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LOL
Exactly
You can't fight the Physics.
You have to make them work FOR you
I suspect the ideal heater would be an insulated box the same shape and outer size as your waterer, and just tall enough to house the light fixture.
Then put a tile or metal top, so all the heat is directed...
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It is heating and radiating, but most of the heat is radiating nowhere near the water.
On the dog bowl, the entire heated area is UNDER the water.
On the block, about half of it is NOT under the water.
Find a base that's the same size, or even little smaller than the bowl, so ALL...
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I'd take the tile off the top of the block, and insulate the inside of the block
The difference is your bowl is only heating the water and itself, while the bulb is heating the block, the tile, the bowl AND the water
Also, how many WATTS is the dog bowl?
How much water os on the...