Korea Winter Heating Bills for International Students in Studio Apartments: Why Costs Rise Despite Seoul's Residential Gas Rate Freeze, 20℃ Tips, Frozen Pipes, Gas Leaks and Repairs

When winter comes, gas bills for international students living in studio apartments can rise sharply. Seoul's residential city gas rate was frozen in the adjustment on November 1, 2026. It stays at about $0.0168 (KRW 22.5268) per MJ. The unit price is unchanged, but in winter, when heating use is heavy, consumption goes up and so does the bill. When a cold wave hits, problems such as frozen and burst water meters, boiler breakdowns and gas leaks can also occur.

This article lays out how gas and electricity bills are calculated, the government's recommended tips for saving on heating, the reality of the support international students can receive, how to deal with frozen pipes and gas accidents, and the Civil Act provisions on repairs. Amounts are given in U.S. dollars first, with Korean won in parentheses (Hana Bank base exchange rate on November 3, 2026, $1 = KRW 1,341.10).

Gas bills are the basic charge plus the usage charge

City gas bills are divided into a basic charge paid every month and a usage charge based on how much you use. Usage is measured in MJ (megajoules), a unit of heat energy. In Seoul, the residential basic charge is about $0.93 (KRW 1,250) per household per month.

The usage charge unit price is the sum of two parts. One is the wholesale rate at which Korea Gas Corporation (KOGAS) sells gas to city gas companies nationwide. The other is the retail rate (supply cost) collected by the local city gas company. Seoul's residential rates as of November 1, 2026, are as follows.

The wholesale rate is the sum of a raw material cost of about $0.0132 (KRW 17.712) and a KOGAS supply cost of about $0.00234 (KRW 3.1375).

These figures are for Seoul. Retail rates differ by city and province, so unit prices and basic charges may be different in other regions. Check the rate table of the city gas company in your area.

In the November adjustment, rates for commercial and industrial use, among others, went up, but the residential rate stayed the same. Seoul's residential unit price is the same regardless of season. Only some uses, such as air-conditioning for cooling and heating, have separate unit prices for winter, summer and other months. Winter bills run high because of consumption, not the unit price.

Here is how the math works. If you use 1,000MJ a month in Seoul, the usage charge is about $16.8 (KRW 22,527). Adding the basic charge brings it to about $17.7 (KRW 23,777). If you turn up the heat and use 2,000MJ, the total rises to about $34.5 (KRW 46,304) including the basic charge. These figures are calculated from the rate-table unit prices alone. Actual bills may include value-added tax and other charges.

Electric heaters and heated mats: mind the progressive tariff

Many students use electric heaters or electric heated mats instead of a boiler. Residential electricity rates have been run on a progressive tariff, under which the price per kWh rises the more you use. At the time of the government's 2018 announcement, there were three tiers: up to 200kWh was tier 1, 201–400kWh was tier 2, and over 400kWh was tier 3. In 2018, the summer (July–August) brackets were also temporarily widened.

Check the 2026 unit prices and basic charges for each tier, and which tier your usage falls into, on your electricity bill or in Korea Electric Power Corporation (KEPCO) guidance. Leaving electric heaters on for long periods can push your usage into the next tier and raise the unit price.

Small habits can also save electricity. Turning an electric mat down by just one setting, from 'high' to 'low', cuts use by about 16.7kWh a month. That is about $1.3 (KRW 1,760) (Ministry of Trade, Industry and Energy and Korea Energy Agency, 2023 data).

There is also a reward for saving electricity in the second half of this year. The Ministry of Climate, Energy and Environment lowered the threshold for residential energy cashback for July–December 2026. Households that cut electricity use by 1% or more compared with the average for the same month over the previous two years receive a payment based on the amount saved. The previous threshold was 3%. The payment is deducted from the next month's electricity bill. Sign-ups and inquiries are handled on the residential energy cashback website (KEPCO Energy Marketplace). This threshold applies only through December 2026. Check detailed participation conditions with KEPCO.

Government-recommended tips to cut heating costs

The Ministry of Climate, Energy and Environment launched a winter energy-saving campaign last winter, on December 2, 2025. Its centerpiece is keeping indoor heating at 20℃. By the ministry's estimate, sticking to 20℃ saves each household about $3.84 (KRW 5,150) a month. Wearing warm clothing such as thermal underwear saves about $7.7 (KRW 10,300).

The Korea Energy Agency recommends 18–20℃. That assumes you wear thermal underwear along with indoor clothing. Lowering the indoor temperature by 1℃ reduces city gas use by about 7% (Ministry of Government Legislation, 2024 data). With a monthly usage charge of about $16.8 (KRW 22,527), as in the earlier example, that works out to paying about $1.18 (KRW 1,577) less.

The government recommends the following everyday habits.

• Keep indoor humidity at 40–60%. A humidifier helps.
• Attach insulating bubble wrap to the inside of windows.
• Close room doors and the front door to keep warm air from escaping.
• When going out, set the boiler to away mode. The Korea Energy Agency advises using away mode in well-insulated homes.
• Set hot water for washing to 40–50℃.
• After using water, turn the faucet handle to the cold side.
• Clean the boiler regularly.

Energy vouchers, gas bill reductions, cashback: do international students qualify?

There are several programs that help with heating costs. But for most ordinary international students, qualifying is difficult.

For 2026, energy vouchers are available to some recipients of livelihood, medical, housing or education benefits under the National Basic Living Security Act. The recipient or a household member must be an elderly person, an infant or young child, a person with a disability, a pregnant or postpartum woman, a person with a serious illness, a single parent, a child-headed household or a multi-child family. Applications are open until December 31, 2026, and vouchers can be used until May 31, 2027. A single-person household receives about $220 (KRW 295,200) a year.

The problem is recipient eligibility. A foreign national can become a basic livelihood security beneficiary only if they fall under Article 5-2 of the National Basic Living Security Act. It covers foreign nationals married to Korean citizens. Among them, it applies to those prescribed by Presidential Decree who are pregnant or whose spouse is pregnant, who are raising a minor child of Korean nationality, or who share a livelihood or residence with a lineal ascendant of their spouse who holds Korean nationality. For this reason, it is difficult for ordinary international students (D-2, D-4) to become recipients. It is also difficult for them to qualify for energy vouchers, which require recipient status. Confirm exact eligibility at a community service center or the energy voucher hotline (1600-3190).

Korea Gas Corporation's city gas bill reduction is similar. It covers people with severe disabilities, persons of national merit, independence patriots, basic livelihood benefit recipients, the near-poverty group and multi-child households. The reduction applies only to the usage charge, not the basic charge. Applications can be made through the city gas company for your address, an administrative welfare center, Government24 or Bokjiro. Foreign nationals with disabilities submit an alien registration card or a domestic residence report card as documentation. There are almost no categories that ordinary international students fall under.

The city gas savings cashback refunds money to households that cut residential gas use in winter (December through March of the following year) by 3% or more compared with the previous year. It has refunded up to about $0.15 (KRW 200) per m³. Payments for winter 2025 were completed on September 11, 2026. As of November 8, the cashback website has no notice about the 2026–27 winter season. Check whether it will run with the cashback customer center (1522-2011) or through notices on the website.

When a cold wave hits: preventing frozen water meters

Cold wave alerts are issued based on morning low temperatures. Typically, a cold wave advisory is issued when lows of -12℃ or below are expected to last two days or more, and a cold wave warning when lows of -15℃ or below last two days or more. The Korea Meteorological Administration also considers other criteria, such as sudden temperature drops.

Last winter (2025–26), the Seoul Metropolitan Government issued frozen water meter forecasts in four levels, attention, caution, alert and serious, based on the daily low temperature. The criteria and actions for the main levels were as follows.

At the caution level, recheck the insulation of the meter, exposed pipes and the boiler. When leaving water running, open the bathtub faucet slightly so a little water flows. Fill the inside of the meter box with old clothes or similar material and seal the outside with tape.

When you will be away from home for a long time, run the boiler's hot water on low so it drips one drop at a time. Students going home over winter break should take care of this before leaving the country.

If the meter has already frozen, thaw it slowly, starting with a warm damp towel or lukewarm water. Pouring hot water of 50℃ or above can cause heat damage to the meter, which may then need to be replaced.

If a water meter freezes and bursts in Seoul, report it to the 120 Dasan Call Center or the local waterworks office. The Seoul Metropolitan Government's winter safety website lists the districts covered by its eight waterworks offices and their phone numbers. In other regions, contact the city or county waterworks headquarters or waterworks office.

If you smell gas or have a headache

If you smell gas, take the following steps in order.

1. Close the appliance cock and the middle valve. For city gas, close the valve attached to the meter; for cylinder gas such as LPG, close the cylinder valve.
2. Open windows and doors to ventilate thoroughly.
3. Keep away from flames and never touch electrical appliances.
4. Use the gas again only after it has been inspected by your gas supplier.

In an emergency, such as a fire or an injury, call 119.

Also beware of carbon monoxide poisoning from boilers. Clear the area around the boiler before turning it on. Always keep the boiler room vent open. Install a carbon monoxide alarm indoors. If smoke, flames or strange noises occur during use, have it inspected by a professional before using it again. If you have symptoms suggesting poisoning, such as headache or vomiting, go to a hospital immediately.

Before turning on a gas boiler, also check the exhaust pipe (flue). Make sure it has not come loose and has no dented sections. Also check that it is not blocked by built-up debris and has no holes. If overheating, noise, vibration or smells seem different from usual, turn off the power and have it inspected by a professional.

Electric heaters have their own rules. Do not leave an electric heater on and walk away. Do not fold an electric mat or weigh it down with heavy objects.

If the boiler breaks: duties under the Civil Act

When the boiler or water pipes in a studio apartment break down, the basic duties of the landlord and tenant are as follows.

The landlord must hand over the home to the tenant and keep it in the condition necessary for its use and benefit throughout the lease (Civil Act Article 623).

If the home needs repairs, the tenant must notify the landlord without delay. This does not apply if the landlord already knows (Article 634).

If the tenant has paid costs necessary to preserve the home (necessary expenses), the tenant may claim reimbursement from the landlord (Article 626, Paragraph 1).

Tenants have duties too. They must preserve the home with the duty of care of a good manager until it is returned (Article 374). They must use it in a manner consistent with the contract or the nature of the home. When returning it, they must restore it to its original condition (Article 610, Paragraph 1, and Article 615, applied to leases by Article 654). If a breakdown results from failing to meet this duty of preservation, the tenant may have to pay the costs.

The Civil Act does not specifically say who must fix a boiler or frozen pipes. It depends on the cause and extent of the breakdown and on any special terms in the contract.

Supreme Court precedent (including 2007Da91336) holds that the landlord must repair damage so serious that, without repair, the home cannot be used for its contractual purpose. Minor repairs that can be done easily may be borne by the tenant. Even if there is a special term saying the tenant will handle repairs, if its scope is not specified, it applies only to minor repairs. Major repairs, such as fixing extensive damage or replacing basic fixtures, remain the landlord's responsibility. Court commentary cites a boiler breakdown as an example of such a major repair.

If something does break, here is what to do. First, take photos of the damaged part. Notify the landlord right away using a method that leaves a record, such as a text message or messenger app. If you paid for repairs yourself, keep the receipts. Check whether the contract contains special terms on repairs. If a dispute arises, ask your school's international student office or a legal counseling organization for help.

Winter preparation checklist

• I have checked the unit price and basic charge of the city gas company in my area.
• I am ready to keep the indoor temperature at 18–20℃ and humidity at 40–60% (thermal underwear, humidifier, bubble wrap).
• I keep track of how long I use electric heaters and heated mats, and of the usage on my electricity bill.
• I know how to insulate the meter box and to leave water running during cold waves and long absences.
• I have checked where the gas valve is, the condition of the boiler exhaust pipe and whether there is a carbon monoxide alarm.
• If something breaks, I notify the landlord right away and keep a record.

Regional living cost budgets are covered in our living cost guide for international students in Seoul and other regions. If you are considering a dormitory instead of a studio, see university dormitory capacity disclosures. Rules on part-time work hours during vacation are in winter break part-time work hours and permits explained.

--- City gas rates are based on Seoul price information and KOGAS rate tables (November 1, 2026); support programs on the energy voucher and KOGAS websites (accessed November 8, 2026); frozen pipe guidance on the Seoul Metropolitan Government's 2025–26 winter guidance; and repair duties on the Civil Act (in effect March 17, 2026) and Supreme Court precedent.