Guaranteed to provide your birds with water down to -20°F. Thermostatically controlled and insulated. Fits any 14" birdbath ring, such as the 14" Twist-On Birdbath ▶
or the 14" Clamp-On Birdbath ▶
(both sold separately). The unit is not recommended for placement on the ground or in large bird bath bowls which may fill with water. Possible water seepage will damage the product and void the one year warranty. By Erva.