Bradford White Corporation is a team of American-owned companies that designs, engineers, and builds water heating, space heating, combination heating, and storage solutions for residential, commercial, and industrial applications.

Burnham Commercial produces steam and hot water boilers for commercial and industrial applications. Burnham Commercial offers scotch, firebox, and cast iron boilers ranging from light commercial to industrial sizes.

Chromalox is a thermal technology company. They engineer thermal solutions for the world's toughest industrial heating applications. Their Heat Trace segment delivers temperature management solutions for piping systems, valves, and tanks.

In 2022, the Professional Plumbing Group (PPG) joined the Marcone Group. PPG and its affiliated companies – which have a history stretching back 150 years – design, manufacture, market and distribute high-quality plumbing products and solutions.

Established in 1914, MSA Safety Incorporated is the global pioneer in the development, manufacture, and supply of safety products that protect people and facility infrastructures. Many MSA products integrate a combination of electronics, mechanical systems, and advanced materials to protect users against hazardous or life-threatening situations.

U.S. Boiler Co. provides hydronic residential home heating with reliable, efficient, modern designed products that are made in America.

Velocity Boiler Works are manufacturers of gas-fired condensing and non-condensing boilers, oil boilers, indirect water heaters, hydronic air handlers and warm air furnaces.

Warren Controls Inc. is a renowned US-based manufacturer of control valves and related products for industrial process/general service and specialty applications, HVAC - building automation, Military/Marine, boiler components and OEM specialty valves.