Tap and heat pump: what they have in common

1. Step 1. Tap — is part of — Plumbing. Taps.
2. Step 2. Plumbing — is used in — Shower. Plumbing.
3. Step 3. Shower — uses — Water heater. Hot water.
4. Step 4. Water heater — has part — Thermostat. A thermostat.
5. Step 5. Thermostat — is part of — Refrigerator. A thermostat.
6. Step 6. Refrigerator — works like — Heat pump. A heat pump is a refrigerator that heats the house.

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