The only problem with the rivets I can see is the quality of the revet. Soldering is fine too as long as you can do it well. I personally would try 'old' school rivets and roves but then again I have a case sitting in the shed. The only thing to consider is Canadian law, if you are running a business out of your home it may be far cheaper to just buy UTH (like ultratherms) than use heat tape. To comply with wiring in commercial space you need an electrician to wire everything. Failure is very serious (no insurance coverage and criminal negligence causing, damage, injury, or death, carries jail time) Just in case that is a consideration. I would suggest as the new heat tape runs hotter than safe temps (over 100ºF) a failsafe be added.
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