Who is laars heating? Learn About Who We Are. Laars Heating Systems is one of the nation’s leading boiler and water heater manufacturers for both residential and commercial heating. From high-efficiency, combination systems for residential heating and hot water to systems that supply entire stadiums, the Laars family of more than two dozen heating products...How do i contact laars by phone? LAARS Headquarters. 20 Industrial Way. Rochester, NH 03867. Phone: 603.335.6300. Fax: 603.335.3355. LAARS Sales and Service. Phone: 800.900.9276. Fax: 800.559.1583.Where is laars located in new hampshire? LAARS Headquarters. 20 Industrial Way. Rochester, NH 03867. Phone: 603.335.6300. Fax: 603.335.3355. LAARS Sales and Service. Phone: 800.900.9276.