Eastern Tabletop Thermostatically Controlled Electric Heater Only, 120 Volt -- 1 each.Place the magnetic plate inside the pan Attach the burner body to the bottom water pan Set your desired temperature. UNIVERSAL: Patended magnetic system securely attaches to virtually ALL chafing dishes. -- CONTROLLED: Keeps food at safe temperatures and maintains heat for an unlimited time. -- COST EFFECTIVE: One unit equals approx. 5,000 fuel cans -- LASTS: 22 Guage stainless steel housing with a limited 3 year factory warranty.