Viessmann Vitodens 200‑W B2HA‑399 | 399,000 BTU Wall‑Mounted Gas Condensing Boiler
Want big boiler performance without taking up floor space? The Vitodens 200‑W B2HA‑399 is a wall‑mounted, high‑efficiency gas condensing boiler built for larger homes and light‑commercial projects. It modulates smoothly from 113–399 MBH to match real‑world demand, and its Inox‑Radial stainless steel heat exchanger helps keep efficiency high season after season.
- Brand: Viessmann
- MPN: B2HA‑399 (Vitodens 200‑W)
- Type: Wall‑Mounted, Category IV Condensing Gas Boiler
- Fuel: Natural Gas or LP (conversion kit available)
- Input Range: 113–399 MBH
- Heating Output (Typical): up to ~375 MBH
- AFUE: ~94%
- Modulation: Up to ~6.5:1
- Heat Exchanger: 316Ti Inox‑Radial Stainless Steel
- Combustion Control: Lambda Pro with Fully Modulating MatriX Cylinder Burner
- Venting: Direct‑vent sealed combustion or room‑air (per code)
- Vent Options: Concentric 100/150 mm (≈4"/6") or Two‑Pipe Systems
- Max Equivalent Vent Lengths: Generous runs (layout‑dependent; see manual)
- Heating Connections: 2" NPT supply/return
- Gas Connection: 1" NPT
- Electrical: 120V, 60 Hz; outdoor temperature sensor included
- Controls: Vitotronic 200 (HO1B) with outdoor reset and diagnostics
- Dimensions (W × D × H): ~23‑5/8" × 27" × 44‑1/2"
- Clearances: 0" to combustibles at vent; service clearances per manual
- Cascade Capability: Common‑vent/manifold options; up to 8 boilers
High Efficiency, Clean Combustion
The fully modulating MatriX cylinder burner and Lambda Pro combustion control keep the air‑to‑fuel mix dialed in—even when gas quality varies—helping the system run efficiently and cleanly.
Big Output, Right‑Sized Modulation
With 113–399 MBH input and up to ~6.5:1 modulation, the 200‑W can idle on milder spring/fall days and ramp up for peak demand. That reduces short‑cycling, improves comfort, and helps components last.
Compact, Wall‑Hung Footprint
A cabinet roughly 24" wide × 27" deep × 44‑1/2" high saves floor space in tight mechanical rooms. Front‑access design keeps annual service straightforward for your contractor.
Flexible Venting For Retrofits
Choose concentric 100/150 mm (≈4"/6") or two‑pipe systems with generous equivalent lengths. Use direct‑vent sealed combustion or draw room air where code allows.
Outdoor‑Reset Intelligence
The integrated Vitotronic 200 control with outdoor reset automatically adjusts water temperature to the weather, helping lower fuel use while keeping rooms comfortable.
Cascade‑Ready For Larger Loads
Need more capacity? Manifold up to eight Vitodens 200‑W units with common venting. The system stages boilers only as needed to match the load and maintain high efficiency.
