11" wide- Flexwatt x 24" long (or similiar brand of heat tape) would be my choice as well...(as above). I've used the actual brand Flexwatt for decades now, haven't had
try any of the "look-alikes" yet. And just to reiterate, it's called "UTH" because it must go outside the tank, underneath, & yes, you need to regulate it too.
(UTH = under tank heat)
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