I have an under-sink sump in my garage with the p-trap, sump bucket and about a 1.5 feet of water in the riser above the check valve before it goes into the house.
The pipes and bucket are ABS.
I have been paying close attention to the temps in the uninsulated garage, and they have gotten close to 0.5C at times but no lower.
I thought about boxing it in and adding a light bulb, but I got a good deal on 6' of heat tape.
When it arrived it stated in the instructions it is only for supply lines. I am not sure if this is because they don't think the tape will do the job on a larger diameter pipe, or because it could melt the pipe?
Can anyone shed some light on why they say it should only be used on supply pipe?
Thank you,