Reddit reviews Cozy Products CL Cozy Legs Flat Panel Radiant Desk Heater

No problem! Also, you may try this for the heater instead. Never used it personally, but I've heard it's a good alternative for heating the kotatsu.

There's a lot of DIY guides online, many of them suggest ordering an imported dedicated kotatsu heater off Amazon like this, though you may need to also get a voltage converter as Japanese appliances run on 100V. Some people also use a radient desk heater like this, but I found it wasn't warm enough.

Try this instead: https://www.amazon.com/ss/customer-reviews/B00FRFFC4W

The voltage is correct, you can attach it to a table you already own, and it's much safer and cheaper than trying to import one from Japan.

My feet and hands are always cold unless it's fairly warm. That's partly because I just have that gene, but also because I'm female and because I have some problems with fingers/hands/arms which probably make it worse. (Supposedly females keep more blood in their trunk areas than males to protect any possible pregnancies; males may pay for those warm hands though in cardiovascular disease, longevity, etc.)

I have all kinds of helps though for both hands and feet, like these:
...light from a gooseneck lamp (with halogen bulb) shining down on my mousing hand while at computer (this works very well), or shining on one or both hands if doing certain other things... "reptile heating bulbs" can also work
...almost always have a down-filled quilt (or part of one) on my lap and feet, and when at the desktop computer (or reading on iPad/Kindle) have other hand nestled in or under the quilt
...holding my hands under hot running water from sink for 10 or more seconds (warming effect can last a while)
...there are also electric "hot paraffin wax" appliances for those with arthritis, but they also work for just bringing and keeping warmth/blood to hands or feet
...putting hand/s under/on various kinds and shapes of "heating bags" I've made or bought (the simplest being an old sock with rice or beans inside, heated up in a microwave for a couple of minutes)--put one of these between sheets near feet on cold nights too, so great
...small electric heater near my feet (often radiant heat but also use small forced-air heat and some are even flat panel with no exposed coils**, etc, and/or electric flat "dog bed heater," etc to put feet on
. . . there are also ways to close off the area under a desk, usually with some kind of heating device inside as well, so that the whole area from lap to toes will be in a heat "bubble":
http://www.permies.com/forums/posts/downloadAttach/1612
in Japan, they're called kotatsu:
https://www.google.com/search?q=Japanese+heat+table+desk
https://www.google.com/images?q=feet+warm+desk+blanket+light+heater
(many ideas and equipment, including using a "warm mouse" and "warm, keyboard," etc.) http://www.richsoil.com/electric-heat.jsp
...heated slippers, various prices:
https://www.google.com/images?q=heated+slippers
...two pairs of socks, or one pair on with cut-off tops of socks over ankles
...good slippers, often with wool or at least fuzz
...if I ever build a house, I might have heated floors built in too (heated water in pipes or other methods)

** http://permies.com/t/4906//making-electric-heat (scroll almost to the bottom to see the bulb and set-up on desk
https://www.google.com/images?q=hot+wax+hand+bath
(unfortunately, the cheaper ones don't work as well or the wax can't be reused as often or something compared to the more expensive ones)
**** http://www.amazon.com/Cozy-Products-CL-Radiant-Heater/dp/B00FRFFC4W