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Burnham K2WTC-135B Combi Gas Boiler, 95% AFUE, Single Phase, 112000 BTU, Direct Vent


Manufacturer part number:



U.S. Boiler Company


The Burnham K2 Combi is a high efficiency condensing combi boiler working as a hydronic boiler and tankless water heater. With a 10:1 turn down ratio and a variable speed combustion blower, the K2 Combi is incredibly efficient, reaching an AFUE rating of 95%.

  • The K2 Combi combines domestic hot water and space heating, all in an efficient 95% AFUE package. This unit can provide 4.5 gallons per minute at a 70 degree temperature rise.
  • The Sage2.3 system has a simple touchscreen interface built into the boiler. The system provides step-by-step instructions for changing settings and running system diagnostics, making the K2 one of the most user friendly boilers on the market.
  • A compact and versatile design allows the K2 Combi boiler to be wall hung with the pre-installed bracket and wall mount kit, keeping the K2 Combi up and out of the way.
  • The K2 Combi increases efficiency by including an outdoor sensor, allowing the boiler to lower water temperatures when the outdoor temperatures are warmer.
  • Universal Vent connection

Includes: (1) Burnham K2WTC-135B-6T00 Combi Gas Boiler, (1) Wall Mounting Kit, (1) Taco Circulator

Products specifications
Attribute name Attribute value
AFUE Rating 95%
Connection Type 1/2 inch
Dimensions 30 Inch H x 17 Inch W x 15 Inch D
DOE Heating Capacity 112000
Flue Outlet Size 3 Inch Dia
Frequency Rating 60 Hz
Fuel Type Natural Gas
Housing Material Stainless Steel
Ignition Type Spark
Input Capacity 120000 BtuH
Manufacturer U.S. Boiler Company
Net IBR Rating 97000
Vent Type Direct
Voltage Rating 120 V