1. A thermosiphon is " simpler " than a heat pipe. 2. Most were also equipped with thermosiphon cooling systems that used no water pumps. 3. A wick is not needed in a thermosiphon because gravity moves the liquid. 4. The term " phase change thermosiphon " is a misnomer and should be avoided. 5. The thermosiphon has been sometimes incorrectly described as a'gravity return heat pipe '. 6. The heated water moves through the machine using the " thermosiphon principle ". 7. No pumping is required as the hot water naturally rises into the tank through thermosiphon flow. 8. The cooling was by thermosiphon . ( In later decades, a ease of manufacture and service. 9. In large houses these would be placed in a basement, allowing thermosiphon circulation throughout the house. 10. The height difference between boiler and storage allowed thermosiphon circulation in this simple large bore primary circuit.
