John Hugh Mailander, 80, the owner of the J.H. Mailander Co., a radiant heating firm, from 1946 until his retirement in 1972, died of cardiac arrest Oct. 18 at Peninsula General Hospital in Salisbury, Md.

Mr. Mailander, a resident of Berlin, Md., since moving there from Springfield, Va., in 1977, was born in Newport News, Va. He moved to Washington in 1935, studied engineering and went into the Navy during World War II. He received an engineering degree while in the service and became a commander in the Construction Battalion, the "Seabees." He served in the Pacific and in Italy.

He began his business in Alexandria and moved it to Woodbridge about 1962. He closed it when he retired. He was a member of the International Steamfitters Union local 602.

Mr. Mailander was the lay leader of the Stevenson United Methodist Church in Berlin and taught in its young adult Sunday school class.

His first wife, Mildred Bonning Mailander, died in 1972.

Survivors include his wife, Anne Morris Mailander of Berlin; three children by his first marriage, Margaret Ann Straub of Fairfax, Jacqueline Enman of Mount Rainier, and John H. Jr., of Sterling Park, Va.; two stepdaughters, Florence Boerger of Centreville, Va., and Barbara Virnelson of Fairfax; four sisters, Marion Cuppels of Laurel, Kate Monfalcone of Newport News, Helen Barber of Hampton Roads, Va., and Virginia Queensberry of Philadelphia; 17 grandchildren and a great-grandson.