JohnMo

Didn't think it has been legal to DIY asbestos for the last decade, two or three, asbestos is a control substance.

As posted by yourself 15mm fine for a 2 to 3 of kW. I am also stuffing 6kW (0.96m3/h) through about 10-12m of 22mm Hep2O, but that needs the assistance of a second pump in the return line. So various ways around an issue. We all know that mentality will continue, given a magic bullet or not. That may be required the way most people seem to want a zillion zones all over the house. Sticking a gismo on a random pipe is sh**e in sh**e out. It doesn't tell you much about how the water is being distributed, is it just opening a bypass valve, funnelling through a big section of pipe and then short cutting past most the system.

Good luck - I tried and couldn't get anyone to supply anything with a decent Uw. The all quoted Ug. Basically hoping you didn't go through the numbers. If you are not careful you will end up paying for triple glazed and getting poor double glazed performance.

Your ok with 15mm in a lot of cases, I have a 2 port UFH manifold fed from the main header in 15mm Hep2O, approximately 6m each way. Zero issues with flow rate.

Not legal or sensible for you to touch it. You have to pay for it to be removed and disposed of safely.

Never heard of a DPM being required for an outdoor patio

What you need is a strap on ultrasonic flow meter. Or you could just use a look up table, like on heat geek. From the heat loss calculations you will know what each section of the heating system needs to supply in kW. Use the look up table to manipulate the flow rates and dT if required. Maybe small sections of a header will need up sizing.

I had an interesting conversation with the battery installer the other week, he was saying, one of the inverter manufacturers has a dedicated immersion output. But it looks at the state of battery charge and solar generation, and if it feels it is right, puts the whole 3kW in to the immersion for a set period, then assesses battery charge state and PV output, repeat... Good concept if you have a battery and don't want to or can't export due to you G99 restrictions

It does but I have a diverter when I am transferring a few hundred Watts to the immersion, it's questionable how much heat it's actually transfering to the water. Because unless the element surface temperature is higher than the water temp, there is no heat transfer. Think if I was doing it just for water heating I would buy a Willis heater casing, add a matched heating element (per the spreadsheet attached a few comments above) then hook up to the top and bottom of the cylinder. It would always be drawing through cold water and the hot water would go direct to top of the cylinder.

Sounds like you have half the WC system installed. So next question does your system have 2x 2 port valves or a 3 port valve - these will be near the cylinder or boiler.

Did the senso comfort get installed?

So if set to weather compensation, and you are on a system boiler, you should have two different flow temperatures from the boiler, one for cylinder and one for house heating. So on cylinder heating, a high fixed output temperature and a lower variable flow temp for the house heating. WC flow is running the boiler at the lowest output temperature to get the highest efficiency. To stop short cycling of the boiler you NEED an open system. So WC should operate as an open system, i.e rad stats should be moved to say 23 degs if your room target is 20. If the room or all rooms are getting to hot or not enough the WC curve is not adjusted correctly and will a require a tweak. Read the manual on how to make adjustments. If the odd room isn't correct but the rest are ok only the flow to that rad needs adjusting. Go on heat geek website and read up on system balancing, for what to do if this is the case.

Boiler doesn't know or need to know what occurs downstream, all it manages is temperature and delta T. So the basis of operation is. There is a target max temperature and a corresponding dT. The boiler will in a controlled manner increase flow temp in response to a change in dT. The dT being the difference in flow and return temp. The flow temp will increase to the max it is programmed to do. It then stops. Once the return temp has dropped the process starts again. Now a couple of questions for you. 1. You have an outside sensor, is your boiler set up to run weather compensation? 2. Combi or system boiler?

Slate comes in many different grades, same stuff doesn't come out the ground the same from different locations. They can also slice to different thicknesses. This affects price and life span, also some thinner slates are unsuitable for higher wind speed areas. Welsh slate can be bought (more expensive, but way better quality) should last a 100 or more years.

I was told by my roofer if I wanted him back in under 10 years to do the roof again go for Chinese. If I wanted a roof that lasted, to go Spanish Cupa heavy 3s. So that's what I did.

2020, so a while ago

Don't tiles always look a dog's dinner anyways specially when cutting around something. That's why I like slate, they are thinner and the cut edge is clean.

You could - I wouldn't - it's a bodge. GSE panels have correct drainage and ventilation, cable routing and wind load design. They stop the ingress of water, and once you get your head around the install, very simple to install. If the panel flies off in high wind gse get the blame, bodge job you do. PV panel is basically a pane of glass in a frame, if it hits from a roof, leave that to the imagination. The GSE panel is £30, fixing and trim piece cheap also. Or don't integrate, install slates or tiles and roof bars and hooks. Do it properly once.

If you go on to GSE site, there are videos showing how to install. Would doubt gse panels are suitable for standing seam

Not here this panel is £29. But all parts available separately https://www.tradesparky.com/solarsparky/mounting/gse-integration/mounting-plates-frames/gse-halfport16501135-1610-1800x1130-1135?gclid=CjwKCAjwrranBhAEEiwAzbhNtYXjvlOJ8rSRX3slCB3ccQdXHEAiGgPUjaA15HDbvyw4lMClpprwBxoCH7oQAvD_BwE

PV and immersion heaters isn't as straight forward as DC to the immersion as the impedance (think that's the right term) needs to be balanced You need to use something like the attached spreadsheet to calculate the match between panels and immersion. Or as @SteamyTea say, go AC and then diverter. Solar PV Calculator (1).xlsx

Different for hybrid or non hybrid. G98 approval allows 3.6kW export with prior approval, so you would overclock the inverter, have more kW on the panel side, because 99% of the time it will not be at nameplate rating. So 3.6kW inverter with say 4kW panels. When you get to hybrid, the kW rating also applies to how much kW you can transfer from battery to house. So here it's better for a bigger inverter. But then you also need G99 approval. Horses for courses.

We have found with UFH in the heating season, because the floor isn't sucking so much heat away, the rooms actually feel warm with the thermostat set at 19. But when the UFH cooling is on, even though the room can be 23/24 it actually feels nice and cool.

I bought my GSE trays from ITS, they were £25 each. I would double check your quantity of the sundry bits from GSE. £98 for each panel doesn't sound right. Here is my list of bits for 10 panels

You just balance, if one area is too hot decrease flow to those loops, if to cold increase flow. Adjust over a week or so. Have a wireless thermostat so you can use trial error to find the best location. Use it to control the whole zone.