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How to save on the heating bill AND stay warm – build a Kotatsu table!


Brr… Winter is here. The overnight temperature plunged into the 30s a few times last week. This seems a bit early to me. Usually, it doesn’t get this cold in Portland until December. The weather is strange this year. It’s been a lot drier than usual. The crisp sunny days are incredible, but this also means it’s colder. I’m not exactly sure how it works, but it isn’t as cold when we have some cloud cover or rain. It’s actually really great to have all these sunny days in October and November. I don’t think we’ve had a dry autumn like this in a long time. Anyway, it’s cold now and it’s time to convert our coffee table into a kotatsu table. Yes, I do this to save some money on the heating bill, but it is really cozy too.

Ahhh…. I love our kotatsu table. It’s so warm and toasty. We have been using our kotatsu table for over 15 years and it is still awesome! There is nothing better than warming up at the flick of a switch when you come in from the cold. Our kotatsu table is my favorite winter appliance, by far. It’s easy to DIY and it will pay for itself in the long run. I highly recommend investing a little time and building one for yourself.

*Disclaimer: You should not leave any heating device unattended. We haven’t had any problem, but everyone needs to be safe and pay close attention to your heaters. We take no responsibility for and will not be liable for anything you build. We may receive a referral fee if you purchase something from Amazon though the links in this post.

*This post was originally written in 2010. I update it every few years with the latest info. It’s much easier to buy a kotatsu table now that Amazon has grown so much.

How to build a kotatsu table

Staying warm AND save money

It’s about this time of year that all the personal finance magazines and blogs come out with articles on how to save money on heating. The usual advice to is to turn the thermostat way down and bundle up. This is good for the wallet, but it doesn’t work for us because Mrs. RB40, my wife, hates being cold. Luckily, I have a secret weapon. Our kotatsu table is the key to staying toasty and keeping our heating bill low.

We live in a condo and we don’t have gas. The heating and cooling system runs on electricity which is more expensive than gas. Our monthly electric bill averages around $60 in the warmer months and around $100 in the winter. We generally keep the temperature around 68 degrees with 2 space heaters and rely on our kotatsu table to warm up. Here is our last 2 years of energy usage.

electricity usage

The reason we were using the space heaters was because our HVAC stopped working in 2012. I just got a new system installed this spring because we plan to sell this condo soon. Apparently, the heat pump is more energy efficient than heater coil so our winter energy bill should be less this year. We’ll see if the bill is really lower as advertised.

If you’re looking for a space heater, you can’t go wrong with the DeLonghi oiled filled radiant heater. It worked great for us.

Oh, the new HVAC cost $6,600. That’s not cheap. I probably would’ve kept putting it off if we planned to stay here. The space heaters + kotatsu table worked well enough for us. Our condo is very well insulated. It hasn’t dropped below 70 degrees even with the overnight lows in the 30s. However, our condo will become colder as winter arrives with sustained low temperatures.

What is a Kotatsu Table?

What is a kotatsu table exactly? A kotatsu table is basically a covered coffee table with a heating element. It’s hard to describe the comfort level if you haven’t experienced it. Napping under the kotatsu table is heavenly. Trust me, it’s really nice.

I’m not sure where I first learned about the kotatsu table. I must have seen it in a Japanese manga or anime when I was a kid. The kotatsu table is very common there and every household has one. Most Japanese housing is not insulated well and the kotatsu table is an economical way to stay warm. Why heat the whole house? It’s much cheaper to heat your own personal space.

You could buy a kotatsu table on eBay or Amazon for $150-400, but that has some drawbacks. They used to have a high shipping cost because most kotatsu tables are shipped in from Japan. A few years ago, you could only find them on eBay. Now, you can get it on Amazon with free shipping! That’s awesome. It’s a lot more affordable now. However, there is still another problem.

One issue is that the kotatsu tables are generally pretty small. The usual tabletop size is 31×31 inches (80 cm) and most are only 14 inches high. This is too short if you’re tall. We purchased our first kotatsu table at a Japanese store in CA for about $130. After a few years, I decided to build a bigger and taller table because we wanted more space. Our DIY kotatsu table is a lot more comfortable now with the additional legroom. It is about 18” high. The 4 extra inches made a huge difference.

This small kotatsu table at Amazon looks exactly like the one we first purchased. It’s not too expensive at $168. The size is 30” x 30”. I’d go for this one if you don’t want to build your own. It’s a bit short though at 14” high.

small kotatsu table

Here is a nicer looking kotatsu table at Amazon for about $250! (It used to be $360.) The height is still 14 inches, though. The table top is 36” x 20”. That’s a bit too narrow for me.

small kotatsu table

Build your own kotatsu table

What you need

  • A Coffee table – You need to find a coffee table with two top surfaces.  The LACK Coffee table from IKEA is perfect for this, $80 at Amazon. If you have a local IKEA store, I’d get it there. The bottom shelf can be easily moved to the top. You can get it in birch, white, or brown. The LACK is about 18” high. That’s perfect for us. There are two sizes and I recommend the bigger one. The table top is a good size at 46” x 30”.
LACK coffee table kotatsu table DIY
  • kotatsu table heating elementA heating element – You can buy a “kotatsu heater” on Amazon or eBay. They used to charge $30 shipping in 2011, but now there are many free shipping options. I tried other heating alternatives, but they don’t work that well for this purpose. A small space heater, for example, seems dangerous. The kotatsu heater element is designed specifically for this use and it’s less expensive now. I wouldn’t cheap out on this. Here is one on Amazon for $75.
  • $0 old king size blanket/comforter – We have plenty of spare blankets so this didn’t cost us anything. I like the king size, but a queen would probably work too.
  • A 120 V to 100 V voltage transformer rated at 500W – You can get this transformer from Amazon for about $35. (*You need at least 500W.) North America outlets put out 120 V but Japanese appliances run on 100 V. The heating element will run hot if you don’t use a step-down transformer. Currently, we don’t have a transformer and we only use the heater on the lowest setting. Now that this item is pretty cheap, I’m ordering one from Amazon. It’ll be easier to adjust the heating element and protect against overheating.
  • Optional: Pillows to sit on.  You can also pick up some big pillows from IKEA while you’re there. It’s a lot more comfortable than just sitting on the carpet. Another cool alternative is to get some floor chairs from Amazon. Check it out. This looks pretty comfortable. However, this floor chair is not cheap at $45.
floor chair
  • belkin power switch$10 Belkin power switch – Our heating element doesn’t have a switch so I got a Belkin power switch for it. It’s a lot easier to turn on and off than physically pulling the plug every time.
  • Corner braces – You can get these from any hardware store.

Putting it together

Putting together the kotatsu table is really easy. You probably don’t even need instructions, but here they are anyway.

  1. Put the LACK coffee table together per IKEA’s instructions. Leave the lower shelf out for now.
  2. Mount the heater. I screwed our heating element right into the bottom of the coffee table. You can attach it with 4 corner braces from Home Depot as well. Or you can build a frame as pictured below. The mounting holes are on the side of the unit as you can see from the image.kotatsu table DIY build
  3. Throw the big blanket on top of the LACK coffee table.
  4. Put the bottom shelf on top of the blanket.
  5. Voila, you’ve got a kotatsu table!

If you can sit on the floor comfortably, a kotatsu table will be the best heating appliance that you ever had. We rarely used our forced air heater even when it was working. Well, the HVAC is fixed now, so we’ll see how much electricity the heat pump uses this winter. We’ll probably keep it at 70 degrees and continue to use the kotatsu table often. Our son really likes hanging out there. Oh, a side benefit is that it forces the family to hang out in the same area. We’ll play plenty of board games this winter.

FYI, the climate in Portland is moderate and our condo retains the heat well so our indoor temperature hovers around 64 degrees Fahrenheit. When we lived in a house, our gas bill would be over $150/month in the winter (over 10 years ago). The house was bigger and had more exposure to the elements. A kotatsu table should still work quite well in a colder climate. Japan is very cold compared to Portland.

Happy DIYing! How do you keep your heating bill down?

More on how to stay warm! – 10 Unconventional Ways to Save Money on the Heating Bill.


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Joe started Retire by 40 in 2010 to figure out how to retire early. He spent 16 years working in computer design and enjoyed the technical work immensely. However, the job became too stressful and Joe retired from his engineering career to become a stay-at-home dad/blogger at 38. Today, he blogs about financial independence, early retirement, investing, and living a frugal lifestyle.

Passive income is the key to early retirement. This year, Joe is increasing his investment in real estate with CrowdStreet. He can invest in projects across the U.S. and diversify his real estate portfolio. There are many interesting projects available so sign up and check them out.

Joe also highly recommends Personal Capital for DIY investors. He logs on to Personal Capital almost daily to check his cash flow and net worth. They have many useful tools that will help DIY investors analyze their portfolio and plan for retirement.
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{ 70 comments… add one }
  • Cat May 30, 2020, 9:56 am

    A real kotatsu table has an infrared heater underneath it. I spent 9 years in Japan and I think they are wonderful for organizing, reading and board game playing. The table itself is built so that the sunken living room floor underneath accomodates about 12~15 inches of leg space so it comfortably lets you sit on a pad and watch tv while sipping tea and chatting. If you have the money, try laying out tattami mats in a room with a window and a koi pond out back. This is the essence of Japanese style of living and the reason most Japanese people are homebodies…it’s feng shui, quiet living and it can really change you’re perspective on living comfortably and elegantly in style…it’s fun to go out and do the town a couple times a month, but when you come back home you ought to be living you’re best life !

    Cheers !

    @@ Cat… :”>

  • Canino November 1, 2019, 9:50 am

    In Spain (Europe) we have been using this forever, but the table is normal height, much more practical. The heating device is a small, flat electric appliance that uses little energy (in the past hot coals were used).
    The table is called ‘mesa camilla’ and the heating device ‘brasero eléctrico’. Very cheap and efficient way to stay warm while sitting!

    • retirebyforty November 1, 2019, 9:58 am

      That’s really cool! I’ve never heard of the Spanish version.
      I’ve been thinking about this for a long time. How do you keep the heat in once you sit down with a chair?
      There would be a big hole under your seat and all the heat would escape.
      Do you put a blanket over the chair or something like that?

      • Canino November 1, 2019, 11:38 am

        You can cover the back of the chair with a blanquet or a coat, but most people do not bother, the heat loss is not too big as heat tends to go upwards. The surface of the table gets warm, so your hands and arms are sufficiently warm and you can eat, read and use your laptop and be very confortable. The heater sits on the floor and typically has two settings: 400W and 800 W, no fan. Usually 400W is used.

        • retirebyforty November 1, 2019, 12:52 pm

          Thanks for the info. I will try it out with our table soon.

  • buy a kotatsu November 27, 2018, 2:50 am

    I have come to know about kotatsu when I visit the Japan 5 year ago. Since that, I start searching the kotatsu table in America and finally found a big collection of kotatsu table and related furniture online. There are very few online store from where you can buy the kotatsu table

  • David @iretiredyoung November 18, 2018, 1:41 am

    When I was reading the post, I was imagining the fire risk, but nothing has come up in the comments. However, if there was an issue, I wonder how an insurer would view it and whether they’d try to get out of any claim?
    The new place we’re getting has underfloor heating, which is a first for me. I’m looking forward to see how that feels.

  • MK Chan August 30, 2018, 10:57 pm

    I just made this table! It’s so nice and high. It’s the perfect height for me. The lack table came with L shaped brackets so I didn’t even need to buy those! Thanks for the detailed instructions! I couldn’t be happier.

    • retirebyforty August 31, 2018, 1:04 pm

      That’s great! I love our kotatsu table. We’ve used it for over 10 years now and I can’t live without it in the winter.
      Great job building one. The height is much better than the kotatsu table from Japan. They are too short.

  • Jennifer T. Rogers June 30, 2018, 12:45 am

    Perfect for those cold winter days when getting out of bed feels like a chore, Kotatsu tables let you stretch and socialize while staying cozy and it feels amazing. Thanks

  • Lily | The Frugal Gene April 10, 2018, 12:01 pm

    Oh my I never thought of this as a cost saver!!! It’s like building your own fruit/jerky dehydrator underneath the table. Part of me want a big house with a gate (confession…) but I definitely do not want it enough to try to heat it up every winter.

    • Lucy January 9, 2020, 2:47 pm

      Big houses have their charms.

      Personally I reaaaally want a traditional Chinese Siheyuan.

      But a big house that wasn’t divided into functional areas that are thermally isolated would be a nightmare for anyone who doesn’t absolutely need the space.

      • retirebyforty January 9, 2020, 8:42 pm

        I love the Chinese Siheyuan too. It’ll be great to make a kung fu movie in. 🙂

  • Cody December 18, 2017, 8:37 pm

    I used this article as a reference to build my own kotatsu, and now that it’s done, I figured it’d be worth reiterating the importance of some of Joe’s points, as well as address some concerns that others have expressed (and that I had too before building one).

    — “We also tried the “cozy legs.” It didn’t heat up enough for us.”

    Seriously, this. This is not the way to go. It’s only 150 watts, which simply isn’t enough. You can buy a kotatsu heater from 300 – 600 watts that will actually put out heat. On top of that, the Cozy Legs heater that others have used has been discontinued, so if it breaks, you’re out of luck.

    — The Belkin power switch is a good idea, but you may or may not need one depending on the model of your heater. Mine came with a switch, otherwise I would have gotten one.

    — A lot of people are worried about fire safety. The “back side” of the heater faces the exposed particleboard, which, to an extent, is fire resistant already. I used a different table, but if you’re still concerned, you can do what I did and add a thin piece of hardboard panel between the heater and table top (it’s pretty straightforward, but here’s the guide I wrote if it helps: https://japanesefutonzen.com/diy-kotatsu/).

    Can’t comment yet if it has saved me money on my utility bill. We’ll see next month 🙂

    Hope this helps others, and thanks for the inspiration!

  • Ethel April 20, 2016, 10:30 pm

    I love all this creative idea! I might need to try this in my apartment. Hope it works also.

  • Martin April 18, 2016, 4:57 am

    Hi Joe,

    thanks for this neat guide. Will try my way with it, will need to do a few adaptions though due to different electricity standards here in Europe but your article defintely helps.

    Building them yourself is just the better option compared to importing it.


  • kachun November 14, 2015, 7:34 pm

    I just bought a Kotatsu heater from Rakuten. The heater itself is ~$16 usd plus ~$35 shipping. The unit arrived in one week. It works fine. My house temperature is around 65 degree, but I feel very cozy under the table with my short. There is only one problem. The top part of the heater can get pretty hot. I may be completely wrong, but I think it’s better to leave some space between the heater and the table when you install it on a Ikea table.

  • Lin November 13, 2015, 8:52 am

    Thanks for this great article! Though I am aiming to retire by 40 and really love the blog for the personal finance tips, I’m pretty sure this was the first article I read. I constructed a kotatsu and it has been fantastic! I’m not really sure whether it has saved us much money, as all three of my roommates tend to favor more heating than I do in winter. But I compromise a bit because they’re all awesome.

    When I lived in Japan, the kotatsu was wonderful as a center of family life. But yeah, the insulation was pretty terrible. It was amazing how warm and cuddly you could be, though, just by taking a super hot bath, having some kotatsu time, then snuggling up underneath a bunch of blankets. I am going back for a visit this winter and can’t wait!

  • Matt November 9, 2015, 4:16 pm

    Looks like a great way to stay warm and to have the family all spend more time together huddled around the table!!

  • Jason Fieber November 9, 2015, 1:50 pm


    Interesting stuff. Never heard of it before, but that’s pretty unique. I know it can get pretty cool/wet there in Portland for more than half the year, so it’s awesome you guys found a way to reduce the heating expenses down somewhat.

    “Happy building! How do you keep your heating bill down?”

    My answer to that question is living in a tropical climate. Practically no heating bills here in Florida. Keeping the A/C near almost 80 year round means it’s pretty comfortable in the apartment with minimal HVAC expenses. I think we spent like $75 on electricity last month. Works for me. 🙂


    • retirebyforty November 9, 2015, 10:03 pm

      It’s cold in the winter, but not bad in the spring and fall. I think you would be able to handle it. The people with the most problem are stuck in the office from 9 to 5. It’s not so bad when you can be outside once in a while.
      I like your answer. I’m sure I’ll end up in a tropical zone eventually.

  • Stockbeard November 9, 2015, 12:06 pm

    “Most Japanese housing are not insulated well and the kotatsu table is an inexpensive way to stay warm.”

    This sums it up. Having lived in Japan for 9 years I can say that Japan is generally clueless about insulation, and the Kotatsu is the “poor man’s” answer to a bigger problem I’m pretty sure it’s inefficient if you look at the overall numbers, unless you like to have your house freezing cold except for a 1sq meter area. If you really have a problem with heat in your house, the real solution is to improve insulation and fix your central heating.

    A Kotatsu in itself is great, but good luck when you want to start working on your computer at your desk, because then you’ll be freezing.

    Our Electricity bill was twice as big in Japan as it is in the US, by the way ( http://howtoretireearly.net/a-comparison-of-the-cost-of-living-in-japan-and-the-us/ ). Terrible insulation does that to you.

    The kotatsu itself is a nice piece of appliance, but it’s sad that it is considered as the “right” solution to heating expenses, when it clearly is not.

    Great DIY post, nonetheless!

    • retirebyforty November 9, 2015, 10:00 pm

      You’re right. The real solution is to improve the insulation. Our building is very well insulated and we get radiant heat from the units around us. Thanks for the link. It’s interesting to see the cost of living comparison. I’d love to live in Japan for a while.

  • MIKE November 9, 2015, 7:52 am

    hi Joe:

    wow, your indoor temperature is 64 degrees. That is amazing your kid and wife are ok at that temperature. For me at 68 degrees I already feel cold. We usually set ours around 69 to 70. and I thought that was being really economical. But still my gas bill is around $300 or so in the worst of winter. I also live in Portland.

    I have learned that by bundling up with extra layers of clothing. I usually have about three layers. That does the trick for and it works better for me though.
    I don’t feel as cold, and I don’t need to set the heat so high.

    Just a suggestion…

    My family needs at least a minimum of 68. especially my mom when she comes over to visit.

    • retirebyforty November 9, 2015, 10:15 am

      That’s whey we spent so much time under the kotatsu table… Actually, I have been turning it up the last few years. The 64 degree was in 2010. I usually keep it at 68 now. 🙂

  • Justin November 9, 2015, 6:43 am

    This would be perfect for Mrs. Root of Good. I like it cold but this thing could keep her (and the kids!) warm.

    I’d just be concerned about the kids knocking it over and starting a fire.

    • retirebyforty November 9, 2015, 10:14 am

      Once you attached the heating element to the coffee table, it’s pretty much impossible to knock it over. You should try it.

  • Pennypincher November 9, 2015, 1:25 am

    I’m with Mrs. RB40 on always feeling cold. Best tips are-wear several layers around the house. Now thermal base layers (thermal underwear) is made from polar fleece. This fabric is made from plastic (soda bottles!) and is one of the warmest. A few layers of clothing makes a huge difference. Wear a hat from this fabric (or wool) around the house, who cares what you look like! And sox, especially w/a bit of wool, like 5-10% makes a huge difference.
    I read that thermal window covers are one of the most effective ways to keep heat in, cold out. You could switch them out in the summer months.
    Fleece and down comforters are on all chairs and the sofa for use. The dogs even have their own.
    My best find lately is a small heater, the size of a shoebox, for $10 from Walmart. It is not recommended for bathrooms, but I’m super careful w/it and that’s exactly where I use it! Heats up in seconds for when you step out of the bath or shower, instead of heating up the whole house. It’s also cool to the touch. As long as you follow the instructions in the manual, this little heater is fantastic. The polar fleece thermal base layers are from Walmart too. Save your hard earned cash for more important things-like tropical vacations!

  • Khen Elazar November 9, 2015, 1:05 am

    I wouldn’t try to save money on the heating element. I would buy a reliable element. You can probably buy from Ebay and AliExpress cheap elements, but you should look for a higher standart elements.

  • Ernie Zelinski November 9, 2015, 12:43 am

    “How do you keep your heating bill down?”

    I don’t do much except close the heat vents in the rooms downstairs that I don’t use and open the drapes fully when the sun is shining through by south windows. Having said that, if it gets too cool for me I turn the heat up. When I was younger, I used to turn down the heat at night so much that when I woke up in the morning it was so cold I could see my breath. Not so anymore. That’s craziness. I am too prosperous to that anymore.

    Coincidentally, for anyone interested, in the last five minutes I came across this article about 9 Sneaky Ways to Cut Down the Heat Bills in Your Home:


    • retirebyforty November 9, 2015, 10:02 am

      I’m glad it doesn’t get that cold around here. 🙂 It’s amazing what we could handle when we were young. Thanks for the article. There are some easy tips there.

  • Suzanne December 10, 2014, 9:50 pm

    We don’t have a kotatsu but we do use yutampo (Japanese hot water bottle) to warm our beds here in Japan. Yutampo is far better for one’s health — than an electric blanket, for example. One winter we went skiing in the Japanese alps at Nagano and the Inn had kotatsu for each room but no heating. So we were forced to sleep under the kotatsu — a bit dangerous in my opinion due to fire potential and health reasons, however, it was preferable to freezing to death those nights!

    Our homes here have electric flooring but it is too expensive to use often and I object to it for health reasons, as with the electric blanket or electric heating pad for pets. Electric ‘hot carpets’ are also popular here, but again, I do not think it is wise to expose one’s body to electrical current all winter long.

    • retirebyforty December 11, 2014, 10:09 am

      The Yutampo is a great idea. I will keep a look out for it. Mrs. RB40 uses a heat pack thing she warms up in the microwave. That works pretty well too, but it doesn’t last long.

  • Mary March 25, 2014, 6:43 pm

    I think an electric heating blanket might work here too.

  • Gerard June 21, 2013, 10:18 am

    I wonder if you could get the heat from a dog bed heater instead of the heater you show in the picture. They’re cheaper and they look like they don’t use much power, or overheat.

  • Steve January 25, 2012, 2:30 pm

    How do you use the table? When you “spend a lot of time under the kotatsu table” are you literally under the table, like it’s a kid’s fort? Or do you just stick your legs under there? Does it provide warmth if you’re just sitting next to it, or if you’re sitting on a couch and maybe just putting your feet underneath?

    • retirebyforty January 25, 2012, 2:52 pm

      It’s best to sit on the floor and stick your legs under the table then pull the blanket over your waist. It works great and warm your whole lower body!
      You can sit on the couch and stick your feet underneath too, but it is not as warm then. Sitting next to it is no good.

  • Hank November 10, 2011, 9:40 am

    This is a very interesting idea. I had never even heard of a kotatsu table before.

    • retirebyforty November 10, 2011, 12:59 pm

      It works very well and saved us a lot of money on the power bill.

  • catawba county nc real estate November 10, 2011, 7:22 am

    Great idea! This is a great solution to staying warm in the winter without paying an expensive power bill. Thanks for sharing!

    • retirebyforty November 10, 2011, 12:58 pm

      It’s really great, we love it.

  • Paula @ AffordAnything.org November 8, 2011, 9:27 pm

    That’s fantastic! It’s great to read an actual unique tip like this — not just the same ol’, same ‘ol. And I marvel at the Japanese; they have great design and efficiency.

    • retirebyforty November 9, 2011, 10:25 am

      We love our Kotatsu table. It’s the best spot to gather in the winter.

  • 101 Centavos November 8, 2011, 7:56 pm

    I’m not much of a floor sitter, but I think for warm legs on a cold night, I could adapt.

    • retirebyforty November 9, 2011, 10:26 am

      I was already sitting on the floor playing video games and such so it was an easy adjustment for me. 🙂

  • Melissa November 8, 2011, 7:35 pm

    I love these! My husband’s parents still live in Japan, and their house gets very cold. These were wonderful; the whole family sits around it!

  • [email protected] November 8, 2011, 6:46 am

    This is a neat little tip. We all like to cozy up next to the fireplace. Now we can also cozy up to a coffee table 🙂

    • retirebyforty November 8, 2011, 11:06 am

      A coffee table is much nicer to cozy up to than a fireplace. There is a spot to put your coffee, magazines, and laptop. 😉

  • Kellen November 8, 2011, 6:44 am

    Sometimes it’s cozier to have a warm spot like this than to heat the whole house – like how nice it is to snuggle under blankets when it’s cold. If the whole house is heated, then most of that warm air is not being used, PLUS can make all the air in the house even drier than winter air usually is.

    Thanks for the tips on making your own!

    • retirebyforty November 8, 2011, 11:06 am

      In our old house, we warmed the bedroom at night with a space heater and use the kotatsu table in the living room. The room temp was around low 60s and it worked quite well.

  • SB @ One Cent At A Time November 7, 2011, 7:08 pm

    This is great. But nothing beats a thermostat and a one click heating 🙂 Unless you are counting pennies

  • Aloysa November 7, 2011, 6:34 pm

    I remember this article! It was great then, it is great now! I also remember thinking wow! Never even heard about this table. 🙂

  • Roshawn @ Watson Inc November 7, 2011, 5:42 pm

    It does look really nice. I intially had the same question as Little House though.

    I think it is always good to rethink conventional wisdom, and since your November heating bill was only $10 more than the summer, that’s speaks volumes.

  • Jeff @ Sustainable life blog November 7, 2011, 12:46 pm

    That’s a really creative idea and I love DIY projects, but I may be too tall for this one!

  • Miss T @ Prairie Eco-Thrifter November 7, 2011, 8:29 am

    This looks really neat. Not only on a functional level but they look really nice in a room too. Plus I love the name. It just sounds warm and cozy. I might just have to look into one of these.

    • retirebyforty November 7, 2011, 10:08 am

      It’s quite expensive to import one from Japan. If you live in LA, there are some stores that sell a ready made one starting at $150 or so.

      • Miss T @ Prairie Eco-Thrifter November 8, 2011, 6:22 am

        Good to know. Thanks. Looks like I will need to import either way if I want one since I live in Canada.

      • Jarrod May 31, 2012, 6:14 pm

        I live in LA and would love to buy on for my fiance who lived in Japan for two years. Where can I buy them in LA for the $150?

        • retirebyforty May 31, 2012, 8:52 pm

          We got one from Murakai market. Not sure how much it cost now.

  • MoneyCone November 7, 2011, 8:11 am

    I remember reading that post last year! The Kotatsu table sounds fantastic!

    • David @ VapeHabitat July 26, 2018, 9:15 am

      I have never heard about Kotatsu tables before. And now i definitely want to buy one for my summer cottage house.

  • PKamp3 November 7, 2011, 7:41 am

    We have a sun-room (other areas of the country might call them three-season rooms) and it’s gotten pretty cold at night the last month or so. We were looking at a cheap way to heat it since if we leave the door open the thin walls will radiate all of our heat away, haha.

    How hot does a kotatsu get? Is it so hot I have to be careful what type of wood I purchase on the table? Think it would be good in a 14×15 sun-room with tile floors… or is it the space heater for us?

    • retirebyforty November 7, 2011, 10:07 am

      My heater element is pretty hot, but I don’t think it can reach wood’s combustion point. The LACK table is made of particle boards and I haven’t had any problem yet. I don’t know about sitting on tile floors. It doesn’t sound comfortable…

  • Little House November 7, 2011, 6:54 am

    Those tables sound really great on a cold day. However, on the DIY version, how do you make sure the heater doesn’t catch the table on fire? I’m a stickler about fire safety (my step-dad was a fireman).

    • retirebyforty November 7, 2011, 10:04 am

      I try my best to not leave it on when I’m not using it. If your legs are next to the heater, you’d know when it gets too hot. From what I understand, the ceramic heater element is not supposed to catch fire, but the risk is always there with any electronic heater.

      • joedartjr September 22, 2013, 8:03 pm

        An authentic kotatsu heater does not heat up like a space heater, it wont light the wood on fire. But it is possible if the blanket isn’t flame retardant that if someone was to physically put it into the heater and hold it there it could catch on fire, but you would have to purposefully do it.

    • Ramona @ Personal Finance Today November 18, 2018, 4:27 am

      My worry exactly. All my heating appliances come with warnings NOT to get them covered at all. I assume that, if done right, the table can be safe (and also, if not left unattended).

      To answer the main question: we don’t make efforts to reduce our heating bill. We come from 30 years of Communism here and I still remember, as kid, how cold the apartment was, because we’d get heat few hours a day (same with warm water, it was never too hot anyway :)).

      I have an aversion to cold, so we crank up the heating system and enjoy it. We all wear t-shirts during winter at home and there’s no one that could convince me to go through any more day in cold at home, even if it meant I’d save money for a space rocket 😀

  • Jack Fuller November 7, 2011, 2:07 am

    Wow. A unique way of staying warm this winter.

    • retirebyforty November 8, 2011, 7:37 pm

      Heh heh, thanks. I was getting tired of the usual advice to turn down the thermostat.

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