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It's brass fittings on copper that drop the price to braziery. All other copper pipe, whether soldered, painted etc etc is classed as heavy/clean. We stockpile ours and wait for good prices. Generally 2 or 3 ton a time.

Has the system definitely been balanced properly?

Flow switch is easy to pop out. Last one I went to it was stuck open.

Stuck flow switch.

Heat some slippers in the microwave and put them on to walk across the floor. Feels just like UFH.

If it's that close to the boundary, how about the footings? They project further than the brickwork.

Ignore the hot water temp dial on the boiler, it doesn’t do anything. It's a generic facia. Cylinder temp should be set at 60°c. 65° max.

I know you're now sorted, but just my 2p worth. You say you checked coil wires, but did you check the coil itself?

I think some of those Inta blending valves only have a small range. Eg 20-25°C. It may not go as low as needed.

That's where I'd start.

I would imagine you mean the mixing valve or blending valve. Check the one that's not working properly is piped up the right way.

Quite agree with you Exedon. That's how we always do it. Grant say frost stat alone it the basic minimum to get some temp into the casing and would suffice for warranty purposes.

In fairness, grant don't specifically ask for the pipe stat and feed back to valve, although it's best practice and the wiring diagram shows the connections. They want at the very minimum, the permanent live to allow the frost stat to fire the boiler. The pipe stat/valve connection is more for...

New build is perfect for heat pumps in whatever form suits, there is also talk about every new build property having 3 phase electric connections to cope with this, car chargers etc. But heat pumps are not the golden egg everyone assumes. HVO will eventually take over from kerosene and there...

HVO will be the kerosene alternative.

It all looks rather tight in there and at the time you were probably grateful to get the heating back on. I've known customers who would pay the extra to move the boiler if it wouldn't fit to MI's spec and I've know customers who would say b****r it, fit it there, I'll accept responsibility...

They're not speedfit fittings, but an alternative brand, what looks like ptfe is the collar of the fitting.

Fair point, but you'd expect it would have been piped by a tradesman to suit the layout.

You never know what you'll find under a bathroom floor. Bathrooms get moved around and remodelled and it's a nice project for a competent DIY'er. All of which create ??? So unless it's a new house, you just never know.

First things first, make sure the loops are properly filled and free of air. That's UFH 101.