[combat1]

looking at the price of aquarium heaters i'll give it a go!
I need to heat around 200 litres so guessing a 200watt heater would do it, for the guys that use the aquarium heaters is this correct? and how long do you need to have them on for, Thanks guys.

[Smudger]

Get the most powerful you can, 200 watts will heat 200 litres but take a good part of 12 hours to reach anything decent temp wise and 500 watt or better 1000 will heat that amount in 4 hrs. But to make the best of heating this way you really need to circulate the water or have water movement in the tank

Darran

[Neil Gornall]

I use something similar to this to circulate the water. It does seem to help

http://tinyurl.com/ppcl5ry