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does anyone know how to build a kotatsu?

just wondering if there's anybody out there who knows how to build a SAFE version of one. i'd like my house not to catch fire while i'm being eco-conscious.
thanks!


Build a regular elevated futon, and instead of a raging inferno beneath you, you should makeshift duct your heater vents to the space beneath it. If the ducting is well and carefully done, it will be very effective.
Couple problems with that. :) The idea of the Kotatsu is to be able to heat the people AT the Kotatsu. If you are running the house heater, there is no reason to have the Kotatsu.

If you block all the vents but the one under the Kotatsu, then the thermostat for the House unit will be left in the cold spaces of the house, and it will run until the escaping air under the Kotatsu warms the house. Which will take for ever, and run up your heating bill.
I just finished my instructable on how to do so! Some of the materials are a bit difficult to track down but with the power of the interwebs, it's very easy to do.

Here it is - https://www.instructables.com/id/Build-an-American-style-kotatsu/
A lot of people have used the Indus-Tool Cozy Legs heater as their heating element. (http://www.amazon.com/Indus-Tool-CL-Flat-Panel-150-Watt-Radiant/dp/B0009HMFPM/ref=sr_1_2?ie=UTF8&s=home-garden&qid=1268548612&sr=8-2) It's a radiant heater and is cool to the touch. It's probably still a fire hazard, but less so than using a forced convection heater. It's probably also safer than the ones that they use in an actual Japanese kotatsu. I haven't tried it yet, but there's two reviews on Amazon.

Hoping to make one myself soon ^.^ I've been looking at this coffee table at Ikea (http://www.ikea.com/us/en/catalog/products/40135021). Of course, you can go anywhere to get a coffee table xD  Then I can get a comforter and place it over the table and then buy a table top (also available at Ikea xD) and put it over the comforter. It might take a bit of ingenuity to attach the heater to the table though.