We still have a good supply of the surplus M67 Immersion Heaters but once they run out there will be no more, as these are no longer used by the US military. Our customers keep finding new and innovative uses for them.
For those not familiar with them, they are very simple. A steel body submerges the combustion chamber under the level of the water to be heated, fuel drips down from the fuel tank controlled by a valve you use to adjust the fuel rate, it hits a cast iron plat to vaporize it, burns in the circular combustion chamber, then the exhaust goes around and up the exhaust stack. No moving parts while it burns at all, so they are very reliable.
Fuel? The military used gasoline, and listed diesel and kerosene as permissible fuels in an emergency. My customers, being an innovative crowd, have used gas, diesel, kerosene, old waste gas they get for free from from junkyards and boat shops, any of those fuels mixed with used motor oil, biodiesel, Coleman fuel, waste jet fuel from a job at the airport, and a lot of blends of all of the above.
So what uses have they found so far:
- Heating stock tanks that they use for watering livestock. They run them an hour or so in the evening and the water gets warm enough to not freeze all night. They say surrounding the tank with dirt helps insulate it.
- Heating a greenhouse. They install the heater in a large water tank and run the stovepipe just like a wood stove. They get the water nice and hot running it for an hour or two, then when they turn the heater off the large tank of hot water radiates heat all night.
- Heating a hot tub or pool without using electricity.
- Heating waste vegetable oil used to make biodiesel in order to boil the water off to make it usable.
- Heating hot water for showers and dishwashing at remote hunting cabins- one customer made a heat exchanger from an automotive heater core that he plumbed into the tank of water heated by the immersion heater, as water flows through it gets heated.
- Heating large amounts of water to scald chickens, ducks or hogs as part to the butchering process.
- Heating an ice fishing shack, set on cinder blocks (not sure I trust this, but they say it works great)
And there are more I am sure I am forgetting. For less than $60 it is hard to beat these things for the amazing number of uses they have for a farmer, prepper, (have you considered how to get hot water without electricity?) hunter with a remote cabin, and lots of other folks.
I just sent one to Jack who does the Survival Podcast to get his review of them and input on uses, and I bet he comes up with even more great uses. If you don’t listen to his show, give it a try- he does a great job.
How are you using one of these? Let me know!