Robot vacuum and boiler: what they have in common

1. Step 1. Robot vacuum — evolved from — Vacuum cleaner. An autonomous vacuum cleaner.
2. Step 2. Vacuum cleaner — has part — Impeller. An impeller creates the suction.
3. Step 3. Impeller — is part of — Centrifugal pump. The impeller accelerates the liquid.
4. Step 4. Centrifugal pump — is part of — Central heating. A circulation pump.
5. Step 5. Central heating — has part — Boiler. A boiler.

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