JohnMo

I used Durisol, half the the house is clad in stone slips, these are attached directly with flexible outdoor tile cement, the other half is wood clad, used breather membrane, wooden battens directly screwed into the woodcrete. All pretty simple.

Really all depends on how you compare. ICF, can be put in just about any weather, block work has limitations. You can easily do it yourself, or are you paying for a squad to do it for you? You need to do a couple of concrete pours, do you have access for the concrete lorry and the concrete pump lorry and boom, depending ICF system, you may need to factor in support props for the pour. Block work you need access for a cement mixer, and somewhere to drop of blocks. Really depends on a number of factors. I did ICF and there is a post I did a while ago that details all our costs, it wasn't that expensive. But I did all the work myself with a paid guy to assist me. The walls were completed in Dec 2020 and me 4 weeks to complete, 70m perimeter by an average of just over 3m tall.

I used 10mm

Just to counter the above what about the hour or two heating the cylinder when the ASHP could be running flat out even in the summer.

Use wireless thermostats as these can be moved easily to find the ideal location

Firstly I find it bonkers how much pipe these companies specify for a well insulated house. I would increase the pipe spacing to 200mm, or even 250mm, I would have no dedicated loops in hall ways, just use the pipe going from the manifold to the room spread in the centre of the hall at 200 to 250mm centres. I would have a max of two zone, one up and one downstairs. It is unlikely your upstairs will require much heat, as it will borrow from the downstairs. Put the thermostats in the hall away from draft and the sun. Once you get the system up and running you will need to balance the flows to get the room temps where you need them. Run the whole lot on weather compensation. Your flow temps should be low enough that if the sun heats a room the UFH will stop giving out heat naturally in that area as the floor temp will only be a couple of degrees hotter than room temp.

That would be nice, I would make a £2k profit. Or at least get what I am doing free of charge.

You can register for vat at any turn over it is when you go over that threshold it is compulsory. I set up a company and the next day registered for vat, had zero turnover at that point.

Cylinders2go, will make configuration you want, I believe, so will most UK manufacturers.

Think the terminology is wrong, I think it should be fit for purpose installs, not a gold plated solution that skips everything to replace with new. So not an on the cheap install.

Why are you using acrylic primer in the first place? To prime a wall just use emulsion watered down 20 to 25%. Then emulsion over with undiluted emulsion, once dried. Job done

We have a metal frame around our window. We added a frame to the outside in wood and the windows are mounted into that. The steel frame was then wrapped in a combination of aerogel and 25mm PIR. Have attached some images, zoom in to get a close look.

Sorry not a fan Roof design looks too complex and fussy. The utility sticking out doesn't look right East and West views look like you've chopped part of the house off. Is the chimney real, mock, do you need it?

People have obviously got too much money, if that's a touch too high. Unless you specified gold plated radiators then it's ok. No wonder they are saying MCS is just tax relief for the rich. If someone came along with half that figure for a gas boiler installation they would be laughed at, but people are will to be royally screwed over for an ASHP - world has gone mad.

We went in the other day to Howdens, mentioned our neighbour name, got a 60% discount on a couple of kitchen units and 40% of a brisket join bit. The invoice was in the name of an unheard of joiner. They were almost looking for a name, almost anyone's name would do, to give us a discount.

But you really only need to do do a room calculation of heat loss for sizing emitters, a whole house will be fine for sizing the overall heat demand, such as the calculation spreadsheet on building (and work out floor, wall and roof U values) @Radian posted just before me

I just calculated the following and it gives a close estimate to the heating demand I have. 3700 (total gas usage for Jan and Feb including DHW) / 1488 (number of days x 24) x 150% Gives around 3.7kW. Which fairly close to my heat demand at -9 (which we had over a couple of weeks during the period). The realistic ASHP would be 5 to 6kW. I have chosen a 6kW one as it happens.

There are only three complications to a heat pump, that a normal plumber needs to get his around. Everything else should be normal stuff. 1. Sizing the heat pump, for a retrofit taking the energy consumption for December and or January, will give you a good place to start, just a matter of a simple calculation and possibly a loading factor to make the average more realistic and representative of peak loading. 2. Radiators, as said give two options cheap and simple install, little or no changes, or more suitable install of correctly sized rads. 3. Hot water, keep existing cylinder, if one exists, heat via existing coil, top up with immersion. Or new cylinder. Or hot water on demand electric heater. A set of guidelines in plain English for the customer to tune weather compensation, which should really mandatory, to enable during commissioning, so the heat pump always operates at the lowest temp possible.

Seems pretty normal, you are getting plenty of run time. If you look at the return temp, this is slowly increasing over the burn period. The flow temp increase is a response to the return temp increasing, the boiler is trying to manage delta T.

Our electric meter is inside next to the fuse box. Gas is outside

Gee £91 from Tradepoint - not exactly cheap for watered down emulsion

It's a known fact that if you built 1 turbine / m² over the entire Earth's landmass They would have to tiny wind turbines to fit in a m2 space. They convert wind and solar to electric, we use the electric, it gets converted to heat etc, it all goes back to environmental energy, the circle completes.

I went my own way and did 300mm. Pipe and mean flow temp determine the output W/m2 (and floor covering). The lower the W/m2 required the less the pipe centers have an effect on the mean temp required. So at 20W/m2 and 100mm centers the mean flow is 31, while at 300mm the mean flow is 33.

First cost needs to be thinned about 25% with water, next coat full strength.

I didn't want to hit UFH pipes, or have screws hanging below the bottom surface and over time scratching away the pipe. The screws would be less than 18mm long if I didn't screw to battens. Was a risk aversion based strategy