CleaverBrooks WB, Owner'S Operation And Maintenance Manual

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750-136
Model WB Electric Boiler Manual 1-5
1.4 — Principles of Operation
Cleaver-Brooks boilers are designed to keep water volume as low as possible to provide close control and rapid
response to the heating needs. Close temperature control of the water is maintained by turning off or on, groups
of resistance elements. Controls in the boiler automatically select the number of heating element groups (or
steps) needed to maintain the water temperature, while supplying the system’s heat demands.
NOTE: Although circulation pumps are not supplied with these boilers, they should, however, be sized to provide a
flow rate adequate to deliver the boiler’s full output to the system, without high boiler temperature rise (100º F).
Pumps should operate continuously and, for the best control, the flow through the boiler should be constant.