Infratech Marine Grade Dual Element 39 Inch 4000 Watt Heater CD-4024-MG | Infratech Heaters
King Electric 4000 Watt Watt 13648 BTU BTU Electric Wall Mounted Space Heater | Wayfair
Cadet Com-Pak Twin Electric Wall Heater Assembly Only Without Thermostat (Model: CST408, Part: 67530), 13648 BTU, 208 Volt, 4000 Watt: Amazon.com: Tools & Home Improvement
King Electric PGH2440TB 4000-watt 240-volt Garage Heater with Mounting Bracket | Walmart Canada
Infrared Heater Term2000 IP67 Multi 4000 Watt 400 Volt | Home & Commercial Heaters, Ventilation & Ceiling Fans | UK