SteamyTea

I shall get the teapot ready.

Welcome. Design the roof to give you the best PV production in winter. Then lots of insulation and airtightness tapes.

Rubber should be alright, does depend on what adhesive is used. A styrene molecule (C8H8) is around 160 nm, so can easily pass though most timber boards. My polycarbonate lenses in my glasses disintegrated after a few days in my factory. Had to go back to glass lenses.

Not if the area is being coated with glass mat and polyester resin. Just the styrene fumes can cause a significant problem.

Who gets the 30 quid they are offering?

You can't have sat in on a timekeeping disciplinary with some of the people I have had to work with. They all say they are willing.

And you can get it as a Portable App, so you can take it with you. I have used Portable Apps in places I have worked. Gets around a lot of network and crap software restrictions, without involving the 12 year old that run IT systems.

There is a third, turn up to do the job.

Yes. But it is the 'marketing' part that is important. 8 years ago, no one knew about Octopus Energy, now they are becoming a religion because 'they do something different'. That has been the clever bit. In reality, once the pricing paid for some new home technology to store energy is amortised, I doubt the real unit cost is any less that my EDF quarterly billing tariff.

My feeling is it is a marketing fad.

Dr. Algorithm

I wonder what the sanction is for not complying, £100 fine?

It could be that many on here think that it is too early, and not finically viable, to be considering batteries.

Mine has been. Chefs, and chalet cleaners earn more than environmental and renewable energy graduates.

Maybe improve the insulation on the relevant pipework/valves. At a lower temperature, you get lower losses, you may find that the final 2⁰C stored in the water soon drops in temperature. You could just try playing with the temperature first, see how it responds. Ground water is starting warm up a bit now, so can confuse a bit. Shallower baths, shorter showers is the most effective way to save energy.

Have you looked into the actual heat losses of your DhW system. You may find they are quite low, so you could heat it up almost anytime.

The element may easily be at 150⁰C+, as most of the stored water will pass by it, it should sort out the bacteria. My cylinder makes quite a noise when it is heating, like a kettle.

Get a packet of marlboro, get one of your youngest kids to strike up in the bathroom, get heaf up in loft and start sniffing. If you only have teenage boys in the house, a tin of Lynx.

How about heating it up when CO2e emissions are lowest?

I thought that, but then they call me poor ol SteamyTea

Probably all the above. Our cars (the Ford ones) are capable of 113 MPH, but not for very long. My usual average speed is around 30 MPH, even though I sometimes go almost to the speed limit. By driving like I do, I avoid excess expenses (maintenance, fuel and fines) so I have built in reliability. There is also a lot of energy in water at 70°C. Each gram has 4.2J for every degree above ambient. So if skin temperature is say 35°C, and a gram of water is at 65°C when it hits your skin, that is 126J. Now a joule is defined as kg.m-2.s-2. As a gram or water is going to have a tiny surface area, say 5mm2 and cool down in say 0.5s once smeared on your arm, it is akin to being hit by a 1 kg hammer travelling at 40m.s-1. I think, it will hurt all the same. Edit: Whoops forgot the time element, so 20 m/s.

What nice roofers. https://www.gloucestershirelive.co.uk/news/regional-news/cowboy-builders-jailed-fraud-shamelessly-8355333

Safety maybe.

True. We have been using them for years, and sorting errors is a problem, cheaper than handling cash and cheques these days though. But the cost is a normal cost of running a business, like PI insurance, pension and holiday costs. If a company thinks they are going to loose sales because of the financial cost of taking a deposit on a credit card, then run away from them, they obviously don't have a clue about running a business in the 21st centaury.