KEBA Heat Distribution
Controls KEBA heat distribution units with up to 3 heating circuits via Modbus
Template for monitoring and controlling KEBA Heat Distribution units via Modbus RTU. Supports up to 3 heating circuits, boiler, and buffer storage. Reads temperatures, humidity, operating modes, and alarms while allowing setpoint and mode adjustments.
- Protocol
- Modbus RTU
- Connection
- RS485
- Registers
- 50, read and write
- Brand
- Keba
- Key readings
- Target and room temperature HC1-HC3 · Room humidity HC1-HC3 · Operating mode HC1-HC3 · Boiler 1 and buffer 1 temperatures · Outside temperature · Alarms 1-5
- Available commands
- Target and economy temperature HC1-HC3 · Operating mode HC1-HC3 · Boiler 1 target temperature and mode · Buffer 1 backup and cooling temperature
- Last updated
Registers (50)
27 read, 28 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| >Control Status | °C | Read | |||
| Target temperature heating circuit 1 | °C | Read | |||
| Room temperature heating circuit 1 | °C | Read | |||
| Room humidity heating circuit 1 | % | Read | |||
| Operating mode heating circuit 1 | Read and write | ||||
| Heating requirement heating circuit 1 | Read | ||||
| Target temperature heating circuit 2 | °C | Read | |||
| Room temperature heating circuit 2 | °C | Read | |||
| Room humidity heating circuit 2 | % | Read | |||
| Operating mode heating circuit 2 | Read and write | ||||
| Heating requirement heating circuit 2 | Read | ||||
| Target temperature heating circuit 3 | °C | Read | |||
| Room temperature heating circuit 3 | °C | Read | |||
| Room humidity heating circuit 3 | % | Read | |||
| Operating mode heating circuit 3 | Read and write | ||||
| Heating requirement heating circuit 3 | Read | ||||
| Boiler 1 temperature top | °C | Read | |||
| Boiler 1 operating mode | °C | Read and write | |||
| Puffer 1 temperature top | °C | Read | |||
| Puffer 1 temperature middle | °C | Read | |||
| Operating mode | Read and write | ||||
| Outside temperature | °C | Read | |||
| Alarm 1 | °C | Read | |||
| Alarm 2 | °C | Read | |||
| Alarm 3 | °C | Read | |||
| Alarm 4 | °C | Read | |||
| Alarm 5 | °C | Read | |||
| Write target temperature heating circuit 1 | °C | Write | |||
| Write economy temperature heating circuit 1 | °C | Write | |||
| Write cooling requirements heating circuit 1 | Write | ||||
| Write heating requirements heating circuit 1 | Write | ||||
| Write flow target temperature heating circuit 1 | °C | Write | |||
| Write offset heating circuit 1 | °C | Write | |||
| Write target temperature heating circuit 2 | °C | Write | |||
| Write economy temperature heating circuit 2 | °C | Write | |||
| Write cooling requirements heating circuit 2 | Write | ||||
| Write heating requirements heating circuit 2 | Write | ||||
| Write flow target temperature heating circuit 2 | °C | Write | |||
| Write offset heating circuit 2 | °C | Write | |||
| Write target temperature heating circuit 3 | °C | Write | |||
| Write economy temperature heating circuit 3 | °C | Write | |||
| Write cooling requirements heating circuit 3 | Write | ||||
| Write heating requirements heating circuit 3 | Write | ||||
| Write flow target temperature heating circuit 3 | °C | Write | |||
| Write offset heating circuit 3 | °C | Write | |||
| Boiler 1 write target temperature | °C | Write | |||
| Puffer 1 write backup temperature | °C | Write | |||
| Puffer 1 write cooling temperature | °C | Write | |||
| External requirements | Write | ||||
| External requirements temperature | °C | Write |
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Use cases
- Monitor room temperatures and humidity across three heating circuits on a single live dashboard.
- Adjust target and economy temperature setpoints remotely without an on-site visit.
- Create an alert when any of the five alarm registers activates on the KEBA unit.
- Track boiler and buffer storage temperatures over time to identify efficiency trends.
- Switch heating circuit operating modes remotely for seasonal or occupancy changes.
- Compare outside temperature against heating demand to verify control curve settings.
Installation
Connect the ModbusCloud Gateway to the KEBA Heat Distribution unit using a shielded RS485 cable with correct A, B, and GND wiring.
Enable Modbus RTU communication on the KEBA unit and configure the slave address according to the device manual.
Verify the correct baud rate and parity settings in the KEBA documentation, as the template default may not match the device factory setting.
Import the KEBA Heat Distribution template in the ModbusCloud platform and assign the correct Modbus slave address.
Confirm communication by checking that room temperatures and operating modes appear with plausible values on the dashboard.
Test write access by adjusting a target temperature setpoint and verifying the change on the KEBA unit display.
Things to watch for
The gateway cannot communicate with the KEBA unit after importing the template. What should I check?
The baud rate stored in the template metadata may be incorrect. Check the KEBA device manual for the actual default baud rate and parity, then update the gateway serial port settings accordingly.
Can I read and write the same register, for example the operating mode?
Yes. Several registers in this template are mapped as both readable and writable at the same Modbus address. You can read the current value and overwrite it from the ModbusCloud dashboard.
Do I need to terminate the RS485 bus?
If the KEBA unit is the last device on the RS485 bus, enable the 120 ohm termination resistor at both ends of the cable. Unterminated buses can cause intermittent communication errors, especially on longer cable runs.
How are temperature values scaled in the registers?
Refer to the KEBA Modbus register documentation for the exact scaling factor. Some KEBA devices use a factor of 10, meaning a register value of 215 represents 21.5 degrees. Confirm this before interpreting dashboard readings.
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