SteamyTea

Or a larger cupboard and put a decent amount of insulation in it. Just make sure that it is also airtight and the insulation can be easily removed for maintenance/G3 testing. And make sure any power cables are upgraded and installed correctly.

Also means we could but with cash and move house a lot easier. People fret over the number of years that a PV or ASHP will take to pay back, but once inflation is taken into account, many people are taking 40 years to buy a house, and are paying twice what they initially thought the price is. I saw an identical house to mine advertised at twice the price. Probably a chancer hoping to cash in from a paranoid Covidiot, good luck to them, but they will pay the price later though.

How would people feel, if over a decade, house prices rose at the general inflation rate? Or even better, if they had the same deflation rate that white goods and technology has had over the last 30 years.

Try boiling it in water, or oil. You can probably get a replacement. They Isaac Lords in High Wycombe. https://www.isaaclord.co.uk/product-category/ironmongery/door-furniture/ Then do a Google image search and buy it cheaper.

Make sure the paint is the right viscosity for spraying. My Chinesium sprayer came with s gauge. Still in the box as I have not got around to using it yet. Regarding mist coats, before I had my eyeballs drilled, lenses liquified and replaced with new, shiny bright acrylic, everything was misty.

Some is turned into thermal energy by the inverter, then the system may go well over limits and shut down. But I think you still need permission if you can potentially go over the 16A per phase, so the system size is based on module capacity, regardless of what your inverter/diverter does. Always ask your DNO, there is then no confusion at all and you can make a proper decision. I once made the decision to ride my motorbike, very drunk, home one night. Often people get away with this, but that night I didn't. Luckily it was the 1970s, so a 50 quid fine and a year off the road, and no real affect on my insurance. Now I would be a social outcast for bring irresponsible, but I was a teenager then. Wish I was now.

It is quite normal. All I am saying is that we can build better systems at not too much extra cost. I could probably modify ab Ecocent type system and run both my water and space heating from it. But that is because, like you, we have very low energy needs. In a larger, not so efficient, household, water heating may dominate, a system designed purely to heat just hot water may well be much more efficient i.e it would not have to modulate, could use a different refrigerant, run at higher temp with a larger radiator. The UK is only at the start of the HP journey and there is a lot of friction to overcome. Imagine asking a plumber that is used to fitting gas boilers for the last 30 years that they now have to think differently. They have all the skills, but they will struggle to overcome their old prejudices, let alone explain to a customer that they have to be left on all the time. Not mentioning any names here, but we all know the kind of customer I am talking about. 1kW for 24 hours is the same energy as 2 kW for 12 hours, except the efficiency loses are greater at elevated temperatures. (If thermal boilers were so (expletive deleted)ing great, why is CoP less than 1, when I was a kid we had a gas powered fridge in the caravan, why is there not a gas powered heat pump. I know the answer)

Because for very little extra manufacturing costs, you could get a system that is more efficient. Basically a normal HP is being asked to do two things, at different temperatures, and for different times. Combi boilers are the same. It is akin to asking a car to be small, economic, high speed and spacious. Easy to do with a 2 seater (small heat loads), just put a box on the back and call it a van, not so easy to do with a 6 seater (high heat load), they end up like the Fiat Multipla, which was rubbish at everything.

That is possibly the mean run time. It is the power distribution that is important, generally the lower power output, the higher the CoP. This is why HPs are oversized by peak power output. 70% if the time they will be running well below capacity, only a few percent at maximum, then auxillary heating may be needed. This is the same as most heating systems, except will some thermal ones, as they modulate downwards, the efficiency follows. It is all a numbers game. As always, if you can reduce the power losses, the problem becomes easier to solve. I often think two ASHPs are needed, a basic one for water heating, and a more sophisticated one for space heating. They could share a box and many of the parts inside i.e radiator and fan, electrical and electronic interfaces. Only the actual compressors and pipework need to be separate so they can run two output circuits, a high and a low temp.

I often think that if MVHR had 200mm diametre ducts, a lot more could be made if it.

Have you heard of a company called MacSalvors? They are in Pool. Always worth a call when you are stuck for stuff. And well worth a visit if you are in the area. Pool is real Cornwall, not the nice picture postcard bit.

Don't quite understand what you mean there. Are you saying putting a 6.5 kW heater in your MVHR outlets would not hear your house. Or swapping your existing thermal emitter (no idea what it is) to strategically placed electric radiators would not heat the place. Two points. MVHR has, generally, too low a mass flow rate. The key in my previous response was 'strategically placed'. You could get very different results with only one 6.5 kW heater in a small upstairs bedroom, compared to 26, 250W, heaters evenly spaced around the house.

From the same website. "Average prices shown are based on the supply of fuel volumes suitable for a medium-sized domestic property (around 16.5MWh of annual heat demand), quotes taken from suppliers within the East Midlands region" So very limited in scope. You really have to establish your own energy usage and prices. Luckily though, a kWh is a derived unit of energy, so no need to convert that bit.

Had forgotten about this, he eventually got back to me saying "too far". @magutosh Did they do all the heat load calculations and how does it compare to your SAP/EPC numbers. And how did the system sizing compare to other systems?

That is true for any heating system though. This is such a misunderstood point that it has become binary. You need to define the question better. If two matching capacity systems were fitted to two identical properties that where in the same climate regime, with the only difference being the fuel source, you may well get different operating hours, but that tells you nothing. Take E7. By its very nature it only operated up to 7 hours in any 24. Compare that to a gas system that may run for 18 hours, or 1. You have learnt nothing about efficiency, running costs or comfort levels. May as well ask how often a front door can be opened when buying one.

I was commenting on your tactic in arguing a point. You pop us as soon as people mention HPs, and tell them they are useless, then come along with a barmy solution to justify your stance. That is known as trolling. Now get a grip, read some stuff and learn.

You are deflecting from the argument, you are supporting Hydrogen, a typical troll tactic. Are you going to claim that all pipework will need to be replaces next? ASHPs cannot be used in flats, that they kill kittens and give old ladies an attach of the vapours. Keep on track, read the latest research and developments in operating modern heating systems, and the cost of equipment, it is hardly new technology, been around decades. The same people that pay for energy, us. Where do you think money comes from?

Or to turn on heat pumps, large industrial refrigeration, charge batteries, planned maintenance shutdown on other generation. You just don't understand the inefficiencies of hydrogen, it is like shutting down half your generation capacity. When a wind or solar farm is designed, there are two numbers that are used. Installed Capacity, MWp Generation Capacity, MWh. They are different, but both are known, it does not come as a surprise when night falls that PV stops generating, or that wind is variable. Because these things are known, the actual estimates are very accurate. You can, if you care to, look up the day ahead estimates and see how good they are. But you won't.

Ha Ha Ha Ha Ha Ha

You can easily look up how much energy a house uses, then calculate the size of heat pump needed. https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/946419/Sub_national_electricity_consumption_statistics_2005-2019.xlsx https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/946437/LSOA_domestic_gas_2010-19.xlsx All the information is there if you care to look. My house is 'Pre Millenium' and I use less than 2 MWh/year for heating. Are you saying that it is impossible for a house like mine to be heated by an ASHP? My last buy one house was a large, 3 story, end terrace Victorian place. The gas boiler in there was 30 kWh. You can buy a 30 kW ASHP. Or buy 2 15 kW, which means you can use jut one for DHW heating (it could even be a 20 kW and a 10 kW). You really need to keep up with the technology rather than have the 'a Morris Minor was a great car, if they made it today they would have a winner'.

With a CoP of 3 or more. So Hydrogen, created from RE, but burnt in a gas boiler will probably give you CoP of 0.3, maybe 0.4 if fed into a fuel cell. RE generation may loose 8% on the way to the end user, and a battery may loose another 15%, so a CoP of 0.77, then the HP taking 50% of the energy but working at a CoP of 3 gives you 2.31. Overall that will be a 1.54 multiplication factor.

Don't think it is, I posted up the government report on it. Here is a bit from my favourite comic. "One stumbling block any hydrogen energy revolution faces is storage and transport. Hydrogen molecules are so small they can leak out of containers, meaning pipe networks previously used for methane may have to be upgraded before they are fit for hydrogen." And that is before the inefficiencies are taken into account. It is much easier and cheaper to reinforce the local electricity grid than the gas grid. I think people have a desire for hydrogen because it is similar to what we already have, but this is missing the point completely. And if you combust hydrogen in air, you get oxide of nitrogen as well as water. Nitric acid is not nice stuff. Makes sulfuric and carbolic acid seem as mild as soap.

You keep saying this. But where is your evidence? Put the wrong size system in any house and it will perform badly. The main reason for government subsidies had little to do with the high cost of the equipment needed, if was more to boost the government at the time (Cameron's) green credentials. It has probably increased the cost of installation, why many on here have just gone out and bought the kit and fitted it. Ah, the hydrogen economy, why would you do it. As I have said before, it is like putting 10 gallons of gasoline in your car, then taking 4 out and pouring them down the nearest drain. Hydrogen will be the niche product.

@Dave Jones has a hatred for heat pumps, but will never quantify his assertions.

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