Gone West

That is something I looked at when designing my new build. I looked at the Rehau system which used silver plated ducting to kill off any bugs, but it was too expensive. That was sixteen years ago though, so things might have improved.

I think if I lived in the Netherlands I would rather buy from inside the EU.

We had a Genvex combined unit, but I think others on here have used standard Genvex MVHR units. Ours worked well and was straightforward to set up.

It's a shame Zoot that you aren't able to understand that your way of wanting to heat your type of house is 'fundamentally absurdly wasteful'. By letting the rooms cool down over night you would then be using more energy to heat them up again the next day, rather than leaving them heated all the time. If you want to heat a house that way you should move to a more modern house. As I have said before my house is a very similar type of construction to yours and is in a very damp part of the country, it is heated 24/7 and kept at 23C. It's not cheap but a 30kW oil fired Aga does the job.

So why don't you sell it and get a 30kW oil boiler, then you can run it the way you want to heat your house, no problems.

Is that a 3D printed transparent cover on the box? I didn't know you could print clear plastic.

Don't know what it was made from, but they were little honey coloured granules/balls. I liked the smell when I was a kid.

My father used "animal glue" in the 1950s, which he heated up in a metal pot inside a water filled pot. In the 1960s he started using the more modern Cascamite.

Twist the knife, why don't you 😀. I videoed the pour, and saw the concrete was going off before it was laid and there were voids forming. We had the slab tested for voids and several were found, so they took core samples and condemed it. All because they wanted to save money by not having to use a pump. So much easier the second time. Fortunately it didn't cost us a penny, but we did lose a couple of weeks.

Indeed!!

I can't say accurately. All I know is between 22/1/22 and 4/12/25 we used roughly 10800 litres of oil which works out at an average around 7.6 litres a day for hot water and heating using the old Aga which is around 70% efficient. Plan to replace the Aga with a new condensing oil boiler this year.

Is to have a sufficiently large enough heater. The walls in our place are 600mm to 700mm thick stone and when we first moved in we had our 30kW oil fired Aga heating on all the time, in the Spring, to dry it out and warm it up. The house didn't feel comfortable for a long time as the heat was drying the fabric of the building. @SteamyTea explained how much energy is required to do this, and it was substantial. We now have a house that is 23C all the time. You can warm the house up, but it requires a lot of constant expensive heating to do so, and it has to be maintained. Trying to heat one room for a few hours, in your type of house, is pointless.

I used one of those Mcalpine hose connectors and mine had a hole in the top in the centre, which acted as an air break.

When we moved in we had the 4" wall cavity and the loft joist cavity filled with blown mineral fibre insulation. The amount of oil burnt dropped dramatically!! Lucky we did, as the build took eight years not the estimated two to three years.

All I can say is, on my timber frame build, i didn't use any tapes or membranes for airtightness. For windows and doors I used two strips of Combriband and the Soudal SWS foam system on the inside. It achieved an average 0.47 ACH without any tweaks. It just requires care.