A Complete System
A complete heating system includes:
The room heating units.
The pipe sizes.
The water heating appliance.
The accessories.
The combustion gas vent.
A Two-Pipe Circuit
A Series Circuit
A-Supply pipe E-Piping above floor between units
B-Return pipe F-Flow control valve.
C-Circulating pump G-Air vent
D-Tee and cap (drains) H-Purge valves to flush air from loop
Small-water-content-boiler in system as a subloop to assure minimum boiler flow.
