A sticker on every unit, the history behind every scan

When something breaks down you want to know what was done to this unit last time, and not have to dig through a file first. That only works if the history hangs off the unit itself, not off a separate job from six months back.

You record each client's units and installations, each with its own QR sticker. Scan it on site and the maintenance history of exactly that unit opens: what was replaced, when, and by whom.

And because the work is often not at the billing address, you keep work addresses and locations separate from the administration. The boiler stays where it hangs, the invoice goes where it needs to go.