idm-heatpump 0.2.0

Python library for communicating with IDM Navigator heat pumps via Modbus TCP. Used by the official Home Assistant integration.

IDM Heatpump API

Official Python library for communicating with IDM Navigator heat pumps (2.0, Pro, and Navigator 10) over Modbus TCP.

This package is published on PyPI as idm-heatpump and is the core dependency for the Home Assistant integration.

pip install idm-heatpump

Documentation

• GitHub Pages: https://xerolux.github.io/idm-heatpump-api/
• GitHub Wiki: https://github.com/Xerolux/idm-heatpump-api/wiki
• Project Repository: https://github.com/Xerolux/idm-heatpump-api

The docs/ directory is the single source of truth:

• GitHub Pages is deployed automatically from docs/.
• GitHub Wiki is synchronized automatically from docs/.

Supported Devices (Current Status)

Device	Firmware	Heating Circuits	Zone Modules	Status
IDM Navigator 10	NAV10_20.23+ (2025)	up to 7 (A-G)	up to 10 (6 rooms each)	Confirmed
IDM Navigator 2.0	all versions	up to 7 (A-G)	no	Confirmed
IDM Navigator Pro	all versions	up to 7 (A-G)	up to 10 (6 rooms each)	Confirmed

Note: Zone modules on current hardware (including Navigator 10) support 6 rooms per module. Older documentation sometimes mentioned 8; the library defaults to 6 for accuracy.

Requirements

• Modbus TCP must be enabled in the IDM controller (Settings → Building Management → Modbus TCP = On).
• Default port: 502
• Default slave ID: 1

New in Navigator 10 Support

The library now fully covers the official 2025 Navigator 10 Modbus TCP specification, including:

• Heat sink / plate heat exchanger sensors (flow rate in l/min at 1072 — excellent for filter monitoring)
• Power limitation registers (4108 / 4112) for demand response / peak shaving
• Complete Booster A + B (second heat generator) monitoring
• Additional source pump faults and external pump demand control
• Groundwater temperatures and more cascade bivalence points
• All zone module rooms (6 rooms per module on current hardware)

Installation

pip install idm-heatpump

Contributing

Please open an issue or pull request for bug reports, improvements, and documentation updates.