Pail Heaters primarily designed for use with plastic pails, these 5 gallon aluminized steel heaters are factory engineered to maintain a constant temperature while in contact with a full pail. Will also work on metal pails. Round Heater fits tapered and straight sided pails 9 1/2 in. - 12 in. in diameter. 120 volt AC, 100 watts. Square Heater fits 9 3/4 in. square straight-sided plastic pails only. 120 volt AC, 145 watts. Both heaters are UL-Listed and CSA certified. Supplied with 6 ft. cord and 3-prong plug.