SteamyTea

Does seem that control systems are the main problem, for both installers and users. Maybe a new thread to discus the best way to design a control system is needed. I was chatting to a plumber last night, asked if he did HPs, said he was going to avoid them for the time being. I mentioned that many customers will need education as they are not used like gas boilers i.e. whack in 25 kW for a few minutes, then switch off (even though a well buffered and modulating system should not run like this). He said ''good luck with that". So is the real problem an educational one?

Enough party members voted for Truss, so Trump is unneeded as the Truss legacy is still carrying on.

Really. So recent US events concerning women's fertility don't bother you at all?

I have done jury service. If you want to see ignorance of the law, unbridled hatred of certain groups of people, having to put up with the workshy who prefer being in a clean and cosy courthouse as they get paid the same as working in the cold meat processing factory, a self elected jury foreman that had egotistical and bullying tendencies. And one bloke that had an IQ if probably 75. Plus half of the jury doing private research i.e. googling and discussing with 'outsiders'. Swapping evidence, as presented in court for opinion, scenarios and by bigotry was normal. Then, all but two of us, totally ignored the judges guidance, and found the person guilty. The guidance was that the the witnesses had been made to lie by the plaintiff, and the plaintiff was unreliable. Even the police said the plaintiff was a fantasist and had accused many people in the past. Jury trails, no (expletive deleted)ing way, it is as corrupt as the target driven CPS. 30 years since Steven Lawrence for murdered. The spotlight is on the MET, not on the thugs that did the crime. 30 (expletive deleted)ing years, half my life. Only 2 or the 5 suspected of the murder got locked up.

Except as resent events has shown, sending a few emails is considered good enough for customer contact, then the forcibly fit a smart meter, then remotely disconnect the customer. Hopefully that policy has now changed.

They are probably only going to pick the very easiest installs, the ones that could be done by almost anyone.

TL;DR This may have been answered, but shall say it anyway. The reason that heat pumps are being promoted is that they are mature technology. The reason that heat pumps are going to be fitted is because they can reduce, quite significantly, our domestic CO2 emissions. The rate of fitting HPs will go hand in hand with renewable electrical generation. Global emissions from electrical generation may well peak this year. https://www.newscientist.com/article/2368526-emissions-from-global-electricity-generation-may-have-now-peaked/ I think most high temperature HPs use supplementary resistance heating for the final 10°C or so, so not really high temperature at all. It has been a long day, but I try not to smoke too much hopium or unobtainium.

That is good, won't affect PV generation.

Why I like to monitor my own usage locally, and keep it to myself (except what I share on here). https://forum.buildhub.org.uk/blogs/entry/946-the-energy-meter-experiment/

Do they make that 50 quid you get for introducing a friend by misreading the meters? I suspect the Pareto rule applies, 20% of customers have 80% of the problems.

Not for me, meant school was out and I did not have to kill time in Witney.

There is also a difference in OAT depending on how near the coast you are. It is a very rare event if the temperature drops to 0⁰C down here, and even rarer it goes above 24⁰C. That is for the warmest region in the UK. Go to Central England, below freezing, is not unusual, above 26⁰C happens fairly often I am told. So allowing for natural ventilation will depend on the likelihood of high OAT, sun angles, time if year and duration of the above events happening. Bloody horrible down here at the moment.

idiōtēs Greek for ones own.

Here I am

Seems to be the same, almost.

Because the AH is different. 3.164g/m3 at 75 RH and -2⁰C compared to 4.403g/m3 at 94 RH and 0.5⁰C. So 72‰ more actual water to condense and freeze.

Do you have a link to the regional prices. Be interesting to see what they are charging in one of the poorest places in the UK.

It is easy enough to could the LED pulses on the generation meter, then set a limit that you divert at. But where are you going to divert to if you do not have thermal or chemical storage?

Almost. I think it is down to who the Health and Safety Executive deem to be competent, and they currently only accept it is Gas Safe registered fitters.

Thanks, I had gone to bed.

Oh yes. Yesterday I went to St. Ives. Dog shit covered streets, never seen it quite as bad. Still, the next spring tide will wash it onto the beach, will be indistinguishable from the human shit.

Not as expensive as running UFH at 100 W.m-2. There was a tale about a dancing chicken that did the rounds at freak shows. A Victorian entertainer was so impressed that he bought the chicken and cage it came in. The cage was a fancy affair, deep base, gilt on the bars and a red ruby on the top. The entertainer took it along with his travelling freak show. After a week though, he was getting concerned as the chicken just seemed to love dancing all the time. After 10 days the entertainer decided to track down the fellow that sold it to him and seek his advice on how to stop the chicken dancing. "Blow the candle in the base out" was the reply.

It is an acrylic. PLASTIC & RESIN ASSOCIATIONS WPC EPDA MAPP ARPM BACK PLASTIC INDEX Polymethacrylates Methacrylic Adhesives Methacrylate Monomers COMPANIES ACRYLIC PRODUCTS ENGINEERING RESINS RESIN DISTRIBUTORS ADHESIVES & TAPES PAINTS & COATINGS POLYMETHACRYLATES (PMMA, PLEXIGLAS) PROPERTIES AND APPLICATIONS Polymethyl methacrylate (PMMA), also known as acrylic or plexiglas, is a high volume amorphous, transparent and colorless commodity thermoplastic that can be easily processed and converted into many finished and semi-finished products. Most commercial grades of PMMA are polymerized by free radical polymerization, yielding atactic polymers whereas anionic polymerization yields syndiotactic or isotactic polymers. Most commercial grades of PMMA, however, are atactic with a glass transition temperature of 398 K (125 °C). Commercial PMMA is often copolymerized with comonomers other than methyl methacrylate. The Tg of these products can vary, ranging broadly from approximately 360 K to 430 K (87 to 157 °C). PMMA is known for its stiffness, hardness and excellent weatherability. Unmodified PMMA, however, is rather brittle and has low impact strength and fatigue resistance. To increase its toughness, it is often modified with core-shell rubber or other impact modifers. These resins offer seven to 10 times the impact resistance of standard PMMA while maintaining high transparency.1 Because of its high transparency (92% transmission) PMMA can be used as a lightweight and shatter-resistant replacement for regular glass. It has sufficient impact resistance to be machined and is often an economical alternative to polycarbonate (PC) when very high toughness and impact strength is not required. It comes in a variety of forms such as sheets, rods, and tubes, and is used for signs, optical fibers, architectural structures, tail lights for cars, bathtubs and sanitary fixtures, to name only a few applications. Many other methacrylic monomers are commercially available. They are either copolymerized with methyl methacrylate to improve its properties or are added to many other resin systems to make a wide range of polymer-based products like binders in paints, coatings, toners, inks, and water-soluble polymers.

That is quite a bit of power to pump the water around with. Does it cycle a lot? One would not fit a 3kW water pump.