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I didn’t want to waste space when I built my house two decades ago so I ended up with a tiny boiler room like the one @EzzyT recently overhauled
and boy are tiny spaces a challenge to work in.
I recently added a larger boiler expansion tank and replaced an iron return header.
Dinkle color-coded terminal strips and a generous use of junction boxes keep all my wiring neat and traceable. An old tablet computer consolidates outside weather reports, inside temp adjustments, viewing DHW and boiler firing logs and thermostat settings all in one place. Pipe insulation will come this summer, when things cool down. Wiring and piping scheme can be viewed here