Space Heater vs Central Heating: Which Costs Less?

Heating your home can get expensive, but is a space heater actually cheaper than central heating? In many cases, it can be if you're only warming one room for a few hours. For example, a 1,500-watt space heater running for four hours uses 6 kWh of electricity. At $0.20 per kWh, that's $1.20 a day, or $36 a month if used daily. At €0.25 per kWh, the same usage costs €1.50 a day, or €45 a month. However, an efficient central heating system or heat pump may be cheaper, depending on your energy rates and how much of your home you need to heat. Let's compare the costs to help you find the most economical option.

A space heater can be cheaper than central heating when you only need to heat one room for a few hours, but it isn't always the most economical option. The answer depends on your energy prices, the area you're heating, and the efficiency of your existing heating system.

For example, a 1,500-watt electric space heater running for four hours uses 6 kWh of electricity. At $0.20 per kWh, that costs $1.20 per day, or $36 per month if used daily. At €0.25 per kWh, the same usage costs €1.50 per day, or €45 per month.

If you’re considering running a heater for longer periods, see our guide to how much it costs to run a space heater 24/7 for a closer look at the potential electricity costs.

However, these figures only cover the space heater. To determine whether it's cheaper than central heating, you also need to consider how much energy your main heating system would use to provide comparable warmth.

According to the Energy Saving Trust's guide to electric heating, portable electric heaters can be useful for warming individual rooms, but their running costs can be high compared with systems such as gas heating and heat pumps. Heat pumps are particularly worth considering because they can deliver substantially more heat energy than the electricity they consume.

If you mainly use one room during the day, a space heater may be worth considering. If you need to heat several rooms, an efficient central heating system may offer better value.

Enter your heating details in the calculator below to estimate your space heater's running costs and compare them with your central heating expenses. The cost table that follows provides examples for common space heater wattages.

A space heater's running cost depends on its power rating, how long you use it, and your electricity price. Use the calculator below to estimate daily and monthly costs, then compare them with your central heating expenses for the same period.

For example, a 1,500-watt space heater running for four hours uses 6 kWh of electricity. At $0.20 per kWh, that costs $1.20 per day, or $36 over 30 days. Your actual costs may differ depending on your electricity tariff and how often the heater operates at full power.

Central heating costs depend on your system, fuel prices, efficiency, and the area you need to heat. The U.S. Department of Energy's guide to direct heating equipment explains the basics of electric space heaters, while the Energy Saving Trust's electric heating guide discusses their benefits and running costs compared with other heating options.

Enter your electricity price and typical heater usage, then add your estimated central heating cost for the same period. For the fairest comparison, consider the cost of heating a similar area to a similar comfort level.

The calculator provides an estimate, not a guaranteed saving. It assumes the space heater draws its full rated power while running. Actual consumption may be lower if its thermostat cycles off. Make sure the central heating figure covers the same period and a comparable heating need.

A positive estimated difference means the space heater costs less than your entered central heating cost for the period. A negative difference means it costs more. If the difference is close to zero, the estimated costs are similar.

Remember that this is a running-cost comparison, not necessarily a measure of total heating efficiency. Electric resistance heaters convert electricity into heat at the point of use, whereas heat pumps can deliver several units of heat per unit of electricity consumed. As a result, an efficient heat pump may be cheaper to operate, depending on local energy prices and operating conditions.

Use your results alongside the cost table above to understand typical running costs. In the next section, we'll look at when a space heater is likely to offer better value and when central heating may be the more economical choice.

If you spend most of your day in one room, a portable heater may help you avoid heating unused areas. Whether this saves money depends on how much energy your central system would otherwise use and whether you can lower the main thermostat without making the rest of your home too cold.

For a whole home, the type of heating system matters as much as the area being heated. The International Energy Agency explains that heat pumps transfer heat rather than generating it all from electricity, so they can provide several units of heat for each unit of electricity consumed. This can make them cheaper to operate than conventional electric resistance heaters, depending on local energy prices (IEA guidance on how heat pumps work).

A 2023 review of heating technologies across 11 European countries also found substantial differences in efficiency and operating costs between systems. Its findings show why the best-value option varies with the technology and country (research published in Energy).

Similarly, a 2025 study in Applied Energy compared nine residential heating and cooling systems in Athens, Strasbourg, and Helsinki. It found that economic performance depended on local climate and energy prices, reinforcing the importance of comparing options under your own conditions (read the study on residential heating costs).

The bottom line: a space heater may be cheaper for occasional, single-room heating, but an efficient central system—particularly a heat pump—may offer better value for regular or whole-home heating. For the fairest comparison, compare the costs of heating a similar area to a similar comfort level over the same period.

A space heater can be cheaper when you only need heat in a small area for a limited time. It’s most useful in these situations:

• Heating one occupied room: If you’re working in a home office or relaxing in one bedroom, a space heater can warm that area without requiring you to heat the entire home.

• Using supplemental heat for a few hours: If you need extra warmth during a cold morning or evening, a portable heater can be practical. However, compare its electricity cost with your main heating system, as electric heaters can be more expensive to run per unit of heat.

• Avoiding unnecessary whole-home heating: If the rest of the home is unoccupied, turning down central heating and warming only the room you’re using may reduce energy use. This works best when your main system allows you to adjust heating effectively.

The U.S. Department of Energy’s guidance on room heaters notes that electric room heaters can be cost-effective for infrequently used rooms, particularly in well-insulated homes. The key is to heat only the space you need, for only as long as you need it—while keeping the home safely warm enough to avoid problems from excessive cold or dampness.

Central heating can be cheaper when you need to heat several rooms or your entire home regularly, especially if your system is efficient and your home is well insulated. Using multiple electric space heaters for long periods can become expensive, particularly if electricity rates are high.

• Heating multiple rooms: If your family uses several rooms throughout the day, central heating may provide better value than running separate space heaters in each room.

• Using an efficient heating system: Heat pumps are often among the cheapest systems to operate. The European Commission notes that switching from a gas boiler to a heat pump can reduce heating bills, depending on local energy prices and the home’s efficiency (European Commission guidance on heat pumps).

• Maintaining comfortable temperatures throughout the home: If you want several rooms to stay warm throughout the day, an efficient central system can provide consistent heat without needing to manage multiple portable heaters.

However, central heating is not automatically cheaper. Heating unused rooms can waste energy, while a space heater may cost less if you only need warmth in one area. If your central system has zone controls, use them to heat the rooms you actually need.

You don’t always need to replace your heating system to lower your energy bills. Small changes to how you heat your home, combined with better insulation and regular maintenance, can help reduce energy use without sacrificing comfort.

• Adjust your thermostat: Lower the temperature a little when you’re asleep or away, and avoid heating rooms more than necessary. The U.S. Department of Energy recommends using thermostat setbacks to reduce heating and cooling costs.

• Improve insulation and seal drafts: Seal gaps around doors and windows, and check whether your attic and walls have adequate insulation. According to ENERGY STAR’s guide to sealing and insulating, air sealing and insulation can improve comfort and reduce energy bills.

• Heat occupied spaces efficiently: If you spend most of your time in one room, a space heater may help you avoid heating unused areas. Compare its running cost with your main heating system before deciding which is cheaper. If you’re choosing a heater for regular use, explore our guide to the most energy-efficient space heaters to learn more about options that may help reduce energy consumption.

• Maintain your heating equipment: Clean or replace filters as recommended by the manufacturer, keep radiators and vents unobstructed, and arrange regular servicing where required. ENERGY STAR’s heating and cooling advice explains how maintenance can help equipment run efficiently.

For more personalized savings, use the space heater vs. central heating cost calculator above with your actual energy rates.

So, is a space heater cheaper than central heating? It can be, but it depends on how much of your home you need to heat, how long you need heat, and the efficiency of your existing system.

If you spend most of your time in one room, a space heater may help lower your heating bill, especially if you turn down your central heating at the same time. However, using a portable electric heater for many hours a day can become expensive. For heating several rooms or an entire home, central heating may offer better value, particularly if you have an efficient heat pump.

Before choosing, compare the running costs using your actual electricity and fuel prices, and consider how much heat each option delivers. Improving insulation, sealing drafts, and using a thermostat wisely can also help reduce energy consumption.

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