Solar heaters for little pond

[mela]

What a dummy. Forgot to put pics.

Also after it quit bubbling and hot water came out unpluggged the little pump and everything kept working. TKs

 

[mela]

Sure wish the sun would shine for a while. Guess gonna have to make some different heaters. Maby three options.

 

[Sploke]

What is the temperature of the water now, and what are you trying to get it to? I would imagine with that much thermal mass, it will take a few days (weeks?) of sunny weather to get heated up, but once it gets there it should retain the heat fairly well, depending on how far above ambient temps you are trying to hold it.