Ebay? There are options for much less than "100's of dollars"...
Here's a 1.5kw heater with pump:
Quote:
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Universal tank type coolant heater that will fit most tractors, equipment, and vehicles. These greatly improve cold weather starting. This is a high capacity 120V 1500W model. Connects to 5/8" rubber hose. Recommended for use on 26-40 quart cooling systems. Installation instructions are included. The heater has a built-in pump that circulates fluid through the block.
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Buy it now for
USD $70
Tank Type Engine Coolant Block Heater Pump 1500W Diesel KAT'S Brand Tractor NEW | eBay
You'd want a timer, too, obviously.