Water tank and pipes need heat

[BCGuy]

yea,i have 2-1 with different sized wires,twist them together then into the connector,3m connectors with heat shrink and/or heat shrink over the connection 

not sure they make them for 12v but for houses they have wire you wrap around your pipes

To go a bit off topic here, I was looking at stuff on walmart.ca and amazon.ca yesterday to protect the pipes in a well pumphouse.  I got the impression that you ran the wire along the pipe rather than around it.  Is this incorrect?
Thanks.

Later.
I did some looking and the answer for the product I am looking at, is it runs along the pipe.
Water Pipe Heat Tape With Built In Thermostat Keep Your Lines From Freezing