Crown Boiler KSZ125 - 112K BTU - 84.2% AFUE - Steam Oil Boiler - Chimney Vent - Includes Tankless Coil



The Kingston line of boilers from Crown was designed from the ground up as a rock solid oil fired boiler for homes where venting can be accomplished through a chimney. At its core is a rugged, wet-base cast iron heat exchanger. The wet-base design facilitates heat transfer between the heat exchanger's metal and the system fluid, increasing efficiency. An easy-access cast iron burner door makes all internal boiler surfaces easily accessible from the front, making routine maintenance and cleaning a breeze. Crown is well known in the heating and cooling industry for their boiler's reliability and long service life, and the Kingston line is no exception. This boiler comes with a domestic hot water coil, allowing the boiler to supply your home with hot water for your shower as well as heat for your home.
  • Wet Base Cast Iron Heat Exchanger
  • The Kingston uses a wet base, cast iron heat exchanger. Cast iron optimizes heat transfer efficiency and is durable enough to provide decades of reliable operation.
  • Easy-Access Front-Opening Door
  • The Kingston burner orifice is located on a front opening burner door. All heating surfaces can be accessed for cleaning using this door, making cleaning and maintenance a breeze.
  • Included Beckett AFG Burner
  • This boiler comes with a Beckett AFG oil burner included. Beckett is a well known industry burner brand whose burners have proven reliable and efficient in thousands of boiler installs.
  • Included Domestic Hot Water Coil
  • This boiler comes with a tankless coil for domestic hot water production. Enjoy endless hot water produced entirely within your boiler, saving space in your utility room.
Product Line
Medium Learn More
Heat Exchanger Material
Cast Iron
Fuel Type Learn More
Combustion Type Learn More
Vent Type Learn More
Chimney Vent
DHW Production Learn More
Modulating/Staging Learn More
Single Stage
Mount Type
Maximum Altitude
2000 Feet
Includes Pump
Assembly Type
Burner Model
Beckett AFG
84.2 %
Input Rate
1.25 GPH
DOE Heating Capacity 
149000 BTU
Net I=B=R Capacity 
112000 BTU
Electrical Data
120 Volts
60 Hz
Flue Connection Size
7 Inches
Supply Connection
3 Inches
Return Connection
1 1/2 Inches
Product Height
31 1/2 Inches
Product Width
24 1/2 Inches
Product Depth
22 3/8 Inches
Product Weight
690 Pounds
Country of Origin
United States
ETL Listed
AHRI Certified
AHRI Reference Number
Warranty Information
Parts Warranty 
1 Year
Heat Exchanger Warranty
12 Years