JPHEAT editors (Kawaguchi Seiken Co., Ltd.) / Updated 2026-11-15
First, decide by place.
On bedding, a heated mattress pad; on the floor, a hot carpet. The pad goes on a futon or mattress with the sheet over it, so it does not touch the skin directly. A hot carpet is spread on a hard, flat floor where you sit or rest your feet.
A hot carpet cannot be used on a bed, a sofa or anything soft that sinks. Do not sleep or doze on a hot carpet.
Check the area in cm.
Hot carpet sizes are sometimes given in tatami mats, such as “1.5 jō”, but a tatami mat differs by region and home, so check in cm. The sizes of the JPHEAT models and where each is used:
- Heated mattress pad Single JPT100J: about 190×100 cm. Full body, for a single futon.
- Heated mattress pad Half JPT7080J: about 70×80 cm. For part of the bedding, such as the back, hips or feet.
- Hot carpet JPT5060: 50×60 cm. Under the desk or at your feet.
- Hot carpet JPT60100: 60×100 cm. One person’s seat, or the feet in front of a sofa or chair.
- Hot carpet JPT16060: 160×60 cm. Long, along the front of a sofa.
- Hot carpet JPT200120: 200×120 cm (about 1.5 tatami). The living room.
Check the power supply.
JPHEAT heated mattress pads run on low-voltage DC 24 V through the supplied adapter (input AC 100–240 V), plugged into a household outlet (AC 100 V in Japan). The hot carpets for Japan are AC 100 V models.
Specifications and sales pages differ by region: the hot carpets for Taiwan are AC 110 V and those for Hong Kong and Macau AC 220 V, for example. Check the page for your region.
Temperature and 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 hot carpets the off timer is preset to about 8 hours.
Use the off timer when using a pad at bedtime, and switch the unit off when not in use.
Start low, use safely.
Start at a lower temperature and find the one that suits you. As a guide, 38 °C for hot carpets, and 30–38 °C for long use of a heated mattress pad. Long contact with the same spot can cause low-temperature burns. When small children, older people or anyone less sensitive to heat use it, stay close by.
Insulation and care.
Some hot carpets ask you to lay an insulation sheet underneath. JPHEAT hot carpets have an insulation layer built into the back, so no separate sheet is needed. The surface is splash-resistant PVC, but not waterproof, so it cannot be washed in water.
The pads cannot be machine-washed either. For both, switch off, unplug, and wipe with a well-wrung cloth. Fold a pad for storage only after it has cooled.
Questions and answers
How do I choose between a heated mattress pad and a hot carpet?
On bedding, under the sheet: a heated mattress pad. Spread on the floor where you sit or rest your feet: a hot carpet. A hot carpet cannot be used on a bed or sofa, and you should not sleep on it.
How does an electric blanket differ from a heated mattress pad?
Electric blankets come in two kinds: ones that go over you and ones laid under you. A heated mattress pad is the kind laid under you, on a futon or mattress with the sheet over it.
What size hot carpet suits one person?
For under the desk or the feet only, 50×60 cm; to warm one person sitting on the floor, 60×100 cm.
What size suits the front of a sofa?
Laid long along the sofa, 160×60 cm; covering the area from the sofa to the coffee table, 200×120 cm (about 1.5 tatami). Measure the sofa width and the depth where your feet go first.
How are the heated mattress pads powered?
The pad runs on low-voltage DC 24 V through the supplied adapter (input AC 100–240 V) plugged into a household outlet. The hot carpets are made in different voltages for each region.
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 hot carpets the off timer is preset to about 8 hours. Switch it off when not in use.
Does a hot carpet need an insulation sheet?
JPHEAT hot carpets have an insulation layer built into the back, so no separate insulation sheet is needed. Use them on a hard, flat floor.
Based on JPHEAT product specifications and manuals, and on public sources.