The MK 54 Lightweight Torpedo was previously known as the Lightweight Hybrid Torpedo (LHT). The MK 54 Mod 0 Lightweight Torpedo integrates existing torpedo hardware and software from the MK 46 ...

And if you've eyed such options at Harbor Freight, you've likely come across its portable propane torpedo heater, which packs some solid power with an output between 30,000 and 60,000 BTU.