Bock Water Heaters Inc. has announced the appointment of Terrence Mullen to president/CEO.

Bock Water Heaters Inc., a leading manufacturer of gas- and oil-fired commercial water heaters, has announced the appointment of Terrence Mullen to president/CEO.

Mullen joined Bock in 2003 as its chief operating officer. He had previously held executive positions at RB Royal Industries, Fond du Lac, Wis., and Bou-Matic, Madison, Wis.

Mullen succeeds Donna Sheehan, who, in her 40-year career at Bock, was instrumental in the company’s transition from privately held to ESOP ownership. Sheehan will assume the role of director of customer relations.