Outstanding Efficiency of up to 98% with full modulation and 95.1% A.F.U.E. on all models.
Lasting Performance with Viessmann-made SA240 316 Ti stainless steel Inox-Radial heat exchanger constructed to ASME Section IV and CSA B51.
Low-Emission Combustion with fully-modulating natural gas stainless steel cylinder burner. Factory calibration eliminates adjustments in the field.
Control Variety Integrated boiler control interfaces with any level of third-party control
Multiple Venting Options
- Horizontal or vertical sealed combustion coaxial vent system (factory supplied).
- Horizontal, vertical or hybrid sealed combustion double-pipe vent system (field supplied).
- Horizontal or vertical single-wall vent system (field supplied).
Easy Installation, Service and Maintenance with all pipe connections located at the bottom and serviceable components easily accessible from the front.
Compact, Lightweight Design and zero clearance to combustibles make it a great choice for limited-space installations.
Extremely Quiet Operation; quieter than most refrigerators.
Built-in Automatic Frost Protection allows boiler to be shut off for an extended period of time while protecting it against freeze-up.
Suitable for altitude levels of up to 5000 ft. / 1500 m.
Limited Lifetime Warranty in residential applications.