ProDave

Chexk you are not buying one 100mm diameter. You want the diameter to match the scaffold pole and 100mm is the depth you want to drill it.

I was more thinking the cold water could be contaminated with the hot, it would put hot water into a short section of the cold feed pipe, and if there was a drop in mains pressure could that flow back? I just have a feeling it would break some water bylaw? anyone care to comment? If I just put a tee directly on the cold in tapping and one side of the tee was the cold feed and the other side of the tee was my stratification mix feed that would only be a small risk? The cold feed in to the cylinder I am talking about comes from the pressure reducing set that came with the tank, does that include a non return valve that would stop any possibility of back flow into the house cols water system? I also have an unused hot water return port, quite high up. that would be too high for the destratification system, but I recon I could make an extra thermostat pocket out of that which would give me 3 thermostat pockets.

My point if you want to circulate the water within the cylinder to mix up the stratification, then you need to pump it from the top to the bottom for long enough for it to mix around. To do that, you would need an extra "input" tapping on the cylinder near the bottom. The only way I could do that on my cylinder would be to pump from the hot out tapping down to the cold in tapping, but I am sure that would break some water bylaw as there is a risk of contaminating the cold water with hot water, hence if I had been ordering the cylinder again, i would have specified a second separate input tapping just a little higher than the main one. The hot water circulation loop around the house, some people still do but it wastes heat, even if really well insulated pipework.

I suspect the FF might be a big part of that. About 2kWh per day for treatment plant and MVHR it soon adds up. I am guilty of leaving stuff on standby, e.g. televisions. The satellite box is on a timer so is off over night and part of the day. Yes electric oven used most days. Washing machine and tumble dryer used most days and dishwasher every other day, they are used in the daytime so solar PV should power some of that load depending on the weather. That is likely a major part of why the non heating use goes up in winter.

Our local council sports centre has showers in the changing rooms and our membership would allow me to go every day just for a shower if I wanted to. But the petrol to get there and back would be more than the cost of a shower, so no saving, and if I went on my bike, I would need another shower when I got home. But it means we don't shower at home on swimming day.

For those suffering insomnia and need something to send you to sleep, some of my figures: The readings I take each week go in columns B, C, D, K and M. The rest are calculated from those figures. The odd figures at the bottom in row 200 are the total of each of those columns for the last 12 months. It's that pesky stubborn 75kWh non heating use each week I need to work on, which goes up in winter probably because there's less PV to offset it.

Our shower heads on full tilt I measured about 11 litres per minute. So a 300L shower would take about 27 minutes. When you are only storing DHW at 48 degrees, it will not be mixing much cold water with that. The Ladies in this house seem to delight in long showers, my daughter in particular half an hour is about normal. I am convinced she just stays there until the water goes cold. And she does not understand the concept that you can run the shower at less than full water flow. 10 minutes is a long shower for me, by then I have long run out of places to wash and hair to shampoo.

So 18kWh total per day, less 5kWh other use means the ASHP is using 13kWh per day, so in round figures that is like a continuous load of 0.5kW 24 / 7 Something is not right here. It should be easy to tell when an ASHP is running, you will hear the compressor going, and the big fan on the outside unit. Do you observe the ASHP running nearly all the time? or do you notice it turn on say once an hour for a period? If you don't know that yet, then I would watch it like a hawk on your next day off and find that out. We use roughly 25kWh per WEEK heating DWH for 3, less in the summer because solar PV heats a lot of the hot water needs. Just the simple laws of physics begs the question where is all this energy going? 13kWh into an ASHP each day will be at least 26kWh of heat coming out of it. You can't lose 26kWh of heat without warming something up, so either your cylinder will get very hot, or all that heat will be going into your house into perhaps unlagged pipework?

If you are renting, refer the problem to the landlord to fix.

18kWh per day to heat DHW for 1 is astronomical. You would be better, at least as a test, to turn the ASHP off completely and just use the immersion heater. What metering do you have to be sure that is the ASHP using that much?

First do as I am and reduce your payment now in anticipation. Then have a payment holday?

There is a lot of under handed goings on in the energy industry. I had thought Octopus were a bit better than the rest but not necessarily. The amount I was paying was already £10 more per month than my usage compared to what I actually used in the last 12 months. When I went to the self service adjust your payment, I saw it was suggesting I increase it by about another £20. So I didn't use the self service function rather I emailed them with my calculations and reasoning and they accepted it, but said i could have just done it on the self service form on the website. The higher amount they suggest can be over written and you can enter a lower amount. Wasn't there something in the news about OFCOM is going to start fining companies that set the monthly rate too high.

No. My phone plugs in overnight in another room. Each side of the bed is a clock radio and a bedside light (because we have not got around to choosing fixed wall lights) they stay plugged in and the sockets are behind the cabinets. The rest of the room was more guess work. I just put several sockets along each wall, not knowing what furniture and what layout. At least 2 are now hidden but at least there are 2 available for hair dryer, hair straightener and other objects of torture a woman needs. And one near the door for the vacuum cleaner.

What data logging equipment are you using? A pencil and paper, reading 5 electricity meters and typing the numbers into a spreadsheet. Very low tech.

Slight fred drift, but something we ALL should consider: The nice Chancellor will be giving every electricity account a £400 grant paid in instalments starting in October 2022 spread over 6 months. So I have just agreed with Octopus that starting this month I am reducing my monthly payment by £40. The lower payment will still cover the lower summer use so it won't go into debt. And come October that grant paid by instalments will pay the winter additional costs. I will then review the payment again in 10 months time, which incidentally is when my fixed tariff expires so I would be reviewing it again anyway. I log my electricity usage weekly, split into total, heating usage, hot water usage and weekly PV generation. I could really bore you if you wanted me to. I jumped onto a fixed tariff in March, which as it happens is only very slightly under the present capped rate, but at least it will protect me for the coming rise expected in October. My last years usage is down month on month from the previous year. I don't think it was a particularly mild winter so I don't know why and so can't expect it to continue being lower. Last winter I did not put the heating on until November and it was off before the end of March.

You won't go far wrong with that. A few changes, we like to nail our joist hangers with twist nails in this country and I would use the taller joist hangers that wrap over the top of the joist you are hanging from.

We are allowed a 100mm ball in Scotland. the wording is "A 100mm sphere will not pass through" It's so a babies head cannot get stuck through any gap apparently.

Indeed I do. Typo corrected.

If I could have more PV (without paying silly DNO network upgrade costs) and have an energy supplier that would store all the summer PV for free for me to use in the winter it would work. There are just so many obstacles and costs put in the way of making a scheme like that work.

Our house is not "large" at 150 square metres but uses about 6MWh per year all electric (ASHP) Heating is only about 1/3 of our useage.

My solution to the running out of hat water issue (with an UVC not a sun amp) is a Stieble Eltron 10kW modulating instant water heater in the hot pipe out of the tank. It is set slightly lower than the tank temperature so normally does nothing, but if the water starts to run cool it kicks in. And given the slow re heat time with an ASHP, if someone has a shower before the tank has fully re heated, the Steible Eltron will make up the difference.

Glass is the answer, that is what we are planning.

Re the "off at night" thing. that is down to careful system design and pipe routing. I turn ours off at night for the same reason, BUT it is not the noise of the ASHP that bothers me, rather just the very gentle hum of the water circulating pump. the circulating pump is in the plant room next to our bedroom and it's noise resonates through the pipes under our bedroom. Had i anticipated this issue I could have avoided it by locating the pump elsewhere and routing the pipes a different way. The other bedrooms in the house do not suffer this issue.

Last time we discussed this did we not determine adding extra charge / discharge cycles can do nothing but harm and shorten your vehicles battery life. The analysis last time based on expected charge / discharge cycles is an EV should be able to do in the region of 200K miles before it's batteries are end of life, but it would be less if you add extra charge / discharge cycles to the batteries. This could result in "old" EV's being scrapped sooner than otherwise as when they get to a certain age, a replacement battery pack is no longer justifiable. And if / when I do buy a second hand EV (unlikely to ever be able to afford a new one) "has the car been used for V2G" will be a question to ask the owner, and value the car accordingly. I guess if you have only leased the car, and the lease terms do not prohibit V2G use you have nothing to lose?

Ours will be more like 2M depth and 4M wide.