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Zojirushi SW-LA52H vs SW-KA52H: Which 18 oz Food Jar?

Two short, wide insulated food jars on a wooden table, one stainless and one rose colored, next to a small bowl of soup

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Short answer: For most people, get the Zojirushi SW-LA52H. It is the newer 18 oz food jar, Zojirushi rates it 7°F warmer after 6 hours (160°F vs 153°F), and its manual allows a home dishwasher. The SW-KA52H manual says hand wash only. Both hold 18 oz, weigh 13 oz, have the same 2-7/8 in mouth, and cost $39.99 at Zojirushi’s US store. Pick the SW-KA52H only if you prefer its colors or find it cheaper.

How we compare: every spec in this article comes from official Zojirushi pages and documents (starting with Zojirushi’s SW-LA52H page and SW-KA52H page), all listed under Sources below. We don’t run hands-on tests, and if a spec isn’t published, we say so. Last updated: October 2026.

Check price: Zojirushi SW-LA52H
Check price: Zojirushi SW-KA52H

The SW-KA is the food jar many Zojirushi fans already own. The SW-LA replaced it in Japan in September 2025, and Zojirushi’s US store now sells both side by side at the same price. In the 18 oz size, the two jars are almost the same size and weight, so the real differences are heat retention, cleaning and color.

Quick Comparison Table

Spec Zojirushi SW-LA52H (newer) Zojirushi SW-KA52H
Capacity 18 oz / 0.52 L 18 oz / 0.52 L
Heat retention @ 6 hrs* 160°F (about 71°C) 153°F (about 67°C)
Cold retention @ 6 hrs* 48°F (about 9°C) 48°F (about 9°C)
Dimensions (W x D x H) 3-3/4 x 3-3/4 x 5-3/4 in (about 9.5 x 9.5 x 14.6 cm) 3-7/8 x 3-7/8 x 5-3/4 in (about 9.8 x 9.8 x 14.6 cm)
Weight 0 lb 13 oz (about 369 g) 0 lb 13 oz (about 369 g)
Mouth opening 2-7/8 in (about 7.3 cm) 2-7/8 in (about 7.3 cm)
Heat-keeping design “Thermo-ring” structure near the mouth Lid with built-in insulating chambers
Stopper One-piece stopper, gasket built in One-piece stopper, gasket built in
Dishwasher Yes (manual: home dishwasher OK, hand wash recommended for long life) No (manual: do not use a dishwasher or dish dryer)
Inside finish SlickSteel polished interior (Zojirushi says it resists corrosion and repels stains) 18/8 stainless steel (Zojirushi Japan calls it “Tsuru-tsuru Clear Stainless”)
Colors (Zojirushi US) Stainless, Powdery Pink, Cloud Gray, Ecru Beige Vintage Rose, Ice Gray, Medium Gray
Zojirushi US store price $39.99 $39.99
Warranty 5 years on vacuum insulation 5 years on vacuum insulation
Made in Thailand Thailand

*Zojirushi measures heat retention starting with 203°F (95°C) water and cold retention starting with 40°F (4°C) water, both in a 68°F (20°C) room. Specs, prices and warranty terms are from Zojirushi’s US online store; dishwasher rules are from each model’s English instruction manual. Metric conversions are ours. Zojirushi lists weights in pounds and ounces (0.13 = 0 lb 13 oz). Checked October 2026.

Key differences at a glance

  • Heat retention: The SW-LA52H is rated 160°F after 6 hours, vs 153°F for the SW-KA52H. Cold ratings are the same (48°F).
  • Dishwasher: The SW-LA52H manual allows a home dishwasher. The SW-KA52H manual says not to use one.
  • Design approach: The SW-LA52H uses a “Thermo-ring” structure to cut heat loss at the mouth. The SW-KA52H uses insulating chambers inside the lid.
  • Width: The SW-LA52H is 1/8 in slimmer (3-3/4 vs 3-7/8 in). Height and weight are the same.
  • What stays the same: 18 oz capacity, $39.99 at Zojirushi US, 2-7/8 in mouth, a one-piece stopper with a built-in gasket, a 5-year insulation warranty, and manufacture in Thailand.

1. Heat and Cold Retention

This is the main reason the SW-LA exists. Zojirushi tests both jars the same way, so the numbers compare directly:

  • Hot after 6 hours: 160°F (SW-LA52H) vs 153°F (SW-KA52H)
  • Cold after 6 hours: 48°F vs 48°F

Why does 7°F matter? In its Japanese launch announcement, Zojirushi said 60–70°C (140–158°F) is the usual guideline for soup that is pleasant to eat, and admitted that its smallest SW-KA (0.3 L) dropped below 60°C after 6 hours in its own test. That gap is what the SW-LA was designed to close. In the 18 oz size, both jars are rated above that range on paper, but those ratings start with near-boiling water. Real soup is usually cooler when it goes in, so the SW-LA52H’s extra margin is most useful when you pack lunch early and eat late.

The two jars keep heat in different ways. Zojirushi Japan explains that much of the heat in a vacuum jar escapes through the metal at the mouth, and that the SW-LA’s “Thermo-ring” structure uses a thinner, yet strong, inner wall near the mouth to reduce that loss. Zojirushi describes the SW-KA’s approach as a “Therma Chamber” lid with small chambers inside that limit air movement and heat loss through the top. One detail can confuse shoppers: the US SW-KA52H page still calls it the jar “with the highest heat retention in Zojirushi history,” even though Zojirushi now rates the SW-LA52H higher in the same size.

2. Cleaning and the Dishwasher

Both jars use Zojirushi’s one-piece stopper, with the gasket built into the stopper. In both manuals, the gasket is not removable, so there is no separate ring to pull out, lose or forget. Each lid set is just two parts: the lid and the stopper.

The difference is the dishwasher. The SW-LA52H/75H manual allows a home dishwasher with a few rules: take the lid set apart first, don’t use a commercial dishwasher or a dish dryer, don’t let the lid or stopper fall onto the heating element, and don’t press the jar hard against the rack. It still says “Hand wash is recommended for extended use.” The SW-KA52H/75H manual is simpler: do not boil the jar, and do not use a dishwasher or dish dryer.

Both manuals say not to use bleach or abrasive cleaners, and both suggest hot water with 10% vinegar for 30 minutes to an hour if rust spots appear inside. Zojirushi’s US page calls the SW-LA52H’s inside a “SlickSteel” polished interior. Zojirushi Japan says this finish (ラクリア加工＋) resists corrosion and makes stains easier to wash off.

3. Size, Mouth and Weight

These two jars are almost twins. Both are 5-3/4 inches tall, weigh 13 oz empty and have a 2-7/8 inch (about 7 cm) mouth, wide enough to pour soup in with a ladle. The SW-LA52H is listed as 3-3/4 inches across, vs 3-7/8 inches for the SW-KA52H. That 1/8 inch rarely matters, unless a lunch bag pocket is already tight.

Both jars have a lid designed to release pressure when you open it. The SW-KA52H manual says the jar has a raised maximum fill line inside. The SW-LA52H manual says to fill only to the fill level and leave a bit of space below the rim. Don’t overfill either one, because it can cause leaks and lower the heat rating.

4. Colors and Price

Both are $39.99 at Zojirushi’s US store, and every color of both was in stock when we checked. The SW-LA52H comes in Stainless, Powdery Pink, Cloud Gray and Ecru Beige. The SW-KA52H comes in Vintage Rose, Ice Gray and Medium Gray, with a matte finish. Zojirushi also sells an SW-KA52 (no “H”) in Matte Green or Beige with the same listed specs; when we checked, Beige was in stock and Matte Green was not.

Because the price is the same at Zojirushi, the deciding factor on Amazon is often whichever listing is cheaper that day. If the SW-KA52H is clearly cheaper and you don’t need a dishwasher, it is still a strong 18 oz jar.

5. What Not to Put in Either Jar

The two manuals share the same food-safety rules:

  • Never add dry ice, carbonated drinks, or perishable fresh foods such as uncooked meat, seafood, dairy products or eggs.
  • Cook (heat) cold soups and foods containing dairy all the way through before packing them.
  • Eat the food within 6 hours and finish it in one sitting.
  • Don’t heat the jar in a microwave, and don’t carry it by the lid set.
  • If the lid is hard to open, don’t heat the jar from the outside; open it upright with a rubber glove or other non-slip material.

Other Sizes in Each Line

Model Capacity Height Weight Heat @ 6 hrs* Cold @ 6 hrs* Zojirushi US price
SW-LA30 10 oz / 0.30 L 4-3/8 in 0 lb 11 oz 144°F 50°F $36.99
SW-LA40 14 oz / 0.40 L 5 in 0 lb 12 oz 153°F 48°F $38.99
SW-LA52H 18 oz / 0.52 L 5-3/4 in 0 lb 13 oz 160°F 48°F $39.99
SW-KA52H 18 oz / 0.52 L 5-3/4 in 0 lb 13 oz 153°F 48°F $39.99
SW-LA75H 25 oz / 0.75 L 7-1/4 in 1 lb 0 oz 165°F 48°F $42.99
SW-KA75H 25 oz / 0.75 L 7-1/4 in 0 lb 15 oz 163°F 46°F $42.99

*Same test conditions as above. Specs and prices from Zojirushi’s US online store, October 2026. For smaller jars, see our SW-LA30 vs SW-LA40 comparison and SW-LA40 vs SW-KA40 comparison.

Need more food? The 25 oz SW-LA75H is $42.99. It is 7-1/4 inches tall, weighs 1 lb and is rated 165°F after 6 hours. Check the Zojirushi SW-LA75H on Amazon. The 25 oz SW-KA75H is also $42.99 and is rated 163°F.

Who Should Buy Which?

Choose the Zojirushi SW-LA52H if you:

  • Pack lunch early and eat late, and want the warmer 6-hour rating (160°F)
  • Want to put the jar and lid in a home dishwasher
  • Like Stainless, Powdery Pink, Cloud Gray or Ecru Beige
  • Want the newer design that Zojirushi Japan now sells as its current model

Choose the Zojirushi SW-KA52H if you:

  • Always hand wash anyway
  • Prefer Vintage Rose, Ice Gray or Medium Gray, or a matte finish
  • Find it noticeably cheaper than the SW-LA52H
  • Eat within a few hours, so a 7°F gap after 6 hours won’t matter

A View from Japan

In Japan, these jars are sold as the SW-LA52 and SW-KA52, without the “H.” Zojirushi Japan launched the SW-LA line on September 1, 2025, in 0.3, 0.4 and 0.52 L sizes. In its launch announcement, Zojirushi said that 93% of SW-KA owners in a 2022 survey (1,762 people) were satisfied with its heat and cold retention, but some said they wished it were a little warmer. It then added the Thermo-ring structure and made the jar dishwasher safe, which owners of the hand-wash-only SW-KA could not do.

The Japanese ratings match the US ones: 71°C (160°F) vs 67°C (153°F) after 6 hours, and 9°C (48°F) cold for both. Zojirushi Japan lists both jars at about 9.5 x 9.5 x 14.5 cm, with the SW-LA52 slightly lighter (about 0.34 kg vs 0.36 kg). Zojirushi Japan also sells a matching insulated pouch, the SW-PC, launched in September 2025; its M size is for 0.35–0.55 L jars.

Spec SW-LA52 (Japan) SW-KA52 (Japan)
Launched in Japan September 1, 2025 Earlier model (Zojirushi calls it the “previous model”)
Capacity 0.52 L 0.52 L
Heat @ 6 hrs 71°C (160°F) or above 67°C (153°F) or above
Cold @ 6 hrs 9°C (48°F) or below 9°C (48°F) or below
Size (W x D x H) About 9.5 x 9.5 x 14.5 cm About 9.5 x 9.5 x 14.5 cm
Weight About 0.34 kg About 0.36 kg
Dishwasher Yes, body and lid set No (body fully washable by hand)
Japanese colors Ecru Beige, Cloud Gray Matte Green, Beige
Price Open price; ¥4,378 at Zojirushi Direct ¥7,150 suggested; ¥4,158 at Zojirushi Direct (marked as a special sale)

Japanese specs from Zojirushi Japan (zojirushi.co.jp); prices from Zojirushi Direct, Zojirushi’s official Japanese store, checked October 2026. Zojirushi measures Japanese heat ratings from 95°C water in a 20°C room. Temperature conversions are ours. Japanese and US weights are rounded differently, so small gaps are expected.

Japanese reviewers of the SW-LA52 on Zojirushi Direct most often praise how easy it is to clean, pointing to the dishwasher-safe parts and the small number of pieces. One owner filled it with miso soup with vegetables at 6:20 a.m. and said it was still hot at 12:40 p.m., using Zojirushi’s pouch. Another said it looks compact for a jar that holds a bowl-sized meal. The complaints are specific: one owner with small hands found the lid hard to open and wished it clicked when fully closed, and another wanted a wider mouth to add chunky ingredients. Reviewers of the SW-KA52 also praise its heat retention and easy-to-wash one-piece stopper. One owner said rice porridge packed at 6:30 a.m. was still piping hot at noon after preheating the jar with boiling water. Another took off a star after learning about the usage limits, such as no dairy. (Third-party reviews, not our own testing.)

Zojirushi SW-LA52H vs SW-KA52H: Frequently Asked Questions

Is the Zojirushi SW-LA52H better than the SW-KA52H?

On paper, yes, for most people. At the same $39.99 price, the SW-LA52H is rated 7°F warmer after 6 hours (160°F vs 153°F), and its manual allows a home dishwasher, while the SW-KA52H manual says not to use one. Capacity, height, weight, mouth size and cold rating are the same. Choose the SW-KA52H mainly if you prefer one of its colors (Vintage Rose, Ice Gray or Medium Gray).

Is the Zojirushi SW-KA52H dishwasher safe?

No. Zojirushi’s English manual for the SW-KA52H/75H says not to boil the jar or use a dishwasher or dish dryer, and not to use bleach. Wash it by hand with mild dish soap and a soft sponge. The SW-LA52H manual does allow a home dishwasher (not a commercial one or a dish dryer), though it still says hand washing is recommended for extended use.

How hot does the SW-LA52H keep soup?

Zojirushi rates the SW-LA52H at 160°F (about 71°C) after 6 hours, starting with 203°F (95°C) water in a 68°F (20°C) room. Real food starts cooler than boiling water, so expect lower numbers. Zojirushi Japan cites 60–70°C (140–158°F) as the usual guideline for a good soup-eating temperature.

What is the difference between the SW-KA52 and SW-KA52H?

Zojirushi’s US store lists the same specs for both (18 oz, 153°F after 6 hours, 48°F cold, 0 lb 13 oz). They differ in colors: the SW-KA52 in Matte Green or Beige, the SW-KA52H in Vintage Rose, Ice Gray or Medium Gray. When we checked, the Beige SW-KA52 was in stock and Matte Green was not. Zojirushi doesn’t explain what the H suffix means.

What can’t you put in a Zojirushi food jar?

Both manuals say never to fill the jar with dry ice or carbonated drinks, or with perishable fresh foods such as uncooked meat, seafood, dairy products or eggs. Cold soups and foods containing dairy must be cooked (heated) through first. Don’t heat the jar in a microwave, don’t overfill it, and eat the food within 6 hours.

Is there a bigger version of each jar?

Yes. The 25 oz SW-LA75H and SW-KA75H are both $42.99 at Zojirushi’s US store. Zojirushi rates the SW-LA75H at 165°F after 6 hours and the SW-KA75H at 163°F. The SW-KA75H is 1 oz lighter (15 oz vs 1 lb) and has a slightly better cold rating (46°F vs 48°F).

Is the SW-LA52H sold in Japan?

Not under that exact number. Zojirushi Japan sells the SW-LA52 (0.52 L), launched on September 1, 2025, with the same 6-hour rating of 71°C (160°F) and the same 7 cm mouth. Japan’s SW-LA line stops at 0.52 L; the 25 oz (0.75 L) size appears on Zojirushi’s US store.

Check current listings

Prices and colors change often, and Zojirushi’s food jar model numbers look alike, so check for “LA52H” or “KA52H” and the 18 oz size in the listing before you buy. For the 25 oz version, search for the Zojirushi SW-LA75H.

Check price: Zojirushi SW-LA52H
Check price: Zojirushi SW-KA52H

Sources

Specs checked October 2026. Prices and availability change, so check the current listing before buying.

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