Amazon has this Omberr 4000W garage heater for $81 off. It is hardwired for a 240V circuit and includes a remote control, a timer that runs up to 9 hours, and built-in overheat protection.
It weighs 13 lbs. and measures about 22" wide, so it fits on a wall or ceiling. Shipping is free.
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Features 4000W heat output on a 240V circuit Graphene heating elements w/ iron metal housing Remote control & 0.5 to 9 hour timer Temperature range of 40 to 90°F, shown in Fahrenheit or Celsius Overheat protection shuts off heating automatically Wall or ceiling mounting w/ adjustable louvers and four wall-mount angles