ProDave

I wired one like that. It was on a static caravan site, but in the middle surrounded by other vans with only pedestrian access. They had to cut up and remove the old 'van and then the new one was built in situ. No way it could ever be moved without moving a lot of other 'vans first. Onto a different subject of reclaiming VAT. If you built a "caravan" as a permanent dwelling and got it assessed for council tax, the VAT reclaim will allow you to use the valuation certificate as "proof of completion" Has anyone tried that?

I would disagree with that. So my HP has just finished heating my DHW to 48 degrees, and that means the water circulating out of the heat pump is perhaps 56 degrees. The motorised valves change over and that 56 degrees water still in the pipes is now heading for the UFH. Thankfully the blending valve will take care of that and it won't just sent that very hot water down the UFH pipes. But it would without a blending valve.

They will ask the simple question, is the inverter G98? and what is it's model number.

For a tall lift, erect a "bracing tower" from the side:

1: Yes fine, If anything ledgers right on the bottom pegs can be hard to remove as not enough room to swing a hammer to knock the peg out. 2: Technically yes, I have done it, but hard to erect, you have to stand on something to reach. 2M lift can be done much easier. If you have enough metalwork, put a set of metalwork at 2M, put the planks up, then another set of metalwork at the next lift and lift the planks up. 3 Yes they do. Not only doe the transoms support the end of the planks, the ledgers stop them wandering off sideways.

I bet if @Jeremy Harris was still posting here his would be the best.

And all totally avoidable. What does not get much air time on the news is before the referendum a whole string of politicians stood up and told us we would retain a free trade agreement with the EU. IF as looks increasingly likely that does not turn out the be what we get, will people be complaining, protesting on the street about how we were lied to? if not WHY NOT?

My brain works at domestic level finances. But tell me what would be wrong with this: The Government collects tariffs at WTO rates on all that we export. Someone pays tariffs on all that we import. Is that the importer or the government? I always beliveed it was the importer? So could the government not spend some / all of what it collects on exports to give as a subsidy to importers to offset the tariffs they pay to effectively neutralise them? I must be missing something blindingly obvious that would make that not work?

All very interesting BUT it does not tell you exported power as well as imported. You could have one such monitor on your import meter and one on your export meter and make that calculation ONLY if you check the meters operation first. Not all meters behave the same. My present import meter goes to solid red when we are exporting. BUT my export meter, and the import meter in our previous house both the red lights still flash when power is going the wrong way, but the displays do not count up. They would be useless for determining direction of power flow. Arguably the best way to make your own bidirectional power meter would be using an electricity meter chip and some DIY hardware, such designs have been published for DIY solar PV dump controllers.

If you can get it at a decent price I would be inclined to do nothing straight away, re seal it, an monitor for more movement. Is it really worth completely demolishing and re building just for a small crack in a single storey annex that is not likely to make it collapse? You might dream up plans in the future for a better, more ambitions extension and then it would be worth demolishing to start again with something bigger and better. My BIL lives in a 300 year old farm house. Every summer a small crack opens between the original house and the 200 year old extension and closes again in the winter.

Cheapest I can see on ebay at the moment is £20 https://www.ebay.co.uk/itm/Brand-New-Approved-230V-Single-Phase-Electric-Solar-PV-Generation-Meter-100A/324383422000?hash=item4b86c23630:g:J6QAAOSwFn1fuQjX

Confirmation of it being a "qwality job"

42 degrees won't feel much more than "warm" The body is a poor thermometer, anything 37 degrees or less (less than body temperature) feels "cold" Usually there is a thermometer of often two on a UFH manifold, obviously an "expense too far" for this job.

Yes it does, and my own meter now alternates it's display between the consumption reading and reD standing for Reverse Energy Detected, which was a feature originally meant to detect anyone trying to wind back the meter, but a feature that does not sit well with solar PV generation. Edit to say, the meter at our last house still flashed the red light even when exporting though the export did not count up on the display.

On a good day you will see the peak 5.2kW at mid day. I have a nominal 4kWp split E/W and I definitely see the inverter limit of 3.68kW on a sunny day. You need to first ask your DNO. This seems to be a lottery, SSE for instance wanted to charge me money to do a survey before they would even tell me how much I was allowed but I got the distinct impression they were going to want to upgrade the network for anything more than 3.68kW Up to 3.68kW output you can install without prior permission and notify afterwards. If going that route you need to get an inverter with limited output but you will need to confirm that it can handle that many panels, it might fail on over voltage for instance.

I assume you have some form of solar PV diverter to automatically send surplus PV generation to your immersion heater? That is pretty much a "must have" to ensure maximum self usage. Roughly 1/3 of what we generate ends up in the immersion heater and would be "wasted" otherwise. Next thing is run the big appliances in the daytime close to mid day, one appliance at a time, here I am talking Washing machine, tumble dryer and dishwasher. I have the timings on my ASHP to only start DHW heating late morning on the basis that is more likely to self use solar PV generation rather than start the DHW heating very early. As to how to measure it. In theory a smart meter can do that, but they don't seem to present that information to the user. What I did was install my own export meter. This us just another electricity meter just like the generation meter you have, but you wire it after the suppliers electricity meter and wire it "backwards" Here is mine: This will show what has been exported. In an ideal world it would stay at 0 meaning you have self used everything. Mine is currently up to about 240kWh over 2 years. Most of that is on a really sunny day when nothing is on to self use and the PV generates more than the immersion heater can consume (3.68kW generation, 2.8kW immersion) If I was eligible for the new export payment, at about 5p per kWh I would have earned about £12 in 2 years. You can see why I think it would have been a waste to pay for an MCS install just so I could qualify for that tiny payment. I take weekly meter readings of total import, total export, PV generation, and I also have metering that measures ASHP consumption for heating and DHW separately. They all get plugged into a spreadsheet so I can see heating, DHW and "other stuff" usage for the week. If you want a similar export meter setup, just buy another generation meter, usually available cheap on ebay, and any competent electrician should be able to fit it. Probably worth labelling it as I have done to avoid any confusion.

Our extractors all had the backdraught flaps. They just clattered and banged annoyingly when it was windy. I agree changing the fans for those with an iris would have helped a lot.

A lot of what I would call sub standard UFH setups seem to be popping up here. This is another one that is missing a temperature blending valve so the HW flowing through the pipes is at whatever temperature the boiler or other heat source provides with no means to adjust it. Can you feel heat in the pipes? Where is it fed from is there some temperature control upstream?

I ask the simple question. How will I personally benefit from a smart meter. Every time I have asked that question the answer has been I won't. So I say no to a smart meter. That might be different if you WANT a tariff that charges variable rates throughout the day (and can work around the silly high afternoon / early evening price) in which case you might have a valid reason for wanting one.

The thing with mvhr is you get constant fresh air all the time at a controlled rate which you can adjust. Trickle vents and bathroom, / kitchen extractors are just uncontrolled holes in the house fabric and on a windy day will likely grossly over ventilate the house and of course with no heat recovery. At our last house we had 3 bathroom extractors, utility extractor, kitchen extractor, stove flue (stove drew it's air from the room) A vent in the floor behind the stove to let air in for the stove to burn, a letterbox in the front door and a cat flap. It was clear on a windy day that the house was very much harder to heat, and if you opened a door or a window a gale blew through the house with all these holes in it. By comparison the new house has no holes like that, it is all sealed up, the stove has it's combustion air ducted in and not from the room, no letterbox and no cat flap. Open a door here on a windy day and no gale blows through, and the house is no harder to heat on a windy day to a still day.

Yes that's just space heating. DHW is on top of that. I don't see the point of relating DHW useage to square metres. That is a function of how many people not how big and well insulated the house is. And just to clarify this is not energy usage for "stuff" either. The non heating and non DHW electricity used here is roughly double heating + DHW. So if all my heating and DHW dropped to zero, the electricity bill would go down by about 1/3 This compares to our previous house where our electricity usage was about the same as our total here but in addition at the old house we were spending over £1000 on oil every year.

Yes I specifically installed another electricity meter to measure what we use for heating. This shows "other stuff" in the house uses at least twice as much as heating the house. PV generation exceeds heating usage, but does not quite cover heating and DHW

Mine comes out at 1648kWh for the year, that's not any estimate, that's the current real world measured electricity usage. It's about 150 square metres so 11kWh per square metre. That's the electricity driving an ASHP so in terms oh heat input assuming a COP of 3 that would be 33kWh of heat per square metre per year. I hope that figure will drop when we finally get the sun room complete as I hope that will be able to add some solar heat into the house on a sunny day. Solar PV generation exceeds that amount.

What is the breakdown between window price and fitting price?

I saw one just last week where when you opened the top drawer, it was in fact two narrow drawers with a gap in between for the basin trap to hang down into.