No, definitely not. Realize that a bird bath heater’s job is to keep water unfrozen, which means 33 degrees or so—they don’t create a Jacuzzi for the birds. Bird Bath Heaters draw very little energy and most are equipped with a thermostat to turn off when the temperature is above 34. The best safety tip I can give you is to wrap the connection to the extension cord with electrical tape and you should get a good moisture seal.