dpmiller

Look at LBS Snowdon. Slate-looking clay tile. Great job...

...but hang on, you say it's a drainback system? Are there any valves that have erroneously been shut off that might be restricting that?

I wouldn't expect it to immediately start doing things if it's already at elevated temperatures. Change the settings and monitor it tomorrow on heat-up.

At 70c you must have a tempering valve on your tank to protect users, so why not just increase store temp to 80c or more? Is this a drainback system? How many sensors are connected? what is the setting for EM, collector limit?

my reply was aimed at @saveasteading, sorry. Have you been charged for the engineer's time, designing the plant in the wrong place?

I'm not talking about in industry or commercial development. Looking at the size of a house to size a treatment plant aint rocket science?

As @JohnMo says, Beam will flog you something in a very retail manner. Personally I went BPC for design and hardware, but acquired the main unit off Ebay and bought everything else from them. I self-installed...

why is a SE speccing something non-structural?

@nod are all the internals in your own house MF?

so given that anyone can at any time add a diverter and start making savings, how does one start- at any time- to receive payment for export with a self-installed non-MCS PV system?

that looks like a bi-metal weld that's failed, or maybe it's even just a swaged and pressed joint and a crack formed at the top of the swage?

if it's oversized a bit you can throttle both flow and pressure. Inefficient yes, but you can do it if you need to.

this. a car will charge off a 13A outside socket...

Compriband of the right height instead?

all our controls and the secondary pump come off a different supply. Even if the ASHP was to expire and need to be isolated, we can heat the whole house either by immersion or boiler stove. Indeed even during a power failure everything bar the immersion can happily run off an inverter if needs be.

why does a buffer need a PRV?

Surely the BCO is checking compliance with the Statutory Instruments and likes it if you take the easy option of using the ADs to achieve this?

I'd put money on the top weld of the housing having a crack in it

I think you need to push the drum on a little further so that the pin drops *behind* the bearing. It's only a retainer after all

depends, might need to be 100mA time delay to give sufficient discrimination

should there not have been a piece of tanking stuck down with the liquid membrane? this kinda thing https://www.sealantsandtoolsdirect.co.uk/aquaseal-wet-room-tanking-waterproof-drain-mat-aqwrsdrain?language=en-gb&currency=GBP&gclid=Cj0KCQjw98ujBhCgARIsAD7QeAjDtCOWDv1UN_Y0-iR4-zW7p74e7RzZ5rYVIP8WokopUpJvDQ0l8bcaApXPEALw_wcB

were you rodding hard enough to push a joint apart?

make sure the trailing lead is sized correctly for the load.

you understand how a water trap works, yes?

7N is actually 7.5... https://www.mannokbuild.com/aircrete-thermal-blocks/