Viessmann Vitodens 100-W 25kW System Boiler (3203683)
The Viessmann Vitodens 100-W 25kW System Boiler (B1HG) is a compact, high-efficiency gas condensing boiler designed for modern domestic heating systems.
Combining Viessmann's stainless steel Inox-Radial heat exchanger with the MatriX-Plus burner and Lambda Pro combustion control, the Vitodens 100-W offers reliable, efficient performance with a wide modulation range and straightforward operation.
Integrated WiFi provides connectivity to the ViCare app, allowing homeowners to control their heating remotely, while installers can benefit from guided commissioning and servicing through Viessmann's digital platform.
Viessmann product code: 3203683
Supersedes previous Viessmann product code 7988418.
Key Features
- 25kW system gas condensing boiler
- Rated heating output range: 3.2–25.0kW at 50/30°C
- Stainless steel Inox-Radial heat exchanger
- MatriX-Plus burner with Lambda Pro combustion control
- Standard efficiency up to 98% (Hs)
- Modulation range up to 1:10
- Integrated WiFi connectivity
- Compatible with the ViCare app
- Energy-saving high-efficiency circulation pump
- Simple LCD touchscreen operation
- Suitable for natural gas and LPG
- No LPG conversion kit required
- Certified for operation with natural gas containing up to 20% hydrogen
- Energy efficiency class A
Smart Control with ViCare
The Vitodens 100-W features an integrated WiFi interface for connection to Viessmann's ViCare system. This provides convenient control of heating programmes and system settings from a smartphone or tablet.
- Remote heating control through the ViCare app
- Heating programme and temperature adjustment
- Compatible with the ViCare Thermostat
- Guided commissioning and servicing support for installers
Technical Data
| Boiler type | System boiler |
| Model | B1HG |
| Viessmann product code | 3203683 |
| Previous product code | 7988418 |
| Rated output at 50/30°C | 3.2–25.0kW |
| Rated output at 80/60°C | 2.9–23.0kW |
| Dimensions (H × W × D) | 700 × 400 × 360mm |
| Weight | 32kg |
| Flue gas connection | 60mm |
| Ventilation air connection | 100mm |
| Energy efficiency class | A |
| Fuel | Natural gas / LPG |
What Else May Be Required?
Depending on the installation, additional components may be required, including:
- Suitable Viessmann flue system
- Cylinder connection set and DHW cylinder temperature sensor
- ViCare Thermostat or compatible heating controls
- Outdoor temperature sensor for weather-compensated operation
- Pre-plumbing jig or mounting accessories where required
Please check your installation requirements before ordering. If you're unsure which accessories or controls you need, contact B.E.E. and we'll be happy to help.
Compatible Controls & Accessories
The Vitodens 100-W can be used with a range of Viessmann controls and system accessories, including ViCare controls, PlusBus extensions, cylinder sensors, low loss header components and installation connection sets.
Need help selecting the correct Viessmann boiler or accessories?
Contact B.E.E. with your system requirements and we'll help you put together the correct equipment.