I need a small heater for my bettas but....?

Question

I need one for like 5-7 gallons. How much money does it cost to run it?

Answer 1

The wattage for a heater that small I'm unsure of but i do know that they are relatively inexpensive, wal-mart less than 15 bucks. the cost of running the appliance depends on the temp difference in the tank and the room its in, if the temp in the room is 70 and you want 78 degree water it has to work a little harder, the wattage also depends on how many degree's different the tank and room are, but with tanks that small i dont think its as big of a deal.