Thanks. That looks like a really nice heater but seems to be a lot more expensive for me to get (Im in Europe). I can get an aquael easy heater for only about $20 by ordering from Germany. The neo is more expensive but still cheaper than the prices for the cobalt ones I have seen.
The Aquael heater & Cobalt heater look like they're the same technology but different name brand. I seen all the Cobalt products being demonstrated at the fish convention, but I already had more than enough heaters so I wasn't in the market for a new one.
Get whatever brand is available in Europe. I don't think it snows in Portugal, so a 50watt model should be more than sufficient for your 8 gallon tank.