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Short answer: Zojirushi rates the NS-TSC10 at 120 V / 610 W, and the 10-cup NS-TSC18 at 120 V / 820 W. Zojirushi doesn’t publish kWh per cooking cycle, but even if the NS-TSC10 drew its full 610 W for an entire hour, that would be 0.61 kWh, or about 11 cents at the July 2026 US average residential electricity price.
How we compare: every spec in this article comes from official manufacturer specifications and manuals (starting with Zojirushi’s official product page), all listed under Sources below. Cost or usage estimates use the third-party data cited there. We don’t run hands-on tests, and if a spec isn’t published, we say so. Last updated: October 2026.
I live in Japan, where people often check the wattage of a rice cooker before buying, because small apartments tend to have limited circuits.
I haven’t measured this cooker with a power meter. Everything below comes from Zojirushi’s official US product page and the US Energy Information Administration (EIA). The math is simple, so you can redo it with your own electricity rate.
Quick Spec Table
| Spec | Zojirushi NS-TSC10 | Zojirushi NS-TSC18 |
|---|---|---|
| Capacity | Up to 5.5 cups / 1.0 liter | Up to 10 cups / 1.8 liters |
| Electrical rating | 120 V / 610 W | 120 V / 820 W |
| Dimensions (W x D x H) | 10-1/8 x 14 x 8-1/2 in | 11-1/8 x 15 x 9-7/8 in |
| Heating type | Micom (fuzzy logic) | Micom (fuzzy logic) |
| Keep warm | Automatic, extended keep warm, reheating cycle | Automatic, extended keep warm, reheating cycle |
| kWh per cooking cycle | Not listed | Not listed |
| Keep-warm wattage | Not listed | Not listed |
| Standby power | Not listed | Not listed |
| Made in | China | China |
Capacity is measured with Zojirushi’s approx. 180 mL rice measuring cup using raw short-grain white rice.
What “610 Watts” Actually Means
The 610 W figure is the cooker’s electrical rating. It’s the most power the appliance is designed to draw, not the amount it pulls from the moment you press Start until you scoop the rice.
A micom cooker like the NS-TSC10 adjusts its heating as it goes. Zojirushi describes it as using “micro computerized fuzzy logic technology” in which a microcomputer adjusts cooking temperature and time. So actual consumption depends on the menu, the amount of rice, and how long you keep it warm. Zojirushi doesn’t publish those numbers on the product page, so I won’t guess them.
If you want to know how this compares with an induction model, I covered the NS-TSC10 against the 1,230 W NP-HCC10 in NS-TSC10 vs NP-HCC10.
A Worst-Case Cost Ceiling
Since there’s no official kWh figure, the most honest thing I can do is calculate a ceiling: the cost if the cooker ran at its full rating for one hour.
| Step | NS-TSC10 | NS-TSC18 |
|---|---|---|
| Rated power | 610 W | 820 W |
| Energy if run at full rating for 1 hour | 0.61 kWh | 0.82 kWh |
| US average residential price, July 2026 (EIA) | 18.31 cents/kWh | 18.31 cents/kWh |
| Ceiling cost for that hour | About 11 cents | About 15 cents |
That’s not a prediction of your bill. It’s an upper bound for one hour at full power. Real cooking cycles are likely to draw less on average because the heater doesn’t run at full power the whole time, but Zojirushi doesn’t publish a figure to confirm by how much.
Keep warm is a separate question. Zojirushi lists automatic keep warm, extended keep warm, and a reheating cycle, but no keep-warm wattage. If you leave rice on keep warm all day, that adds to your use in a way I can’t put a number on from official data.
Do your own math: watts / 1,000 x hours x your rate in dollars per kWh = cost. Your utility bill shows your rate. A plug-in power meter will give you real numbers for your kitchen.
Breakers and Shared Circuits
The more practical reason to look at wattage is circuit load. A 610 W rice cooker is modest by kitchen-appliance standards. For comparison, Zojirushi’s own pages list the NP-HCC10 induction cooker at 1,230 W and the CD-NAC40 water boiler at 800 W.
If you plan to run a rice cooker and a hot water dispenser on the same counter, the totals add up. I compared two Zojirushi water boilers in CD-NAC40 vs CV-JAC40 if you’re shopping for both.
Who Should Pick Which?
Choose the NS-TSC10 if you:
- Cook for about one to three people (see how much rice a 5.5-cup cooker makes)
- Want the lower rating of the two (610 W)
- Have limited counter space
Choose the NS-TSC18 if you:
- Regularly cook more than 5.5 cups of raw rice at once
- Don’t mind the higher 820 W rating and bigger footprint
Not sure about size? I put both side by side in NS-TSC10 vs NS-TSC18.
Wattage on Japanese Spec Sheets
Japanese rice cooker spec sheets go further than the US “610 W” figure. Under Japan’s energy-saving law, Zojirushi Japan lists each model’s cooking wattage plus energy used per cooking cycle (Wh), keep-warm energy per hour (Wh), and estimated yearly kWh. Its NW-FB10 pressure IH, for example, is rated at 1,240 W but lists 151 Wh per cook, 16.5 Wh per hour of keep-warm, and 81.2 kWh per year. Those figures are for a different, Japan-only 100 V model, but they show that rated wattage overstates how much energy a cooking cycle actually uses.
Japanese reviewers on Kakaku.com often praise the NW-FB10’s flavor, gloss and distinct grains, while some call it large and heavy for a 5.5-go cooker; several posts on its discussion board complain that rice kept warm for many hours turns hard or yellowish. (Third-party reviews, not our own testing.)
Zojirushi NS-TSC10 Power Consumption: Frequently Asked Questions
How many watts does the Zojirushi NS-TSC10 use?
Zojirushi lists the electrical rating as 120 volts / 610 watts.
How much electricity does the NS-TSC10 use per cycle?
Not listed. Zojirushi’s product page doesn’t give kWh per cooking cycle.
How much does it cost to run?
There’s no official per-cycle figure. As a ceiling, running at the full 610 W for one hour would use 0.61 kWh, about 11 cents at EIA’s July 2026 US average of 18.31 cents/kWh.
Does keep warm use a lot of power?
Zojirushi doesn’t list keep-warm wattage for this model, so I can’t say from official specs.
Is the 10-cup NS-TSC18 much higher?
It’s rated at 820 W, which is 210 W more than the NS-TSC10.
Will the NS-TSC10 trip my breaker?
That depends on what else is on the circuit. On its own, 610 W is a modest load, but adding a kettle or microwave on the same circuit raises the total.
Related comparisons
- Zojirushi NS-TSC10 vs NS-TSC18: 5.5 or 10 Cups?
- Zojirushi NS-TSC10 vs NP-HCC10: Which Rice Cooker to Buy?
- Zojirushi NS-TSC10 vs NL-AAC10: Which Rice Cooker to Buy?
- TOTO Washlet C5 Power Consumption: Watts and Yearly Cost
Sources
- Zojirushi, Micom Rice Cooker & Warmer NS-TSC10/18 (official product page): https://www.zojirushi.com/app/product/nstsc
- Zojirushi, Induction Heating System Rice Cooker & Warmer NP-HCC10/18 (official product page): https://www.zojirushi.com/app/product/nphcc
- Zojirushi, Micom Water Boiler & Warmer CD-NAC40/50 (official product page): https://www.zojirushi.com/app/product/cdnac
- US EIA, Electric Power Monthly Table 5.6.A (July 2026 prices): https://www.eia.gov/electricity/monthly/epm_table_grapher.php?t=epmt_5_6_a
- Zojirushi Japan: NW-FB pressure IH specs (zojirushi.co.jp): https://www.zojirushi.co.jp/syohin/rice/ricecooker/nw-fb/spec.html
- Zojirushi Japan: 5.5-go and 1-sho rice cooker lineup PDF (zojirushi.co.jp): https://www.zojirushi.co.jp/syohin/pdf/lineup_jar5.pdf
- Kakaku.com user reviews: Zojirushi NW-FB10 (Japanese): https://review.kakaku.com/review/K0001538483/
- Kakaku.com discussion board: Zojirushi NW-FB10 (Japanese): https://bbs.kakaku.com/bbs/K0001538483/
Specs checked October 2026. Prices and availability change, so check the current listing before buying.
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