How much does it cost to use a heated bird bath/ bird bath heater?

There are several variables that make it intricate to give a definitive response to this question.

In reality, the cost of using a heated birdbath will largely hinge on the temperature that actually differs hugely over the coldest period of the year and whether the birdbath is in the sun.

Anyway, you can reduce the cost if you’re going to opt for those models which are energy-efficient or the ones that are powered by solar energy.

More bird bath questions: https://birdingdepot.com/best-heated-bird-baths/