Just add water to a bucket, connect to electric source and place in an insulated worm bin.

Polyethylene coated aluminum sheath --- Immersion-type electric heater --- Rated 200 watts @ 120 volts --- Energy efficient with minimal operation costs --- Thermostat maintains water at 40°-50° F. --- Heavy-duty electrical cord with grounded plug --- FOUR-YEAR Manufacturer Guarantee

NELSON MANUFACTURING CO., 3049 12th Street SW, Cedar Rapids, Iowa 52404