Viessmann Vitodens 200-W B2HAH65 Two-Boiler Package, 704,000 BTU, Less Manifold

The Viessmann B2HAH65 package combines two wall-mounted Vitodens 200-W B2HA 352k condensing gas boilers for large homes and light commercial buildings. Together they provide 704,000 BTU/h of input with staging and redundancy, and the package comes without a factory manifold so the primary loop can be built to suit the job.

Each boiler uses a stainless-steel Inox-Radial heat exchanger and a MatriX modulating cylinder burner, modulates up to 6.5:1 and reaches up to 94.5% CSA thermal efficiency. Splitting the load across two units adds redundancy for spaces that must stay heated. The boilers support outdoor reset and cascade control to coordinate both units across mixed-temperature circuits, and they operate up to 10,000 ft.

Direct venting can be coaxial or two-pipe with maximum runs up to 131 ft depending on layout, and up to 4 boilers can share a common vent. The boilers are built to ASME Section IV and CSA B51, tested to AHRI BTS-2000, run on 120 VAC, 60 Hz and convert between natural gas and LP. Headers and manifold piping are not part of the package.

Highlights

• Two Vitodens 200-W B2HA 352k boilers, 704,000 BTU/h combined input

• Up to 94.5% CSA thermal efficiency; up to 6.5:1 modulation per boiler

• Less manifold: build a custom primary loop and headers

• Coaxial or two-pipe direct venting, runs up to 131 ft

• Common venting of up to 4 boilers; NG/LP convertible

Specifications

In the box

• Two Vitodens 200-W B2HA 352k boilers (no manifold or header)

Good to know

• Gas-fired appliance: it must be installed, vented and commissioned by a qualified installer in line with local codes and the manufacturer's installation manual.