Which type of hydronic heating system utilizes diversion (monoflow) tees?

A one-pipe hydronic heating system utilizes diversion (monoflow) tees to enable water to circulate through the system. This design allows for a single pipe to carry both supply water and return water within one loop. The monoflow tee directs a portion of the flow to individual heating units, which can be radiators or baseboards, while allowing the remainder of the flow to return back to the boiler. This configuration is efficient in simpler layouts where the system is not overly complicated and where space is limited.

In terms of system design, the one-pipe system simplifies installation and reduces the need for multiple piping runs compared to other systems. However, it is important to strategically place the monoflow tees at appropriate intervals to ensure balanced heating throughout the space. Each heating unit can thus receive the necessary flow of hot water to provide effective heating.

Other system types like the two-pipe, multi-zone, and hybrid systems typically use different strategies for water circulation and may not rely on the monoflow tees in their designs, which is why they do not apply here.