Webasto Product N.A., Inc. 18 www.techwebasto.com
GENERAL DESCRIPTION DBW 2010/2020/300 COOLANT HEATERS
2.1.20 COOLANT CIRCULATING PUMP
The externally mounted circulation pump ensures proper
coolant circulation in the vehicle and heater circuit. The
pump is activated by the control unit to operate as long
as the heater is in operation.
The heaters may be operated with circulation pump U
4810 or U 4846 for the DBW 2010 heater, the U 4814,
or U 4851 for the DBW 2020 and 300 heaters and a
school bus specific, MP coolant pump for the Scholastic
Heater™.
Figure 20: Coolant Circulating Pumps
U 4810
U 4846
U 4814
U 4851
MP School Bus Pump
(Scholastic Heater)
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