Its not whatever I want to call it. It is called a circulator. If you were a time served tradesman you would know this.
I bet you drive a tank around peoples lofts as well.
Pretty sure that 28 street elbow is a solder ring fitting ;)
Your pipes are swearing at me with those unequal spacings :)
Is that a snot of solder on the gas meter connection? :p
Be better to put the Ashp on a plate rather than a llh @The Real Pin 5 although you need to make sure that theres atleast 20l of fluid in the flow and return from the Outdoor unit and the plate.
Multi layer composite pipe if using any crimping system like roth or maincor.
Think it was @dean7445 who had to re plumb a house with it and Im think tools were sold which needed calibrating from day one so not fit for purpose.