LAARS Stor - Installation, Operation and Maintenance Instructions - Manual (Page 23)

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Water Connections continued-
Figure 2 - Water Boiler Piping with Zone Valves
2. For a space heating system that utilizes CIRCULATORS, refer to
Figure 3. The indirect-fired water heater connection labeled
“FROM BOILER SUPPLY” should be piped to the boiler supply
piping. Mount the circulator making sure the flow arrow points
toward the water heater. The use of shut-off valves and unions are
recommended for future service convenience. The use of an air
separator and vent is recommended to eliminate air in the system.
Pipe and fittings between the boiler and indirect-fired water heater
must be ¾” diameter or larger.
Figure 3 - Water Boiler Piping with Circulators