Maruka Yutanpo

Maruka Co., Ltd., headquartered with manufacturing in Amagasaki, Hyogo, plans, manufactures, and sells yutanpo, leisure goods, and cleaning products. Founded in 1923 and incorporated in 1966, the company has continued making yutanpo for about 100 years. The flagship metal yutanpo is produced entirely in-house at the Amagasaki factory, supporting stable quality. Because it's a tool meant to be used for years, careful manufacturing is the foundation.

The lead role goes to metal yutanpo that can be heated directly. The warmth lasts so long it still feels hot in the morning, and direct heating is possible. Three materials are offered: standard galvanized steel sheet (Z27), rust-resistant stainless steel, and pure copper with excellent thermal conductivity and a premium feel. Beyond direct heat, flat-bottom models designed to transfer IH cooktop heat efficiently have also been developed. The note that some rust is unavoidable with metal products is also clearly disclosed.

For those who want a more casual option, plastic yutanpo are also available. Compared to metal, the warmth lasts less time, but they're light, easy to carry, and affordable. Since they don't rust they're easy to handle, with variations in size and color. Plus, fluffy microfiber covers can be paired — choose from drawstring, full-open zipper, or reversible towel-fabric shapes. Cute lines such as Hello Kitty covers are also available.

Safety behind convenience is given careful attention. Yutanpo are products using hot water, and improper use can lead to low-temperature burns, burns, or rupture incidents. So both metal and plastic yutanpo carry SG Mark certification meeting Consumer Product Safety Association standards. Company info lists four patents and twenty design registrations. Innovations for direct-heat and IH compatibility, pressure-adjusting valve caps for accidental overheating, and internal support pillars resisting denting have also been developed (features vary by product). PDF manuals are also published, so it's reassuring to skim them once before first use.

Founded in 1923 — making yutanpo for about 100 years

Maruka was founded in 1923 and has been making yutanpo from its Amagasaki production base for about 100 years. While accumulating multiple patents and utility model rights, the company has updated usability and safety. The flagship metal yutanpo line is manufactured consistently at the Amagasaki factory, ensuring stable quality.

Three materials for metal yutanpo — direct heat and long-lasting warmth

The defining feature of metal yutanpo is that they can be heated directly. The warmth lasts long enough to still feel hot in the morning, and direct heating is possible. Three materials are available: galvanized steel sheet (Z27), stainless steel, and pure copper. Note: as metal products, some rust over time is unavoidable.

IH-friendly ideas and detailed safety considerations

Beyond direct heat, models with flat bottoms designed for IH cooktop heat transfer are also available. A pressure-adjusting valve cap addresses safety during direct heating, and internal support pillars help resist denting. Subtle improvements add up to greater everyday peace of mind. (Features vary by product.)

Choose the touch with microfiber covers

Yutanpo covers use soft microfiber for a comfortable touch. Three shapes are available: a classic drawstring type, a full-open zipper type for easy storage, and a reversible type with towel-fabric lining. There are also cute options such as Hello Kitty covers.