Gio, be carefull when using titanium heaters. They're so accurate that sometimes can over heat your tank by 2-4 degrees over(depending on the size). If you use titanium, Id recommend 3 watts per gallon.
In my opinion, titanium is too expensive for a 20 gal. I'd suggest a Visa-Therm or Ebo. They're accurate and durable also.
In my opinion, titanium is too expensive for a 20 gal. I'd suggest a Visa-Therm or Ebo. They're accurate and durable also.