SteamyTea

Makes it look liker a crime scene. Tape the joints up with some of this.

It is always nice to go for the easy solution, which is what probably happened when it was fitted. Can you just bring the fitting of a newer system forward as it is going to be redone anyway.

Welcome Seems an odd priority list to me, other may think differently. If that is just resistance heating, then it could cost you 3 times more than running through a heat pump. You can get Air to Air Heat Pumps for space heating and Exhaust Air Heat Pumps for water heating. Those two could be an option. As you don't want to fit an UFH system, what levels or floor insulation are you fitting?

What sort of system do you already have, vented, unvented, combi. If you had a pump, why not just replace it. I put a twin impellor pump on my hot water for the bath/shower, 16 years ago, not had to touch it since. It was the cheapest pump from Screwfix, about £100.

Many materials have chemicals added to them to help the manufacturing process. Some MDF have a resin that bonds to timber, but rejects water. This is because one end of the molecule hydrophobic (non polar), this rejects water (polar), and other materials that have the same electrical charge.

When he drives a car does he accelerate in the lowest gear possible up to the red line, then hit the brakes, then does it over and over again. I do the long journey up to Buckinghamshire every couple of weeks, always amazed me, on the motorway, the number of cars that have no traffic in front of them that keep apply the brakes, for no obvious reason.

They have fire retardants put in them. Though there is a review going on about how good after the Grenfell fire. Worth checking what the rules are in France, especially Paris, if they are different.

Some MDF has a release agent built in, why it is not used to reinforce composite plastic parts.

I think it is always worth insulating, especially a North wall as that gets very little sunshine on it. As for what sort, it is usual to use a sheet foam, a fireproof one.

Read up on how to make an old building airtight first, then the MVHR becomes simple, you may get away with dMVHR then.

It is, indirectly, with a GWP of 5.8. https://agage.mit.edu/publications/global-environmental-impacts-hydrogen-economy Water vapour has a GWP of 0.001 and 0.0005 over 100 years. https://ui.adsabs.harvard.edu/abs/2018AGUFM.A21H2774S/abstract It is easy to get GWP and radiative forcings mixed up.

Not really, it is much more complicated than that as it is not really stratification at all. There is a mean temperature gradient, but that changes with the mean temperature. Why I suggested that you look for another solution.

Then the company needs to look at its medium term viability. These are exactly the same things I hear and see down here, except we have 5 million visitor days a year, so a much bigger problem. What is not a real problem is the number of holiday lets, in reality they make up a tiny fraction of the whole, though people often say that it is the biggest problem and that 'nearly all house' are holiday lets. If renting, of any sort, in any area, is a problem, and it seems to be so, then the problem is lack of building, not really anything else. Near me there was a proposal to put in 1100 houses, there was strong opposition, and it got turned down at the planning stage. They still built 1100 houses, just dispersed around the same locality. All that did was increase the price of building, which is not what is wanted. I often wish they would build a new town down here, so 250k units over a few years. If planned right it could be quite nice and not take up much room. If each 'plot' including services took up 625 m2, then that would be 160 km2, 4.5% of the land area.

Then one of two things needs to happen. Build them accommodation or pay them more. The one of two things needs to happen, pay them more or the business owner needs to get a better business plan i.e. do they have a viable business. What was the rational for turning down suitable candidates, other than they were not local? Sounds like a bad policy to me, or bad business ethics.

Most hydrogen would be passed through a fuel cell, not burnt. Combustion technologies have really poor efficiency. Fuel cells are not that much better. https://www.linquip.com/blog/efficiency-of-fuel-cell/ There is a reason they are called 'fool cells'.

Can you fit a sub meter for that supply, then at least you know what is going where. And while the power is off, fit one to monitor just the heat pump.

Or cussedness/stubbornness.

Market distortion happens everywhere, it is how markets work. If a local sells a house, say for £200k, and that place becomes a holiday let, then there is potential an extra £200k in the local economy. Say that holiday let raises £20k/year in revenue, it still takes a decade before it has recouped the original amount. But you have to add to the original £200k any money that the visitors spend locally, say another £20k/year. I think the real problem is locals don't want to get extra properties built. As you well know I am all for more house building in all places. I often wonder why people are so against new developments.

Not since the Rwanda policy. It often shows an ignorant disregard for failed ideas. Think Zoot and running his heat pump, he refused to try anything that was suggested.

Isn't it like the best time planting a tree. 40 years ago, or today.

As I was laying in the bath just now, I wondered it you could use the bathroom humidity changes as a trigger to check and control the DHW heating. I think there was someone that did this for the boost on their MVHR, if I remember, if the RH increased by 5% over a set time period (say 5 minutes), then the MVHR went onto boost. This got around the problem of it boosting (the whole house) unnecessarily.

Not read all the replies properly, but what you are trying/hoping to achieve is not simple, prediction of known usage at unknown times. This is usually done statistically with the Poisson Distribution. To quote Wikipedia. Poisson Distribution "In probability theory and statistics, the Poisson distribution is a discrete probability distribution that expresses the probability of a given number of events occurring in a fixed interval of time if these events occur with a known constant mean rate and independently of the time since the last event. It can also be used for the number of events in other types of intervals than time, and in dimension greater than 1 (e.g, number of events in a given area or volume)." With enough collected data, several years in this case, you may spot a pattern, but I doubt it. It is like stotting a pattern is cloud coverage, some time in the future, based on only the cloud coverage from the past i.e. ignoring temperature, wind speed and direction, air pressure, time of year, latitude and longitude etc. I have tried to do that, and only got a null result. You may be able to set up a warning but looking at pipe flow temperatures and how they change i.e. anomalies between the last half hour ∆T of the hot and cold pipes. But I am not sure what you would really gain. Why do you only heat water on a schedule? Why not just keep it topped up when it goes below a threshold i.e. DHW priority. Not as if gas is on a ToU tariff. You could lock it out during certain times i.e. when sleeping if it is noisy.

I think they can all be done without combustion, adding carbon to iron, to make steels is still a high carbon process though. Rather missing the point. Why make an unnecessary mess, just to clean some of it up.

I meant the paperwork to sell a house, not when it has been sold.