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Applications manual
Application manual | 11.2007
Bosch Water Heating
4.2 Cascading unit applications
A cascading application should be considered if the potential hot
water demand exceeds the capacity of one GWH 715 ES or
GWH C 800 ES. The cascading set up supports variable fl ow inputs
and is designed for large homes and commercial applications.
4.2.1 GWH 715 ES and GWH C 800 ES cascading
Cascading allows up to two appliances to be connected in parallel.
One of the appliances will serve as the controlling Master appliance
and will attempt to meet the hot water demand. If the hot water
demand is beyond the capacity of the Master appliance, a signal is
sent to the Slave appliance to begin operation.
Symbols
Service
valves
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 # CA1
CN revA 10/07
Bosch GWH 715 ES or
Bosch GWH C 800 ES
• The plumbing must be connected in the reverse
return method with a minimum number of elbows
to aid in balancing pressures between the two
appliances.
• If a domestic recirculation system is desired,
recirculate the water through the Ariston ProTi
water heater as seen in chapter 3.4.
• Locate appliances close together for
improved performance.
• Follow industry plumbing practices when installing
multiple appliances
• Minimum pipe diameter: ¾"
• Minimum water pressure: 50 psi
• Maximum distance between appliances: 36"
• Insulate pipes to prevent heat loss.
cold
hot
hot
hot
cold
cold
inlet
outlet
Pressure
relief
valve
Ariston Pro GL8Ti
recommended
Flow direction
tankless link
Tankless
link
Water
hammer
arrestor