how bout flexwatt on a fish tank? :D

[JKExotics]

It wont heat the water. Also, it might be a bad idea, high heat on the glass + cold water seems like to me it would break the glass.

I could see this happening.

[takagari]

at no point did i say i didnt have tank heaters, or another setup i have a 90g tank on a 30g sump, heated with dual 200 watt heaters,

I am simply looking into the idea, but after considering the watt/per foot of these things compared to the aquarium heaters, I'm starting to see that i would need a butt load to get enough heat, the bottom and the whol eback would need to be heat taped.

Heh

I was just thinking allowed :p

[jrosen123]

As someone who works very frequently with fish tanks, and specifically a big tank, it will be more convenient, easier and safer to be using commercial water heaters.

There could be issues with the sealing around the tank if you heat it from the outside.

Sorry if I have repeated anything that was already said on this thread

[Ranegyr]

First of all, i live in an apartment so i can't try it. I know what the label on a zoo med UTH says and i understand the science behind the risk. But, i have wondered the same thing. I say, hook up at 10 gal, place the appropriate size piece of FlexWatt, and tell us all what happens.

Maybe i am just addicted to mythbusters. Who knows?

[Dragnbaron]

It would work and no it wouldn't crack, but it wouldn't be safe. The only time it would crack is if the water was extremely cold and the glass was extremely hot. It takes a temp change of more than 50 degrees in order to cause the glass to crack, and if it's tempered it takes MUCH more than 50 degrees. Think about it, the windoes in your car are tempered, it can be -50 outside and 80 in your car and the glass won't crack.
It's work, but it would heat the glass up, then the glass would heat the water up. It would work VERY slowly but it would work. Great for bottom dwellers, but that's about it. Then you have a safety issue. If water starts to leak you have an electrical fire, and noone wants that.

[Lucas339]

i wish i had to worry about heating my tanks but i have to worry about cooling them. remember that fish tanks run around 2-4 degrees warmer than your house temp.