the house on a hot day feels like walking into a cave. Lying down on the floor when you get back after exercising in hot weather is absolute bliss! This is all downstairs. There's no cooling upstairs, and during longer periods of hot weather, I do wish we'd installed some form of cooling, whether fan coils or aircon. The other thing that I think is even more important is insect screens. Even during very hot weather, most nights the temperature outside drops well below the interior temperature. If we had insect screens we'd be able to open all the windows upstairs and let out a lot of the heat that's built up during the day. Retrofitting insect screens is on my increasingly long list of things to do.

It's worse than that: the council at leasty implies that mitigation measures wouldn't be allowed:

And they wonder why planners have a bad name. How do "formalised space" and "unneighbourly" map to the requirements of planning law? Similarly, I don't see how "engineering works" have anything to do with the need for a planning application. You built a small(?) retaining wall (planning not needed), replaced the paving over a slightly larger area (no planning needed), and didn't raise the level (no planning needed). I agree that it all sounds like complete nonsense, and I'm sorry you're having to deal with it. Depending on your appetite for stress, I'd be tempted to write back and tell them that you look forward to them initiating enforcement action based on the actual planning laws of which you're alleged to be in breach.

Thanks. I appreciate it takes some navigating at first!

Can you please repost your question over in the planning sub-forum? https://forum.buildhub.org.uk/forum/108-planning-permission/ A lot of members don't read posts in the Introduce Yourself section. It's also helpful for future readers for discussions about specific topics to be in the right sub-forum rather than in this section. Thanks Jack

Let me know which post and what you want edited and I'll do it for you.

Welcome. Head over the planning sub-forum and have a read. Lots of good info over there. If you have specific issues, ask away.

Existing members posting commercial links in the context of research and recommendations is fine. It's just people advertising that we don't allow. I agree that the gap will close as more people (and eventually grid-scale storage) absorb cheap energy at offpeak times for re-use when it's expensive. However, relatively few households installed solar when the government was guaranteeing two decades of index-linked payments. Financial conditions for most people are worse now and I don't see them improving in the near future. Even if battery prices continue to fall there're still additional costs associated with installation that won't get much cheaper. I just don't see vast numbers of people getting into battery tech in the near term. Also, there's some complexity around operating these systems in a way that takes full advantage of the time of day pricing. I'm sure set and forget systems are on their way, but we still have some time. People are generally not that interested - look at how few people building an extension bother spending 10 minutes researching what insulation to put under their new UFH system. Overall, I doubt there's much risk of the market changing so much in the next 3-5 years that ToU tariffs won't still offer an arbitrage opportunity. For some of these systems that's the entire payback time. With a decent solar array, you almost certainly get more time before the financials deteriorate. Personally, I'm very close to the point where installing a decent battery system makes sense. Just need to find the time to research the options (the massive number of which is another impediment to mass-market uptake!)

Factoring in only your own use may undersell the financial case. If you're on a true ToU tariff such as Octopus Agile, my understanding is that the best option is to discharge when the grid is paying the most (typically early evening in winter), rather than solely maximising your own self-consumption. This approach can offer better financial results, albeit at the cost of additional complexity.