Pseusmyd

My Vaillant advanced installer used a Hager 32A RCBO. Works well and no issues. Hope that helps.

Interesting issue! A pin prick would be the easiest solution but I would leave it as a last resort. Depending on the distance where your “pool” is located, have you thought of using a garden hose attached to a hover trying to suck out as much as you can? The remaining water could evaporate by blowing / sucking air through it with a fan etc?

All, thank you for your comments and suggestions. it makes sense not to insulate the loft floor and I will “ignore” my builders recommendation ref the additional insulation. @the_r_sole Your idea makes sense but senior management at home decided it was a must for her to have a mini loft for storage space... The rooms will be still 2m45 height so not too bad.

I am currently converting my bungalow into a 4 bed house including a flat roof of around 35m2. This flat roof has been designed by the architect as a warm roof. It will be well insulated but not passive. A flat roof had to be installed vs a pitch roof due to planning restrictions. Below the flat roof will be a “mini” loft of around 900mm height. This loft will hold both supply and extract manifolds and ducting running towards the rooms. De loft has been designed by the architect without insulation between the bedrooms and the loft, just plasterboard on 2x4 joists. My builder has suggested to install insulation in the loft floor to reduce heat transfer from bedrooms to loft. if I could pick your brain, would this loft floor insulation affect the “warm” loft and the uninsulated manifold and ducting? Has anyone has any experience with a warm room and a insulated loft floor. Any suggestions or comments are appreciated.

Thank you #jfb

Both ducts, manifolds and unit are inside of the thermal envelope. The ducting has an almost smooth white inner bacterial liner. Re-reading my initial post, I should have rephrased it at almost smooth.

Part of my MVHR installation is the installation of 2 extract ducts from my ground floor wetroom. This wetroom always generates a high content of moisture while using the large rain shower. The wetroom is 12m2, all tiled round and due to the “cold” tiles, it seems this increases the moisture content to a steamy room which we don’t mind at all. The current wall fan to the outside does its job to clear the room, normally within half an hour but this one will be blocked up. 2 extract ducts from a single valve are planned to be installed towards the extract manifold. Both ducts will run for about 4 meters horizontal through easijoist, than 3 meters vertical up before it reaches the manifold in the warm loft. My concern is the amount of (excess) moisture in the ductwork, particularly the possibility of standing water (small pipe ridges) in the horizontal run, creating mould etc in the long run. The horizontal run has only a minimal incline before the vertical run up. Has anyone else had any experience with high moisture from their wetroom affecting the ductwork or manifold? May be I am too over concerned? The system: Zehnder Q600 with Ubbink 76/93mm anti bacterial ducting.

Thank you, It looks complicated but I will give it a try.

Thank you all for the replies. The property will be well insulated, well above building regs standards as stated in the specification document designed by my architect. I am currently on furlough and foaming every crack and hole I can find before the insulated plasterboard gets installed by my contractor. Very good questions, the honest answers is.....if I would do it again, it will be a knock down and rebuild. Currently the refurb will be cheaper but I agree, compromises had too be made. Water pressure is very good on site.

Just posted my 1st post in "Designing Energy Efficient & Sustainable Homes" As I have been browsing this forum for a while, I would like to thank you all for all the wealth of information. It really helped to support the start of my large refurbisment from a bungelow into a 5 bedroom house!

I have been browsing this forum for a while and I would like to thank you all for the excellent posts which contain a wealth of information. Please keep going as they are very useful. Currently, I am at the start of refurbishing a bungalow to a 5 bedroom house (280m2) which gives me the perfect opportunity to review my heating and energy saving requirements. During this large refurbishment, I will be installing a MVHR system (Zehnder Q600) and a 5.5KW solar array. Downstairs will be wet UFH for about 70% over a newly installed slab, the rest 30% will be radiators over the suspended floors. Upstairs will be 100% radiators. To configure how I would like my CH and DHW, I invited a couple of heating engineers to discuss my requirements. The following suggestions were giving; 1. System boiler with one large unvented tank for UFH, radiators and DHW. Use of an immersun / iBoost. 2. System boiler with one large unvented tank for UFH, radiators and DHW. Use of an immersun / iBoost and ASHP. 3. Using the existing 38KW combi boiler for DHW. Install a system boiler with an unvented tank with an immersun / iBoost for UFH, radiators and an ASHP. An ASHP has not been budgeted-in for the moment. Would installing 2x28mm to the outside be a good option for later? Would I need low temperature radiators for now? Will it work for later as the ASHP runs at a lower temp? So, if you had to start from scratch, how would you configure your system?