SteamyTea

Pipes should be insulated as well. Who did this installation?

Which would also negate the whole reason for fitting batteries.

The E7 time window is what switches it on and off. So leave it on. You may be able to reduce the temperature on the thermostat. I dropped mine down to below 45°C. This reduces standing losses. There may be a secondary immersion heater in it, that is best left switched off. They are there for emergencies when all the water, heater on the night rate, has been moved (used).

You have to be careful with the manufactures HLD, they have a quirky way of calculating it. It assumes the cylinder is cold, then heated up as fast as possible, then drained of useable hot water. The losses are are calculated in that small usage window. The rest of us heat things up and use it hours later.

If done with a HP, it is almost certain that the axillary resistance element will be on at those temperatures. Though some of the CO2 HPs should be OK.

Does David Hasselhoff still excite you when he drives around in a 1982 Pontiac Grand Am. Personally I preferred Baywatch, not for the acting, or storeyline. I wonder if you can build a a kit house around some oddly sized walk on glazing.

Seems to be a battery charging off the mains, then a car charger running off the battery.

Just added in some heat losses for a thermal store.

Will be a large ASHP as well. 5000 litres raised by 15°C (35° to 50°C) is 87.5 kWh. On E7 you get 7 hours, so that will be a 12.5 kW, so realistically a 15 kW unit. You also have almost 11m2 of surface area in that size TS, so it better be very thick insulation. If you get it down to 0.15 W/m.K, then over 24 hours, with a dT of 40°C, that will be 1.5 kWh/day. But I suspect the insulation will be more like 0.5 W/m.K, so around 5 kWh/day.

May have been in 1978 when the first large scale one came onstream. Goggle Salt Caverns and compressed air. These are not a few old Calor gas bottles pumped up with a Silverline compressor, we are talking 300,000 m3 caverns compressed to 50 bar +.

Welcome. First thing to do is download the latest building regs. That shows you what you can and can't do to a certain extent. https://www.gov.uk/guidance/building-regulations-and-approved-documents-index

The manufactures are probably tied by legislation, so should still be within the condensing temperature zone, or it would make a mockery of the whole thing. No good having a boiler that only condenses when the temperatures are spot on, wind is not blowing up the exhaust and the sun in behind the yard arm.

I am not so sure about that. Compressed air storage is currently the cheapest, then pumped hydro and then batteries. Hydrogen fuel (fool) cells are one of the most expensive in £/MWh. I also think that synthetic fuels will be used in long distance transport situations i.e. trucking, aviation, shipping, military. We have a large knowledge base with combustion technology in aviation, and turbines/turbo jets are pretty efficient when it comes to kg/km. Changing from one liquid fuel to another is much easier than changing from liquid fuel to gaseous fuel. That is long time off, we have plenty of sources of kerosene. Have to be careful with that, just taking a percentage of use is very misleading, over the last year many industries have been on shorter working hours and have cut night shifts. Industry/commerce is still a large user of power.

That could be because you live in a do dungeon. Your losses are probably greater than most.

That is pretty good. Does it still condense efficiently at that low rate?

Not sure what you mean with that statement. You will have to expand on your definition of 'current situation'.

How low can the 24, 28 and 32 kW models modulate down to? Don't think that running UFH is the same as radiators. The ability to modulate down to a few kW, and still be in condensing mode, is better than switching off and on again.

@epsilonGreedy You need to research 'contract for difference', 'strike price', 'triad payments' and long term supply contracts. It is better than speculating. It is much more than a simple supply and demand market. General note. I wonder what is happening in France with there very large proportion of power coming from nuclear, and being part of the EU grid.

Don't say a lot for the member on here.

3 of us at work tonight, I am with EDF, one of the others is with Avro, and the other, Green. Told them to take pictures of their meters in the morning so there is less argument about refunds. I owe EDF money, why I have stuck to the variable with quarterly billing. I get a lot more payment flexibility.

ICF is really a concrete house, so more time if the walls start burning to get out. SIPs uses well understood OSB, and often fire resistant PUs, but I do have reservations on SIPs for other reasons (shrinkage). Do these polystyrene houses have some certification in the UK?

Two things spring to mind. Fire Safety. Could you get a mortgage on it.

In contract law (which I doubt this is), silence is not acceptance. Always worth remembering that when your builder suggests something, then just does it without your approval.

Get a cheap worktop, cut a hole in it, then fit a normal sink. (I still remember the backache I got after staying in a hostel that had a Belfast sink, they are just too low)

It is to do with energy transfer at the cell level. Normal biological mechanisms are very low energy and can only break down a limited amount of the cellular carbon. Combustion on the other hand is a high energy process and quickly breaks the carbon carbon bonds and allows oxygen to react easily. This is why gardeners compost. There is also the issue with quickly putting in a large amount of CO2 into the atmosphere in a short time (which is what we have currently been doing for 250 years). The associated temperature rise does not fall back to the previous level in the same amount of time (to do with energy levels of electrons and the associated photon release). This is why we have a legacy problem with atmosphere CO2. We need to store, for a long time, CO2 or sequestered CO2, not just assume that we can take out this years emissions, next year. A quick reality check is to count the rings in the log you are about to burn, each ring is a years growth. Then time how long that log takes to burn. If the years it takes to burn matches the number of rings, then you are part way to becomes carbon neutral. I would like to see that log.