Right. So mineral insulated cables too - as PVC can catch fire?
The costs are more significant if DIYing.
I'm surprised any serious DIYer doesn't already have a blowlamp. They're hardly expensive. Although the sort used by most pros - with a separate gas tank - are more expensive to buy, but cheaper to run.
Yes - I must admit to having more problems getting a seal to things like plastic cistern feeds than with miles of copper. ;-)