The Series 3 shares many of its features with the award winning ES2, including the durable cast iron heat exchanger, rugged heavy gauge steel base, and the innovative IQ Control System. The IQ Control System allows the Series 3 to be easily equipped with an optional energy saving control package that, according to many studies, can deliver up to a 15-20% reduction in fuel consumption. In addition, the Series 3 provides even more flexible chimney venting options making it the right choice for millions of homes.

  • The ultimate replacement boilers, saving money through system efficiency.
  • Can be installed in virtually any home heating system.
  • Reliable performance, quality construction.
  • Unique and innovative control system.

The best boiler for most homes

No matter how efficient a boiler is, if it doesn’t operate efficiently in a home’s heating system, it’s not an efficient installation. IQ gas boilers are designed to handle the high water-volume systems which are present in most homes. They have also been designed to operate at lower temperatures than conventional cast iron gas boilers. This means that the boiler doesn’t need to fire at a high rate to maintain home heating comfort, which translates into greater system efficiency and lower heating bills.

Built to save, built to last, made in America 

When it comes to home heating, every BTU is precious. U.S. Boiler Company understands, and takes energy efficiency seriously. From thick insulated plates and seamless corners in the burner base to the insulated steel jacket, every IQ boiler is designed from the ground up to keep heat in the heating system. The cast iron heat exchanger is the heart of these boilers. It is manufactured in Zanesville, Ohio and is designed for years of reliable service. Each heat exchanger is water and pressure tested prior to assembly. The boilers themselves are built in Lancaster, PA. Every component used in the IQ family of boilers is subject to strict standards of quality control and performance verification which are used throughout the manufacturing process.


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