nwp500-python

Python library for Navien NWP500 Heat Pump Water Heater

A Python library for monitoring and controlling the Navien NWP500 Heat Pump Water Heater through the Navilink cloud service. This library provides comprehensive access to device status, temperature control, operation mode management, and real-time monitoring capabilities.

Documentation: https://nwp500-python.readthedocs.io/

Source Code: https://github.com/eman/nwp500-python

Features

• Monitor status (temperature, power, charge %)
• Set target water temperature
• Change operation mode
• Optional scheduling (reservations)
• Optional time-of-use settings
• Periodic high-temp cycle info
• Access detailed status fields
• Async friendly

Quick Start

Installation

Basic Installation (Library Only)

For using the library as a Python package without the CLI:

pip install nwp500-python

This installs the core library with support for API and MQTT clients. No CLI framework is required.

Installation with CLI Support

To use the command-line interface with rich formatting and colors:

pip install nwp500-python[cli]

This includes both the click CLI framework and the rich formatting library for enhanced terminal output with formatted tables, progress bars, and colored output.

Basic Usage

from nwp500 import NavienAuthClient, NavienAPIClient

# Authentication happens automatically when entering the context
async with NavienAuthClient("your_email@example.com", "your_password") as auth_client:
    # Create API client
    api_client = NavienAPIClient(auth_client=auth_client)

    # Get device data
    devices = await api_client.list_devices()
    device = devices[0] if devices else None

    if device:
        # Access status information
        status = device.status
        print(f"Water Temperature: {status.dhw_temperature}°F")
        print(f"Tank Charge: {status.dhw_charge_per}%")
        print(f"Power Consumption: {status.current_inst_power}W")

        # Set temperature
        await api_client.set_device_temperature(device, 130)

        # Change operation mode
        await api_client.set_device_mode(device, "heat_pump")

For more detailed authentication information, see the Authentication & Session Management guide.

MQTT Real-Time Monitoring

Monitor your device in real-time using MQTT:

from nwp500 import NavienAuthClient, NavienMqttClient

async with NavienAuthClient("your_email@example.com", "your_password") as auth_client:
    # Create MQTT client
    mqtt_client = NavienMqttClient(auth_client=auth_client)
    await mqtt_client.connect()

    # Subscribe to device status updates
    def on_status(status):
        print(f"Temperature: {status.dhw_temperature}°F")
        print(f"Mode: {status.operation_mode}")

    device = (await api_client.list_devices())[0]
    await mqtt_client.subscribe_device_status(device, on_status)

    # Keep the connection alive
    await mqtt_client.wait()

Command Line Interface

The library includes a command line interface for monitoring and controlling your Navien water heater.

Installation Requirement: The CLI requires the cli extra:

pip install nwp500-python[cli]

Quick Reference

# Set credentials via environment variables
export NAVIEN_EMAIL="your_email@example.com"
export NAVIEN_PASSWORD="your_password"

# Get current device status
python3 -m nwp500.cli status

# Get device information and firmware (via MQTT - DeviceFeature)
python3 -m nwp500.cli info

# Get basic device info from REST API (DeviceInfo)
python3 -m nwp500.cli device-info

# Get controller serial number
python3 -m nwp500.cli serial

# Turn device on/off
python3 -m nwp500.cli power on
python3 -m nwp500.cli power off

# Set operation mode
python3 -m nwp500.cli mode heat-pump
python3 -m nwp500.cli mode energy-saver
python3 -m nwp500.cli mode high-demand
python3 -m nwp500.cli mode electric
python3 -m nwp500.cli mode vacation
python3 -m nwp500.cli mode standby

# Set target temperature
python3 -m nwp500.cli temp 140

# Set vacation days
python3 -m nwp500.cli vacation 7

# Trigger instant hot water
python3 -m nwp500.cli hot-button

# Set recirculation pump mode (1-4)
python3 -m nwp500.cli recirc 2

# Reset air filter timer
python3 -m nwp500.cli reset-filter

# Enable water program mode
python3 -m nwp500.cli water-program

# View and update schedules
python3 -m nwp500.cli reservations get
python3 -m nwp500.cli reservations set '[{"hour": 6, "min": 0, ...}]'

# Time-of-use settings
python3 -m nwp500.cli tou get
python3 -m nwp500.cli tou set on

# Energy usage data
python3 -m nwp500.cli energy --year 2024 --months 10,11,12

# Demand response
python3 -m nwp500.cli dr enable
python3 -m nwp500.cli dr disable

# Real-time monitoring (logs to CSV)
python3 -m nwp500.cli monitor
python3 -m nwp500.cli monitor -o my_data.csv

Global Options:

• --email EMAIL: Navien account email (or use NAVIEN_EMAIL env var)
• --password PASSWORD: Navien account password (or use NAVIEN_PASSWORD env var)
• -v, --verbose: Enable debug logging
• --version: Show version and exit

Available Commands:

• status: Show current device status (temperature, mode, power)
• info: Show device information (firmware, capabilities)
• serial: Get controller serial number
• power on|off: Turn device on or off
• mode MODE: Set operation mode (heat-pump, electric, energy-saver, high-demand, vacation, standby)
• temp TEMPERATURE: Set target water temperature in °F
• vacation DAYS: Enable vacation mode for N days
• recirc MODE: Set recirculation pump (1=always, 2=button, 3=schedule, 4=temperature)
• hot-button: Trigger instant hot water
• reset-filter: Reset air filter maintenance timer
• water-program: Enable water program reservation mode
• reservations get|set: View or update schedule
• tou get|set STATE: View or configure time-of-use settings
• energy: Query historical energy usage (requires --year and --months)
• dr enable|disable: Enable or disable demand response
• monitor: Monitor device status in real-time (logs to CSV with -o option)

Device Status Fields

The library provides access to comprehensive device status information:

Temperature Sensors

• Water temperature (current and target)
• Tank upper/lower temperatures
• Ambient temperature
• Discharge, suction, and evaporator temperatures
• Inlet temperature

System Status

• Operation mode (Heat Pump, Energy Saver, High Demand, Electric, Vacation)
• Compressor status
• Heat pump and electric heater status
• Evaporator fan status
• Tank charge percentage

Power & Energy

• Current power consumption (Watts)
• Total energy capacity (Wh)
• Available energy capacity (Wh)

Diagnostics

• WiFi signal strength
• Error codes
• Fault status
• Cumulative operation time
• Flow rates

Documentation

Full docs: https://nwp500-python.readthedocs.io/

Data Models

The library includes type-safe data models with automatic unit conversions:

• DeviceStatus: Complete device status with 70+ fields
• DeviceFeature: Device capabilities, firmware versions, and configuration limits
• OperationMode: Enumeration of available operation modes
• TemperatureUnit: Celsius/Fahrenheit handling

Requirements

• Python 3.13+
• aiohttp >= 3.8.0
• pydantic >= 2.0.0
• awsiotsdk >= 1.27.0

License

This project is licensed under the MIT License.

Author

Emmanuel Levijarvi <emansl@gmail.com>

Acknowledgments

This project has been set up using PyScaffold 4.6. For details and usage information on PyScaffold see https://pyscaffold.org/.