bird baths

[janeslovesbob]

How can I keep my concrete bird bath from freezing and breaking during the cold weather? Also I have a bird bath that leaks and don't want to throw it away. Can I coat the inside with something that won't hurt the birds? Help! It is getting cold outside.

[Newt]

You can purchase a bird bath heater. I prefer the type that has a thermostat so it turns off and on when needed. I use them for my birdbaths. I prefer this flat type.
https://www.duncraft.com/merchant.ihtml?pid=702&lastcatid=22&step=4

Here's another model.
https://www.nelsonmfg.com/bird-bath-heater.htm

If your leaky birdbath has a crack you could use a marine silicone caulk.

Newt

[opabinia51]

Another option is to drain the water for the winter. Water expands when it freezes thus applying pressure on the concrete and breaking it.