Winter Heating in Japan: Kotatsu, Kerosene and Heat Packs

Many Japanese homes warm the person, not the whole house, and the toolkit ranges from a blanketed table to pocket heat packs.

Published October 19, 2026 at 12:43 AM JST | By Tokyo Paul

Quick answer: Japanese winters are managed with a mix of local heaters and warm clothing instead of whole-house heating. The kotatsu, a low table with a heater under a quilt, is the most iconic. Kerosene stoves, air conditioners used as heaters, electric carpets, hot-water bottles and disposable heat packs called kairo are also common. Ventilation and fire safety matter with all of them.

Heating the person, not the room

Many Japanese homes, especially older ones, are not built with central heating in the Western sense. Instead, people heat the spaces and bodies they are using. A family might gather in one warm room and keep other rooms cooler, and the habit of wearing extra layers indoors is normal in winter. This approach has practical roots. Traditional houses had sliding doors and thin walls, and open-plan heating would have been inefficient.

As homes modernized, newer buildings added better insulation and more efficient equipment, but the habit of local warmth stayed. For visitors, the result is a different sense of comfort. A hot bath, a heated seat and a warm table can feel more satisfying than a uniformly warm room. Energy saving is part of the logic as well. Turning off heaters in empty rooms and focusing warmth where people sit is a long-standing habit, and many households continue it as a matter of routine rather than sacrifice.

The kotatsu

The kotatsu is a low table with a heat source attached underneath and a quilt or blanket draped over the frame. A tabletop covers the quilt, and people sit on the floor or on low chairs with their legs under the cover. The warmth is gentle and the setup invites family members to linger. The heat source in older versions was a charcoal brazier, and modern kotatsu use electric units with adjustable settings. Many families eat meals, watch television or play games around it, and the kotatsu becomes the center of winter life.

Mandarin oranges placed on the table are a classic seasonal pairing. It is wise to avoid sleeping under a kotatsu for long periods, since it can cause dehydration and uneven warmth. Turn it off when leaving the room, and keep it clear of flammable objects. Some modern kotatsu are designed with a built-in light and a flat surface that can be used as an ordinary table in other seasons. In summer, the quilt is removed and the table works as a regular low table, so it earns its space all year round.

Kerosene and gas heaters

Kerosene heaters, known as sekiyu sutobu, have long been a staple in Japanese homes, especially in colder regions. They are portable and give strong warmth, and some have a flat top that can hold a kettle. In certain neighborhoods and rural areas, kerosene is delivered by truck or purchased in containers at gas stations. Gas heaters, either floor-standing or wall-mounted, are also used. In northern regions such as Hokkaido, many homes use central systems that circulate warm air or hot water.

Safety is essential. Ventilate the room regularly when using combustion heaters, as exhaust gases can be harmful. Follow the manufacturer's instructions for refueling, and never refuel while the heater is hot. Smoke and carbon monoxide detectors give extra protection. In snowy regions, buildings often have extra features such as double windows and entryway porches, which help hold heat. Visitors staying in ski towns may notice drying racks for gloves and boots near the heater, a practical convenience in deep winter.

Air conditioners, carpets and floor heating

Most modern apartments have wall-mounted air conditioners that also work as heaters. They are convenient, though some people find the dry air uncomfortable, and use humidifiers to compensate. Remote controls are often labeled in Japanese, but pictograms for heating, usually a sun symbol or a red setting, make it easy to find. Electric carpets and heated floor mats provide local warmth. Some apartments have floor heating built into the living room, controlled by a wall panel.

Heated toilet seats and warm-water bidets are another small comfort in colder months. Hot-water bottles, called yutanpo, remain popular as a quiet way to warm a futon. Fill them with hot, not boiling, water and use a cover to protect your skin. Warm baths are a central part of winter comfort, and many bathrooms have heated floors or ventilation heaters in newer homes. Stepping into the water after a cold day is a simple pleasure that many residents plan their evenings around.

Pocket heat: kairo

Kairo are disposable heat packs sold in convenience stores, pharmacies and supermarkets. They contain iron powder that heats up when exposed to air. Some are stick-on pads placed on clothing, and others are small pouches held in the hand or tucked into a pocket. They are inexpensive and easy to find from autumn through winter, and many people carry a few during commutes, outdoor events or winter sightseeing. They are also popular with spectators at sporting events and with people who work outside.

Never place a kairo directly on bare skin, since long contact can cause low-temperature burns. Follow the package instructions, and do not use one while sleeping. Dispose of used ones as household waste according to local rules. Variants include foot-warming packs that stick inside shoes and larger pads worn on the lower back. Different sizes last for different lengths of time, usually several hours, and the label tells you what to expect.

Dressing for winter indoors and out

Japanese winter clothing relies on layers. Thermal underwear is a basic starting point, and many shops sell lightweight, warm base layers designed for daily wear. Scarves, wool socks, slippers and fleece garments add warmth at home. Indoors, slippers are common even in heated rooms. Public buildings and trains are often warm, so you may want clothing that is easy to remove. A scarf and a coat that can be taken off prevent overheating.

In snowy regions, waterproof boots and gloves matter. In ryokan and hot-spring towns, provided yukata and haori jackets keep you warm between baths. Ask the staff if you need an extra blanket or heater. Many people wear a haori or a quilted jacket around the house, and a hot drink from a vending machine, often sold warm from a heated compartment, helps on cold walks. These small habits add up to a surprisingly cozy season.

Tips for visitors in cold months

When booking accommodation in winter, check what heating is available. Many hotels have central heating, while guesthouses or traditional inns may rely on room units. Do not hesitate to ask staff how to operate the controls. Bring a small humidifier option, such as a damp towel hung in the room, if you are sensitive to dry air. Drink water, and use lip balm and hand cream. A hot bath, whether in a hotel tub or an onsen, is a classic way to warm up.

Plan for temperature changes. Stepping from a warm train into cold street air can be a shock. Dress in layers and keep a heat pack in your pocket for comfort. Winter is also an excellent time for hot-spring towns, where outdoor baths give a lovely contrast between warm water and cold air. Rest after bathing, and keep warm until your skin cools down to avoid catching a chill.

Frequently Asked Questions

What is a kotatsu?

A kotatsu is a low table with a built-in heater and a quilt around it. People sit with their legs under the quilt, which keeps them warm while eating, relaxing or studying. It is a symbol of Japanese winter home life. Because the quilt traps heat around the legs, it feels warm even when the room is cool.

Are kairo safe to use?

Yes, when used according to instructions. Avoid placing them directly on skin, never sleep with one, and do not use them with very tight clothing. Check the package for guidance on use and disposal. Sold in convenience stores and pharmacies from autumn, they last for several hours, and the packet explains temperature range, which makes them simple to choose.

Do Japanese homes have central heating?

Some do, especially in northern regions and new buildings, but many homes rely on local heaters such as air conditioners, kerosene stoves and kotatsu. As a result, warmth is concentrated in the rooms in use. Newer houses and apartments often have better insulation and efficient heat pumps, but a family still tends to gather in one warm room during winter evenings.

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