Armstrong Hot Water Group, a division of Armstrong International, appointed Mechanical Solutions, based in South Windsor, Conn., as a Hot Water Group Specialist representing its full range of water temperature controls in Connecticut, Massachusetts, New Hampshire, Maine, Vermont and Rhode Island. Mechanical Solutions will focus on the consulting plumbing engineer. It has sales representatives based in South Windsor, Conn., Providence, R.I., Boston, Mass., and Canaan, N.H. Mechanical Solutions will coordinate its activities with Armstrong's New England sales office.