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How The Powerstar Works - Bosch PowerStar AE125 Handbook

Bosch water heater handbook for powerstar ae115, ae125
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5.00
4.50
4.00
3.50
3.00
2.50
2.00
1.50
1.00
95
100
For example:
For the AE115 unit, using a ball valve, ensure the flow rate does not exceed 2.3 US gallons / minute.
For the AE125 unit, using a ball valve, ensure the flow rate does not exceed 3.5 US gallons / minute.
Note: These figures are based on an inlet water temperature of 55°F and a supply volt age of 240
volts. If the inlet water temperature is lower than 55°F, or if the supply voltage is less than 240 volts,
then the outlet temperature will be lower than what is shown in Graph 1. If a higher outlet water
temperature is desired, then reduce the flow rate and/or supply the unit with 240 volts.
IMPORTANT
Before leaving the site, the installer should demonstrate the unit to the user and give them this guide.

How the PowerStar works

The PowerStar heats water instantaneously as it flows through t he heater modules.
The electronic control monitors the flow rate and the incoming water temperature and then switches
on the required number of heater modules to reach the temperature set by the adjustment dial.
As the flow rate or the incoming water tem perature changes, the electronics adjust the number of
heater modules used so that the outlet temperature is maintained.
The outlet water temperature can change slightly as the flow rate changes due to the steps in power
as different heater modules are switched on and off.
8
Outlet Temperature vs Maximum Flow Rate Setting
(based on incoming water temperature of 55°F)
AE115 Heater
105
110
Outlet Temperature (°F)
Graph 1
AE125 Heater
115
120
125
130
135

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This manual is also suitable for:

Powerstar ae115