Navien NPE-240S2 User Manual

2Contents
Contents
1. Safety Information 3
2. About the Water Heater 7
2.1 Description of the Water Heater 7
2.2 Parts of the Water Heater 7
2.3 The Front Panel 8
3. Operating the Water Heater 9
3.1 Turning the Water Heater On or Off 9
3.2 Adjusting the Water Temperature 9
3.3 Resetting the Water Heater 10
4. Maintaining the Water Heater 11
4.1 Cleaning the Water Heater 11
4.2 Draining the Water Heater 11
4.3 Flushing the Heat Exchanger 12
4.4 Cleaning the Inlet Water Filter and
Recirculation Inlet Filter 13
4.5 Cleaning the Air Intake Filter 14
4.6 Protecting the Water Heater from Freezing 15
5. Troubleshooting 16
5.1 Solving Basic Problems 16
5.2 Understanding Error Codes 17

Navien NPE-240S2 Specifications

General

Type	Tankless
Fuel Type	Natural Gas or Propane
Energy Factor	0.96
Water Connection Location	Bottom
Voltage	120 V
Water Connection Size	3/4 inch NPT
Gas Connection	3/4 inch NPT
Venting	PVC, CPVC
Warranty	15 years heat exchanger, 5 years parts
Maximum Input	199, 900 BTU/h
Flow Rate	0.5 GPM (activation)