Universal Engine Heater Company is a Manufacturer of Quality Industrial Tank Type Engine Block Heaters for use on Standby Emergency Generators, Heavy Equipment, Diesel and Gas engines, Marine Applications and a variety of other applications. Universal Engine Block Heaters are MADE IN THE USA. All parts are replaceable. Full one year warranty with a limited second. Universal Engine Heater Company stands by our product and supports our customers. Less than a 1% return. Next day air shipments are available.