I couldn’t find anything, but I’m a bit confused as it looks like the pipes are plastic. Maybe it’s a thing common in Europe.
In the UK at least I think “push-to-fit” is the standard these days for plastic water pipes and doesn’t require heating.
Is it not just a heat gun with a shaped nose? It’ll soften and expand the pipe slightly before fitting them together, where they’ll cool and constrict into place
Heat guns are also used to make plastics such as PVC piping pliable for the purposes of bending