the end-point is adjustable, to set what depth the nail head stops at, but the power (the dose of gas) is fixed on the 350, not sure about the latest one.
Was this particular AroTHERM split or monobloc? Anything with an indoor Hydrobox is going to take more space, and some units may be less reliant on a buffer tank, depending on your particular system design, temperatures, and volume.
He's having a laugh. He looks like he's comparing to one of them rotary jobbies with the motor in the sh*te, but even at that...
Air blower units only use about 50W, and the blower often doesn't run 24/7
surely in the grand scheme of things the design and commissioning of some ductwork (and the VAT on it) is an almost-irrelevant cost? And you could commission it yourself if you wanted to, as well...
Glaze is pretty smooth, the thickness may vary with quality. But a wipe of a good car polish inside the bowl will make even shiny glaze shinier and stop things from sticking