Takes sometime, but its worth it and looks good -
I’d imagine it helps a bit with power, as the steam will hold more heat?
With the amount of exposed steam line you have, I would say you could be losing heat.
Does it really matter? That I suppose is the question.
Here's some lines that I have lagged -
I suppose if it helped enough I got more boiler time, it would. Upon starting I get a lot of liquid water into the condenser but then it clears up pretty quick. And obviously the whistle spews out quite a bit too, until it heats up.