Dewalt 10,000-Watt Forced Air Electric Indoor Furnace with Thermostat
$340 new before $150 of heavy gauge copper power cord and 50AMP fuses for electrical panel install. Can run on 30AMPs (reduced BTU) or 50AMPs @240volts single phase. Rated to be ran unattended, so perfect for keeping construction sites on large homes (4,000 sq ft+) above freezing all winter long. Fantastic unit, just don't need it anymore.
The thermostatically controlled DXH1000TS Electric heater operates at 10,000 watts on a 240v single phase circuit. As a convenience, this heater can also be used at 7000 watts depending on which size circuit is available on your particular jobsite. Constructed with dual coil supports oversized ergonomic handle and very durable jobsite construction.
Here is a link to the Dewalt site for this product:
https://www.dewalt.com/product/dxh1000ts/forced-air-electric-construction-heater-107-kw