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Get Powered Up! Certified Energy Manager Jeff Yago answers your alternative energy questions

Wondering about a great new energy-saving device
you found on the Internet? Then CLICK HERE!

Sorry. Jeff no longer answers questions online.
This will remain as a searchable
resource for all BHM website visitors.

Archive for the ‘Solar cooker’ Category


Small water boiler

Monday, August 11th, 2008


Great web site.

It’s great seeing what other people are up too and knowing that you are a bunch of people trying to make the world a better place too. We both live in incredible time Hey? :)

Well I am wondering if you know how to make a small water boiler, one that would boil an egg. For example maybe a jar painted black with the lid on and egg inside. I have tried this before, it took quite a while……..

Anyway :), just wondering if you have any ideas or information on those kinds of home made water boilers.

Hey, thank you so much, G’s your gorgeous



Haven’t heard the egg in the jar and really doubt that it works. The problem is you need to increase the temperature of the sun’s rays falling on any surface, and the only way to do that is to concentrate a large area of sunlight onto a smaller area, like a magnifying glass operates.

Most homemade solar cookers have a large area of reflector surface area around a small cooking area that reflects sunlight back onto this smaller area which increases the temperature. If you want to stay with your boiling egg in the jar system, use a jar that is rated for heating and place all but the top of the jar down in an insulated larger coffee can. Make cardboard or plywood “fins” on each of the four sides that can be tilted on hinge points attached to the rim of the can, and cover their surface with the shiny side of aluminum foil. I would make each side around 12″ x 12″ square, but you may need to taper the lower ends near the jar so they clear each other when folded up.

Good luck!

Jeff Yago

P.S., I cut that photo out of some old movie-star magazine – not sure who it really is.



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