ChrisDL

I was going to ask the same question as this topic. I was planning on running 22mm hot and cold to each (15m ish will be the furthest distance to bathrooms upstairs) wet room/area of the property then branch down to 15mm for each element from a smaller manifold. Sounds like 10mm for toilets seems advisable. Is there a recommendation or preference for using PEX or polybutylene pipe? Many thanks.

16m2 is the allowed for space. But granted it will be gobbled up. Again, the preference for one unit if possible.

Thank you for the recommendations. I will follow up the suggestions.

Good to know... but as a single or double run?

Hi Dave your experience sounds unusual as I believe Zehnder are one of the most premium brands... Might go to show that I don't need to spend top £. I see few people have complaints with the Vent Axia's and buying two units could save me a lot.

This is interesting, I had wondered if a commercial unit might work... But have assumed it would be noiser and since it was likely to be in less noise sensitive areas, office, school etc. I will call them though. Did they also supply you ducting or did you use another brand for that?

Good to know. What brand unit and ducting did you end up with and are you pleased with it?

If I do end up with two units they will both be in the same central room in the home. Unfortunately no opportunity to have units either end of the house. I have measured today and the longest run to a bedroom will 16m. Which I could double up.

Yes, reading the forums this is something not to be missed and I was planning to include decent attenuators between the MVHR unit and manifolds. If all the units will sound equally quiet at the valves that is great. At the unit itself won't matter being in a laundry/utility room at the rear of the house. Reliability and efficiency are probably the other considerations. Again one large unit if it existed would mean I don't have to double up on attenuators, manifolds, supply and extract atmosphere ducting either.

Good morning, I am wondering if anyone has any recommendations for a large single MVHR unit? Or would I be better off with two? I have had some preliminary discussions and quotes from suppliers which have all recommended two units... but I guess it is in their interest to sell more! The property is quite large at 530sqm. Based on building regs 1.08 m3/hr that will equate to 572m3/hr - based on the advice I have read on this forum and running a unit at 50% I would need two, either Zhender Q600, Brink (Ubbink) Flair 600, or at the more affordable end of the spectrum Vent Axia Kinetic High Flow. I don't want to spend more than is necessary, but quietness of the system is paramount, I would hate to have buyers remorse and wish I had purchased another unit. I am about to start some calculations for duct runs to see if I will need to double up any 90mm semiflexible ducting - from the manifold to the extract/outlet the longest run would be about 15m. On a side note has anyone had any experience with Blauberg Blaufast ducting/manifolds? https://www.blauberg.co.uk/vents-ducts/semi-rigid-duct-systems ? Thanks.

Hi Nick - Yes it is the 380's.

I have also fallen foul of the Insulhub liquidation. Slightly different from some of the poor people here in the fact I have probably 3/4 of the materials to finish the house - but not enough to finish and no garage.... What is also so disappointing is the support and knowledge has been pulled from under our feet as well... I notice @Nickfromwales comments in not recommending a Woodcrete block... which is a shame since I have one! I was considering a parge coat and was relying on Insulhubs team to guide me.... unlikely to happen now I suspect. I am wondering what the recommendation to might be to those of us with a partially built project? Just mix in Nudura? Many thanks, Chris

With respects to Zoning UFH, would people recommend minimum as possible? I was thinking of running the entire downstairs as one zone. But upstairs individual thermostats for each bedroom. Depending on preference I guess.

This sounds simple and effective. Ideal. 👍

Evening all, A few weeks ago with the help of this forum I managed to get my head around my UFH requirements, link here, Thanks to @JohnMo @Adsibob @jack . Now I am looking for help regarding combining a ASHP with a backup oil boiler. Should state, we are off grid, and although we are installing a very large PV array - electricity will be our limitation in winter and hence the need for the back up oil. If anyone wants to see my heat calculations/energy requirements click here. So my first question is does anyone know of a way to control a ASHP by way of battery level or PV generation or a ASHP with the ability built in? All the ASHP I have looked at advertise a back up facility based on outside temperature. My first thoughts were I could completely switch off the the ASHP by automation when the batteries are depleted past a certain level... but I am wondering whether ASHP would suffer from being turned off/on like this? Second question, assuming I can make a ASHP work, is regarding the rest of the components. I should trust my plumber... but I would like a understanding. After much deliberation and reading on this forum I have decided on installing a UVC rather than a thermal store but I am a unsure on the buffer requirements. Below is my bare bones understanding. Do I need a buffer between the boiler/ASHP and UVC as well? Also out of interest if I decided to add a biomass boiler to the design instead/with would I need a buffer then before the UVC or before everything else?