The most energy efficient Slant/Fin boilers are the CHS and Jaguar J-360 gas-fired modulating, condensing units. The CHS boiler is 95 percent energy efficient, while the Jaguar boiler operates at up to 96.1 percent efficiency.
The Energy Star-rated Slant/Fin CHS boiler is equipped with a stainless steel heat exchanger and digital control board. This unit is available in eight different models with inputs ranging from 85,000 BTU to 399,000 BTU. The Jaguar J-390 has a cast aluminum mono block heat exchanger and digital control board with built-in Link cascading controls. A single Jaguar boiler ranges in inputs from 110,000 BTU to 390,000 BTU and is designed for both single and multiple boiler applications.