If you think of a central heating system for a home that doesn’t use any ducts, you might first think of a hydronic boiler system. It’s true that boilers don’t need any ductwork because they send heat into rooms by circulating hot water into terminal points, such as radiators. These objects radiate heat off in waves directly into the rooms.
But unless a home was constructed to work from a boiler system originally, using a boiler isn’t an option for a new heating installation or replacement—not unless the home undergoes extensive restoration. What we mean when we talk about “ductless heating” is a ductless mini split heat pump, a forced-air system that is able to provide multiple rooms with heated air, but doesn’t need a ventilation system to transport the air.