Fits Any Home and Budget with high performance at an attractive price. 

Outstanding Efficiency of 95.2% A.F.U.E. on all models. 

Lasting Performance with industry-leading Viessmann made SA240 316 Ti stainless steel Inox-Radial heat exchanger constructed to CSA B51 and ASME Section IV. 

Low-Emission Combustion with Viessmann made stainless steel MatriX cylinder burner for natural gas. Factory calibrated. 

Versatile On-Board Boiler Control interfaces with most external controls. Now with integrated 0-10V and OpenTherm® communication ability. Outdoor temperature sensor standard. 

Greater Venting Flexibility.

Suitable for Altitude Levels of up to 10,000 ft. / 3000 m. 

Easy Installation, Service and Maintenance with all pipe connections located at the bottom and serviceable components easily accessible from the front. 

Extremely Quiet Operation; quieter than most refrigerators. 

Compact, Lightweight Design and zero clearance to combustibles. / 3000 m. 

Built-in Automatic Frost Protection prevents freeze-up during long shut-off periods. / 3000 m.