The best replacement for propane torch is butane torch.

The best alternatives to propane torch are rated as following:
★★★★★  butane torch
★★★  acetylene
★★  mapp
★  acetylene torch
★  heat gun
★  mapp torch

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Speaking about propane torch, one probably shouldn't forget about mapp gas.

Other search terms related to propane torch and their ratings are:
★★★★★ mapp gas
★★ mapp
★ map gas
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propane torch
butane torch
acetylene