O-470 and IO-470
O-520 & IO-520;IO-720
300 watts or less / Thermostatically Controlled
110/120 volts (models 441 and 540 are available in 220 volts).
3 to 5 hours on cold soaked engine, although, since unit is thermostatically controlled, it may be left on overnight, or all the time. Cowl covers and prop covers are recommended for extreme cold weather, They also reduce preheat time.
4x7 pad W/O a lighted cord and NO peel and stick back.