SteamyTea

So is Durisol no airtight once the concrete is poured?

It is the programming that is the tricky bit if you have never down it before.

Yes, look at the cost of fitting roof integrated PV. It can be cheaper than tiling.

Someone made on on here, can't remember who it was, but it is basically fairly simple to do.

It is a good place to monitor the outside temperature as it is unaffected by sun direction. I have Temp and RH sensors in @joe90's MVHR, but he has not balanced it yet, and turns it off sometimes.

I flew back from Australia, 1st Class to KL, then Business Class to London. Managed to sleep for a fair slice of it, so in wasted a lot of it.

Been really quite warm down here. Still 11⁰c, was warmer down by the sea earlier.

some say it is his wallpaper. I still think it looks like Halford's typeface.

Page 71 will be just the same but with 2 people watching.

As soon as I get the cash I am up for it.

Regarding the MVHR failure risk, you can always open windows.

I think that 'must' needs to be in bold, as in always install one the correct size. I think it is a problem that came about with traditional 'plumbers'. They just do not understand how a HP works. I would think that a buffer is useful in most heating systems to help efficiency.

Shaw Taylor used to say if you see a crime to go home and forget all about it.

stick that on all the walls, then the insulation. You get best of both worlds then. Nothing to stop you filling the cavity with beads to. How r you going to deal with cold bridges i.e. joists though the inner cavity?

Will that work as an airtight barrier?

Remember that you are using RH not AH Taking @andy's data, there will be 10g.m-3 of water in the air.

Does that mean you are going to have some extra long duct work?

I always fell dirty after reading hub sites.

No. It is to do with the mass of air that flows though the heat exhanger. A larger ASHP has a larger area heat exhanger. This allows a greater mass of air to pass though. As the energy is extracted by dropping the air temperature, less of a temperature drop is needed to extract the same amount of energy. This has the added bonus of less chance of freezing up, and less noise because of slower flows. I dislike using the fridge analogy, but if you leave your fridge door open a little bit, you may still have a lower temperature inside, but you will notice that the compressor is constantly running and there may be a lot of frosting up.

So does that mean that the membership vetting process is not working?

It was the admin being paranoid about 'spammers' I was told.

This running 24/7, setting back temperatures, or using at fixed times is all a bit confusing. My take on it is that even a system that is set for fixed temperature and run 24/7 does not actually do that. All it is doing is taking a que from the room thermostats and switching on if needed. Using a set back temperature basically just delays the switching on until the conditions are met i.e. between 8AM and 12 Noon, temperature less than 18°C. This is no different than using a thermostat with a large hysteresis. It is also what a buffer tank can do, but between the heat source and the room. There is possibly a reason to have the temperature variation within the buffer tank larger than the room thermostat hysteresis i.e. buffer temp range ± 5°C, room stat hysteresis ± 1°C. Run a lower temperature system at fixed times is alright, as long as it is powerful enough to reach the target temperature within a reasonable time i.e. 1 hour.

DHW and Space Heating are different things. They do things at different temperatures, at different times and for different reasons. Separate them. I am also concerned that people may spend a lot on capital equipment to take advantage of one energy suppliers latest tariff. Is there a guarantee that this tariff will remain in place for a decade?

The worse thing about blogs on here is that you cannot go back and edit things after half an hour, this is really a dumb idea.

Compared to newer lithium technology, yes. It is also very large. If you hope to get the full capacity out of chemical storage i.e. 1kWh storage and 1 kWh usage, then the efficiency is pretty appalling, all the components get hot, which s just throwing the energy away. This is why batteries are huge. They are , in effect, oversized. Which ever way you go being an off gridder, you will end up with a generator. Look into combined heat and power units. Then find a way to make them quieter.