Vent windows and boiler: what they have in common

1. Step 1. Vent windows — is part of — Greenhouse. Venting when overheated.
2. Step 2. Greenhouse — has part — Window glass. It lets light in and holds heat.
3. Step 3. Window glass — is part of — Solar water heater. The glass on top creates a greenhouse effect.
4. Step 4. Solar water heater — uses — Heat transfer. Heating the water.
5. Step 5. Heat transfer — is used in — Combined heat and power plant. Waste heat goes to heating.
6. Step 6. Combined heat and power plant — has part — Boiler. Power boilers.

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