Radiant floor heating

Diagram to come

Its parts

Boiler: Boilers and pressure vessels are constructed similarly. Essentially, a boiler is a pressure vessel.; City of Chicago
Mixing valve: A thermostatic mixing valve (TMV) can be used to regulate the temperature at plumbing fixtures to prevent hot water scald potential. The mixing valve will reduce the point-of-use water temperature by mixing the hot water from the water heater with a cold water supply.; ENERGY STAR
Circulator pump
Zone valve
Expansion tank

Glossary: Radiant floor heating
Its entry, and the guide's pages that use it.
Hot-water heat
How hot-water boilers and radiators work, bleeding, pressure and efficiency