Bosch Appliances GWH 425 PN/HN4GWH 4254, GWH 260 PN/HN2 manual Hot Cold

Applications manual 25

3.2.4Bosch ProTankless gas water heater with domestic recirculation loop

The circulator should be controlled by an external aquastat, or with a timer to run only during times of expected hot water usage.

Hot

Cold

Ariston Pro GL4Ti (for pipe runs over 100ft use GL8Ti)

Bosch GWH 715 ES, Bosch GWH C 800 ES, Bosch GWH 425 HN or Bosch GWH 425 PN

Symbols

Potable water	Flow
expansion tank	check
	valve

Bronze circulator sized according to UPC standards

(Taco Bronze 007 or Grundfos 15-42B will cover most homes up to 3 bathrooms)

Pressure	Sink	Standard
relief		tub
valve		fixture

Service	Timer or	Flow direction
valves	Aquastat

Note: Cold water piping to fixtures not shown for clarity purposes.

Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.

Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.

It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved. Drawing is not to scale.

Drawing # WH2R

CN rev 06/07

Bosch Water Heating Applications manual 11.2007