Convection oven and greenhouse: what they have in common

1. Step 1. Convection oven — has part — Thermostat. A thermostat.
2. Step 2. Thermostat — is part of — Water heater. A thermostat.
3. Step 3. Water heater — includes — Solar water heater. A solar water heater is a boiler warmed by the sun.
4. Step 4. Solar water heater — has part — Window glass. The glass on top creates a greenhouse effect.
5. Step 5. Window glass — is part of — Greenhouse. It lets light in and holds heat.

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