McDonnell & Miller, established in 1924, revolutionised the low-pressure steam boiler industry with their advancements, which became even more significant following the development of automatic burners. This innovation led to the creation of specialised products designed for hot water boilers. Over the years, McDonnell & Miller expanded its product line through several acquisitions, maintaining a strong focus on boiler controls, liquid level controls, and flow switches. Their commitment to quality and reliability is underscored by their adherence to international standards, as evidenced by their ISO 9001 and ISO 14001 certifications. Today, McDonnell & Miller continues to be a trusted name in the provision of critical components for boiler systems, ensuring efficient and safe operations across various industries.

In addition to their foundational offerings, McDonnell & Miller has diversified its product range to cater to the rigorous demands of the oil and gas industry, where precision and durability are paramount. Their portfolio includes pneumatic valves and relay valves designed for both hazardous and non-hazardous process systems, emphasising their versatility and expertise in complex industrial applications. Controls Supply Chain, a key distributor of McDonnell & Miller products, offers an extensive array of solutions, including airflow switches, level controls, various types of valves, relief valves, and water cut-off systems for boilers and water pumps. This comprehensive range ensures that Controls Supply Chain can meet the diverse needs of the petrochemical and process industries, highlighting McDonnell & Miller’s specialisation in boiler controls and power switches. Whether for standard or specialised applications, McDonnell & Miller and Controls Supply Chain stand ready to provide the necessary components to enhance system performance and safety.