Most efficient way to boil water on a boat

[sparrowhawk1]

Some members have been discussing using alcohol as a backup stove. https://youtu.be/wTbAVPdwzqQ. How to make one out of two soda cans.
And notice the title is most efficient alcohol stove.

[sparrowhawk1]

This one looks even more efficient and much easier to make.https://youtu.be/v9fLywrPq-8

[beiland]

Originally Posted by SSgtPitt

What started out as a simple question of the most efficient way to boil water ( which i thought was a joke ) has now morphed into a very interesting thread with numerous helpful inquiries; buying and filling propane / butane bottles in many different countries, the dangers of integral tanks, induction vs microwave vs electric kettles, diesel and wood heating, solar and LifePO4 batteries and then removing all gas and going all electric and how to feed that monster.
You could spend days and days following up, learning and researching all these quandaries.
I for one am enjoying the sh*t out of this and am now looking for induction and convection items that'll fit on my 1982 36' boat as well as solar to keep it all going.
The links to quality equipment and further info are especially appreciated.

"If you can't say something nice, then say nothing at all" - Kindergarten
"Better to remain silent and thought a fool than to speak out and remove all doubt." - Lincoln

I particularly enjoyed this posting, and the trailing quotes as well

[foufou]

On a sunny day I prefer boiling water with my fresnel lens and a recycled aluminum can. Sunless days propane

[sparrowhawk1]

Also can run on twigs and scrap wood. https://youtu.be/Kh32NowdQa8

[sparrowhawk1]

Super compact and runs on free fuel. Fan can run off 12 volt house bank. https://youtu.be/ufY1_v8aNUo

[sparrowhawk1]

And the famous kelly kettle
https://youtu.be/wAe-CsTgFus

[sparrowhawk1]

https://youtu.be/BsnCsdOdaoE. Charge phone while boiling water.