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High Volume Potable Water Heating; Cascading Unit Applications - Bosch C 1210 ES Applications Manual

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9 High Volume Potable Water Heating

Potable water
Potable water is water that is suitable for drinking. Bosch Water
Heating appliances are approved to heat potable water only. Heating
any other liquid other than potable water will void the manfucturer's
warranty covering the appliance.
This section lays out the options for high volume water heating for
large residential and light commercial applications including
continuous fl ows.
Data subject to change without notice | 01.2011
THERM Tankless Water Heater Applications Manual

9.1 Cascading unit applications

A cascading application should be considered if the potential hot
water demand exceeds the capacity of one gas tankless water
heater. The cascading set up supports variable fl ow inputs and is
designed for large homes and commercial applications. Cascading,
unlike other parallel applications, maintains the activation fl ow rate
of a single appliance.
Intelligent Cascading allows up to twenty four appliances to be
connected in parallel. One of the appliances will serve as the
controlling primary appliance and will attempt to meet the hot water
demand. If the hot water demand is beyond the capacity of the
primary appliance, a signal is sent to one or more of the secondary
appliances to ignite.
With the Intelligent Cascading, after each 100 hours of operation,
the system will automatically rotate which heater is serving as the
An Intelligent Cascading Kit (part no. 7709003962) must be
purchased and installed for each secondary appliance included in
the installation.
Example: A 7 unit cascade installation includes 1 primary appliance
and 6 secondary appliances. 6 intelligent cascading kits
must be purchased for this installation.



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