Danfoss ECL Comfort 210 electronic controller (2 circuits, LCD, Modbus, A-key programmable)
- Number of circuits: 2 (heating and/or DHW)
- Display: LCD dot-matrix with backlight
- Power supply + IP: 230 V AC (207–244 V), 50 Hz, 5 W / IP 41
- Communication: ECL 485 bus + Modbus RTU (not galvanically isolated)
Where ECL Comfort 210 is used
This controller is the standard choice for substations in multi-family buildings, small commercial premises, schools, boiler rooms — where separate control of heating supply (weather-compensated) AND domestic hot water is required. The program is written via the connected ECL Application Key (e.g. A266 — heating + DHW); the same physical device works in dozens of configurations.
Modbus RTU communication allows integration into a building management system (BMS) or remote monitoring platforms (e.g. Danfoss ECL Portal), while the ECL 485 bus connects several ECL controllers into a single network.
Technical specifications
| Parameter | Value |
|---|---|
| Code | 087H3020 |
| Series | Danfoss ECL Comfort 210 |
| Number of circuits | 2 (heating and/or DHW) |
| Display | LCD dot-matrix, backlit |
| Program management | ECL Application Key (A-key), 3 comfort periods per day |
| Power supply | 230 V AC (207–244 V), 50 Hz |
| Power consumption | 5 W |
| Sensor inputs | 8 (PT1000, configurable) |
| Digital inputs | 2 |
| Relay outputs | 4 (for pumps) |
| 3-point valve control outputs | 2 (for motorised valves) |
| Communication | ECL 485 + Modbus RTU (not galvanically isolated) |
| IP class | IP 41 |
| Ambient temp. (operating) | 0–55 °C |
| Storage temp. | −40 to +70 °C |
| Max humidity | 65 % RH |
| Weight (net) | ~0.44 kg |
When to choose ECL Comfort 210
- Standard substation: 1 heating circuit (radiators or underfloor) + DHW
- Boiler room with 2 heating groups (e.g. radiators + underfloor)
- When Modbus RTU integration into BMS/remote monitoring is required
- When the application scheme may change over the device's lifecycle (reprogrammable by swapping the A-key)
- Compatibility: sensors — Danfoss ESMT (outdoor), ESM-10 (room), ESM-11 (surface), ESMU (immersion) — all PT1000; valve actuators — Danfoss AMV / AME series (3-point or 0–10 V control)
B2B delivery and logistics via Amegata.lt
- 24-hour delivery across Lithuania (from our warehouse in Vilnius)
- Competitive B2B pricing — often below market average
- 30-day payment terms for companies (per contract)
- Free technical consultation on A-key selection and application scheme
Official Danfoss catalogue: store.danfoss.com/ECL Comfort 210
Frequently asked questions
Can ECL 210 control 3 circuits?
No. ECL 210 physically has 2-circuit hardware. If 3 circuits are needed (e.g. radiators + underfloor + DHW), choose ECL 310 (087H3040) with an A368 or A377 key.
Do I need to buy the application key separately?
Yes. 087H3020 is the controller only — it will not operate without an A-key. For a complete kit with key and sensors, choose 087H3104 (ECL 210 kit with A266 key).
What's the difference between ECL 210 and ECL 296?
ECL 296 has the same functionality as ECL 210 plus M-Bus communication (for heat meter reading). If M-Bus is not needed — ECL 210 is the more economical choice.
How to back up settings?
ECL 210 supports settings copy via the ECL Application Key — all parameters can be transferred to a new controller by inserting the same key. Additionally, Danfoss ECL Portal allows cloud backup when the controller is connected via Modbus.
Can non-Danfoss sensors be used?
Formally, any Class A PT1000 sensor (1000 Ω @ 0 °C, EN 60751) is compatible. In practice, we recommend Danfoss ESM/ESMT/ESMU — verified compatibility with ECL algorithms, cable length and time constants.
