The Xtreme Heat, from the manufacturers of T.H.E. Machine Co.'s Thawzall products, features a Burnham 1 million-plus Btu/hour boiler and is now available with either fuel oil/diesel or natural gas/propane burners. Xtreme Heat is sheeted and trimmed with aluminum, as are all Thawzall models. Four accessory-unit heaters are included as standard, and each accessory-unit heater provides 250,000 Btu/hour with a three-speed controlled 3,200-cfm blower. The Xtreme Heat is fume free and has a low noise level. In addition to temporary heating, Xtreme Heat also has ground defrosting and concrete-curing capabilities.