All E-Founts have 50 watt heat elements and adjustable thermostats.  At -25°F for a week an E-Fount waterer will only use about 4 kilowatts of electricity.  They're the most economical electric waterers available today.

SPECIFICATIONS for 3465-E

Gallons	8
Dimensions	22" W x 36" L x 27" H (22" drinking height)
Heat	Optional 250 watt submersible heater
Exclusive 5 year warranty

SPECIFICATIONS for 3330-E

Gallons	15
Specifications	One 8.75" opening / 9" ball closure
Dimensions	26" x 28" x 14" tall

SPECIFICATIONS for 3410-E

Gallons	6
Specifications	Two lift-up lids / 10" openings
Dimensions	19" x 34" x 18" tall