JPHEAT editors (Kawaguchi Seiken Co., Ltd.) / Updated 15 Nov 2026
Start with the place.
On the bed, an underblanket; on the floor, a heated carpet. The underblanket goes on the mattress with the sheet over it, so it does not touch you directly. A heated carpet is spread on a hard, flat floor where you sit or rest your feet.
A heated carpet cannot be used on a bed, a sofa or anything soft that sinks. Do not lie down to rest on a heated carpet.
Check the area in cm.
Carpet sizes are sometimes given in tatami mats, but a tatami mat differs by region, so check in cm. The sizes, uses and Hong Kong prices of the JPHEAT models:
- Underblanket, single, JPT100J: about 190 × 100 cm, full length, for a single bed, HK$1,650
- Underblanket, half-size, JPT7080J: about 70 × 80 cm, for the upper body, the middle or the foot end, HK$1,050
- Heated carpet JPT5060: 50 × 60 cm, under the desk or at your feet, HK$698
- Heated carpet JPT60100: 60 × 100 cm, one person’s seat, or for the feet in front of a sofa or chair, HK$1,050
- Heated carpet JPT16060: 160 × 60 cm, laid lengthwise in front of a sofa, HK$1,380
- Heated carpet JPT200120: 200 × 120 cm, the living room, HK$3,500
Every price includes delivery by SF Express to Hong Kong and Macau.
Check the voltage and plug.
JPHEAT underblankets run on low-voltage DC 24 V: the supplied adaptor (input AC 100–240 V) converts the AC 220 V from a household socket. The heated carpets sold in Hong Kong and Macau are AC 220 V versions. Every product comes with a UK 3-pin plug adaptor, so nothing else is needed.
Specifications differ by region: the heated carpets sold in Japan, for example, are AC 100 V versions. Go by the specifications on the Hong Kong pages.
Temperature and off timer.
Every JPHEAT model sets the temperature from 20 to 50 °C, 1 °C per press. The off timer runs 1–12 hours; setting it to 00 cancels the timer, and the unit stays on until you switch it off. On the heated carpets the timer is factory-set to about 8 hours.
The underblankets' display shows the set temperature; the heated carpets' display shows the carpet's current surface temperature, which can stay below the setting depending on the room and the floor.
Use the off timer when you use an underblanket at night, and switch the unit off when it is not in use.
Begin at a lower setting.
Begin at a lower temperature and find the one that suits you. As a guide, 38 °C for heated carpets, and 30–38 °C for long use of an underblanket. Long contact with one spot can cause low-temperature burns. When young children, older people or anyone who finds heat hard to sense use it, stay close by.
Insulation and care.
Some heated carpets need an insulating underlay. JPHEAT heated carpets have insulation built into the base, so no separate underlay is needed. The PVC top repels everyday splashes but is not waterproof, so it cannot be washed in water.
The underblankets cannot be machine-washed either. For both, switch off, unplug and wipe with a well-wrung cloth. Fold an underblanket for storage once it has cooled.
Ordering in Hong Kong and Macau.
Orders leave our Asia-Pacific warehouse (Shanghai, China) by SF Express within 3 working days of confirmation and arrive in about 5–7 days. Orders for Hong Kong and Macau cannot be returned for personal reasons; a unit that is faulty on arrival, damaged in transit or sent in error is replaced under our purchase terms (see the legal page). Measure the space before you order.
Questions and answers
How do I choose between an underblanket and a heated carpet?
On the bed, under the sheet: an underblanket. Spread on the floor where you sit or rest your feet: a heated carpet. A heated carpet cannot be used on a bed or sofa, and you should not lie down to rest on it.
Can I put an underblanket over me?
No. A JPHEAT underblanket goes on the mattress under the sheet. Do not put it over you or wrap it around you.
What size heated carpet suits one person?
For under the desk or the feet alone, 50 × 60 cm; for one person sitting on the floor, 60 × 100 cm.
What size suits the front of a sofa?
Laid lengthwise along the sofa, 160 × 60 cm; covering the area from the sofa to the coffee table, 200 × 120 cm. Measure the sofa width and the depth where your feet go.
What about voltage and plugs in Hong Kong?
The underblankets run on DC 24 V through their adaptor (input AC 100–240 V); the heated carpets are AC 220 V versions for Hong Kong and Macau. Every product comes with a UK 3-pin plug adaptor.
What happens if the off timer is set to 00?
The timer is cancelled and the unit stays on until you switch it off. On the heated carpets the timer is factory-set to about 8 hours. Switch it off when it is not in use.
Does a heated carpet need an insulating underlay?
JPHEAT heated carpets have insulation built into the base, so no separate underlay is needed. Use them on a hard, flat floor.