When you look at the big picture of hydronic heating on a worldwide basis, one of the most evident trends is migration toward low-temperature distribution systems.
This article shows how to apply the analytical concept of hydraulic resistance to analyze the hydraulic and thermal performance of systems using "diverter tees."
Although hydronic radiant floor heating can be incorporated into many types of buildings, it's often a "perfect match" for garage-type buildings with bare concrete slab-on-grade floors.
John Siegenthaler's been designing hydronic heating systems for 25 years, and he still comes across little nuances that when ignored can bring a system that is 99.9% correctly designed and installed to a virtual standstill.