SteamyTea

Yes, but at nearly a third of the price at night, and with my usage pattern, still better. The reason I started monitoring was to work out if I would be better off with a fixed tariff. By better quality appliances. My washing machine does not disturb my sleep, and my house is tiny, washer is only 9 metres from my bed, and I have all the internal doors open at night. We are probably going to be forced down the ToU route, especially after today's announcement about penalising energy producers for rigging there production capacity to fit in with higher demand pricing. https://www.energylivenews.com/2023/08/31/ofgem-cracks-down-on-winter-energy-price-manipulation/

That came from my analysis of @DamonHD's data from a class room (literally just finished reading one of his dad's books). It was pretty detailed as it took weather and traffic into consideration. There is a lot of false facts about CO2 and the affects it has on people. We can tolerate what seems quite high levels with no ill affects and often no noticeable affects. So, in my opinion, RH is perfectly good for ventilation control. It would be useful to add a couple of particulate sensors, then you could reduce infiltration rates when they are high outside, or purge the building when high inside.

Normal Sunday to visit my mother. I hardly ever use my large one and am actually thinking of selling it. I find an angle grinder the second most useful tool, use it for all sorts of things. Door sticks, grind the edge, screws to long, grind them off, car headlights failed MOT, polish them with a bonnet on the angle grinder, floor boards not laying level, sanding disk on an angle grinder, welding up rusty metal, angle grinder with a sanding disk again, metal curtain rails too long, angle grinder and a diamond disk, lost key on bosses shed, angle grinder sorts it in seconds. I have recently bought a multitool, that is pretty good as well.

As we are approaching the heating seasons after one of the most miserable Augusts in recent years, and spurred on by a few comments about when it is best to run a heat pump i.e. night time on the cheap, day time on the not so cheap, I thought I would have a look at my energy and temperature data for last January and February. These are two months when I know my heating is always on as if the mean outside air temperature goes above 9°C, I can turn my heating off, and that usually happens sometime in March down here. I also do not have a heat pump, but that does not make any difference to the house heat load, it just changes the magnitude of what is used. I am though, on Economy 7, which I have modified to Economy 4, even though I usually have all my usage in a 3 hour period from 3 AM to 6 PM, with the occasional on/off for the final hour as the DHW cylinder settles out. Being all electric means that it is very easy to monitor what is happening and when, which I do at the 1 Wh level. This first chart is to just give some context as to the house and outside air temperature. It is not greatly transferable as different houses will be at different temperatures, and local weather, mainly sunshine hours, can make a big difference. But it is useful as it shows the variations in temperatures over the period monitored. It is worth remembering that I have averaged the many thousands of readings down to hourly readings, and the mean, min and max temperatures shown on the chart are taken from the time period analysis rather than the base data, so the real minimum will be a little lower, and the maximum a little higher, but over an hour, they will be right. This next chart, to me, is much more interesting as it shows how often things happen and the magnitude of the events. Really cold times, -3°C and up to 0°C only happened for a total of 24 hours (1.7% of the time). These where probably the two frosty mornings I had (Cornwall is mild, but I am at 200 m altitude and 4.1 kM from the sea). So these times are rare events. Even 0°C up to 5°C is only 470 hours out of the 1410 hours (33%) of the period monitored. The bulk of the time is therefore 5°C and over, 916 hours (65%). Looking at the mean energy usage during those times, -3°C up to 0°C my house used 64.3 kWh, 0°C up to 5°C was 452 kWh and above that 491 kWh. The total for the period was 1008 kWh. Taking the temperatures below 5°C, 35% of the time, the energy usage was 517 kWh, near enough half of the total energy used. The very extreme low temperature though of -3°, only lasted 2 hours and used 0.1 kWh. I am not sure, without looking at the two 'heaviest' times when the OAT is 1°C and 2°C why the usage is disproportionately higher. The most likely reason was that I was away 'up country' just before and this is the house and DHW reheating (I turn the water off and the heating right down when away for more than a night). I think it does show that there may be some merit in using an ASHP during the day if you can store the energy in water or a concrete slab. This will depend on what the price difference between time of use tariffs and a standard tariff is. I currently pay 40.86p/kWh for day rate and 15.05p/kWh night rate before VAT. 7% of my usage was during the day (68 kWh for Jan and Feb), that works out at £28. Pretty low for two winter months.

On one my houses had a external soil pipe. It froze up one winter.

Dump it in a quiet country lane, then inform the council that someone has fly tipped some asbestos. The council will then come along and arrange for it to be disposed of correctly. It will get paid for by increasing car park charges and closing public lavatories. Well that is what happens down here.

I worked this out once when our old mate Jeremy Harris was building his own diverter. Your point is the very point I raised. While it may be possible to not export a Wh, that does not heat up much titanium or Inconel. Titanium 520 kJ/kg.K and 22 W/m.K Inconel 460 kJ/kg.K and 6.5 W/m.K A Wh is 3.6 kJ So Titanium 0.007 K/kg Inconel 0.008 K/kg Now I have no idea how much metal is covering an element, 0.05 kg (50 g) maybe. So a rise in temperature of about 0.15 K. And that does not include the actual element or the insulation. (I think, I have a headache, one of those ones that is so bad I somehow jumped a red light earlier)

I found a fourth one. Way too much choice.

Not going to be any meaningful sun till may either. Have you added extra insulation to your DHW cylinder? Have you reduced the flow for showers? Have you reduced the cylinder temperature to as low as you can get away with? Those 3 could save you a bit.

Seems a lot. I have cut many meters of stone and slate with a single disk. I have used both and never noticed any difference. Did you check that it is really 10mm thick and that is not one of the spindle sizes?

Probably giving tax advice backstage. Don't stand to close to me with that giggle stick.

In Knotty Ash

Hard to tell, but looks like it had a knot in it, and a knot in tension. Or, a knot, not in compression.

That does rather make it a one trick pony though. If you have it grid tied, you can use excess production elsewhere in your house, and pay be paid a few quid for any exports (all rather depends how Octopus get on).

I don't know the model of boiler you have but suspect that it senses both the flow and return temperatures, if there is not much difference, then it shuts down. It may also do this on flow pressure, which probably increases. Is your boiler actually giving you problems?

That is when the first man with a shovel stops tunneling.

Civilisation comes to Bristol. All the poncy hipsters must have moved out.

You (expletive deleted)ing what. Bash Bash Bash

Going back to my 1970s SMP mathematics lessons, and the topic title question. 3PM

Don't ridge vents take care of that on a new roof?

Or

Over the rest of this decade. So 15k a year. That will sort out the housing crisis. Gove was on PM claiming that if all the measures proposed are enacted, then the rivers will have less nutrients in them. Also blamed the EU legacy legislation for the mess. But it is OK, we are delaying food tariffs from the EU, while our exports get charged it. I am so grateful that others voted for me to have my sovereignty back. Even if the sovereign has changed, which I did not vote for either. What a (expletive deleted) up of a government.

If it is Coldplay, end track.

I am looking forward to this saga. Any heating system is doomed to failure in this house.