What is a characteristic of a gravity heating distribution system?

A gravity heating distribution system primarily relies on natural convection to facilitate the movement of warm air. This system does not require any mechanical components like fans or pumps, which is what distinguishes it from other heating systems. The principle of natural convection involves the warm air rising as it heats up and cooler air descending to take its place, creating a flow without the need for electrical power or mechanical assistance. This method can be efficient in terms of energy usage, as it capitalizes on the natural physics of heat transfer.

In contrast, systems that require electricity or utilize pumps and blowers do not fit this description. They rely on mechanical means to circulate air or water, which is not a characteristic of gravity heating.