Buderus GB172i.2-40 Wall-Hung Condensing Boiler
The Buderus GB172i.2-40 is the no. 2 by size model of the GB172i.2 series. It delivers 40.0 kW nominal heat output at 50/30 °C and 39.8 kW at 80/60 °C.
Capacity table
Nominal heat output
40.0 kW 50/30 °C
39.8 kW 80/60 °C
Values are the nominal heat outputs given in the manufacturer's price list (at 50/30 °C and 80/60 °C water temperatures).
Unit conversions
| kW | kcal/h | BTU/h | |
|---|---|---|---|
| Nominal heat output (50/30 °C) | 40.00 | 34,394 | 136,486 |
| Nominal heat output (80/60 °C) | 39.80 | 34,222 | 135,803 |
Specifications
- Brand
- Buderus
- Series
- GB172i.2
- SAP no.
- 7736902503
- Type
- Wall-hung condensing boiler
- Fuel
- Natural gas (LPG with conversion kit)
- Operating pressure
- 3 bar
- Models
- 3 models (35 – 45)
All models in the GB172i.2 series
| Model | SAP no. | Nominal heat output (kW) | |
|---|---|---|---|
| 50/30 °C | 80/60 °C | ||
| GB172i.2-35 | 7736902452 | 35.0 | 33.6 |
| GB172i.2-40this model | 7736902503 | 40.0 | 39.8 |
| GB172i.2-45 | 7736902504 | 45.0 | 42.6 |
Data date: 2026-09-21.
Similar models
Compatible accessories
7738114123RC310 controller, black (FA outdoor sensor included)7738111002MC400 cascade module (up to 4 boilers with RC310)7738113392MM100 zone module (1 cylinder or 1 heating circuit)5991376FV/FZ sensor (for heating circuit or low-loss header)7736702647MX400 module set (boiler control from the mobile app over Wi-Fi)
Frequently asked questions
What is the output of the GB172i.2-40?
The GB172i.2-40 has a nominal heat output of 40.0 kW at 50/30 °C and 39.8 kW at 80/60 °C.
How do I get a price quote for the GB172i.2-40?
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