How to choose an energy efficient space heater (2026)
Quick Answer
Choose a space heater by matching it to the room, how long you need heat, and how safely you can use it. For efficiency, look first at reducing draughts and heating only the occupied area, then choose a heater with useful controls such as a thermostat, timer and multiple heat settings, plus recognised safety features like tip-over and overheat protection.
Safety first
- Plug the heater directly into a wall socket unless the manufacturer explicitly states otherwise.
- Do not use a space heater with an extension lead, cable reel or multi-plug adaptor.
- Keep the heater well clear of curtains, bedding, upholstery, clothing and paper, following the manufacturer’s clearance instructions.
- Never cover the heater or use it to dry clothes.
- Place portable heaters on a stable, level surface where they cannot be knocked over.
- Keep children and pets away from hot surfaces and trailing cables.
- Do not use a heater in a bathroom or other wet area unless it is specifically designed, rated and installed for that environment in line with local electrical rules.
- Stop using the heater immediately if the cord, plug, casing or socket shows damage, scorching, unusual smell or repeated tripping.
- Turn the heater off and unplug it before cleaning, and only clean it as the manufacturer directs.
- Install and maintain working smoke alarms in the home.
When to call a professional: Stop and consult a qualified electrician if sockets are loose, cracked, discoloured, hot, or if circuits trip when heaters are used. Consult a heating professional if a room remains unusually cold despite normal heating, if you suspect insulation or ventilation defects, or if your main heating system may be faulty. If you need a heater in a bathroom, wet room, rental property with restrictions, or any location with special electrical requirements, get professional advice before buying or installing anything.
Overview
An “energy efficient” space heater is not just the one with the lowest advertised wattage or the most features. For electric resistance heaters, most of the electricity they use is turned into heat at the point of use, so the biggest differences in real-world running cost usually come from choosing the right heater for the job, using controls well, and avoiding heating more space or time than you need. A small desk heater for occasional close-up warmth is different from a heater for a draughty lounge or a well-insulated bedroom. Start by deciding whether you want fast spot heating, quieter background warmth, or heat that feels gentler over longer periods. Then check the room size, insulation, noise tolerance, and whether the heater will be used around children, pets or in a home office. Prioritise a clear energy label where applicable, straightforward controls, and safety instructions from the manufacturer. Avoid buying on marketing terms alone, especially vague claims about “low energy” or “ceramic savings” without explaining the use case. Also remember that a space heater is usually a supplement, not a cure for poor insulation, unsafe electrics or faulty central heating. If the room is persistently cold, it may be more cost-effective to tackle heat loss or have the main heating system checked.
Who this is for
People choosing a plug-in electric space heater for one room or a small area at home, including renters and homeowners who want practical, safer, lower-cost use rather than brand hype.
What you’ll need
- Approximate room size and how you use the space
- A suitable indoor power socket in good condition
- Manufacturer product information or manual
- Basic understanding of whether you need spot heat, background heat or portable heat
Before you start
Check whether the room is cold because of draughts, poor insulation, a blocked radiator, or a fault with the main heating. A space heater may help, but it should not be used to mask electrical faults, gas heating problems, damp-related issues or dangerously cold living conditions.
Step-by-step
- 1
Define how and where you need heat
Decide whether you need personal heat at a desk, short bursts in a bathroom-adjacent dressing area or bedroom, or longer heating for a living area. Note the room size, ceiling height, insulation quality, and whether doors are usually open or closed.
Why: This is the main factor in choosing efficiently: heating a person or a small closed room usually wastes less energy than trying to warm a large, leaky space with the wrong heater.
- 2
Choose the heater type to suit the use case
For fast warm air, consider a fan heater. For quieter, gentler background warmth, consider an oil-filled radiator or panel-style electric heater. For close-range personal warmth, consider a radiant or infrared-style heater where the manufacturer states it is intended for indoor residential use.
Why: Different heater types deliver heat differently. Matching the type to the task affects comfort, noise, and whether you end up running it longer than necessary.
- 3
Prioritise controls that reduce waste
Look for an adjustable thermostat, at least more than one heat setting, and if useful for your routine, a timer or programmable control. A frost or eco setting can help in some situations, but check the manual so you understand what the mode actually does.
Why: Useful controls help the heater cycle off or run less often once the space is warm, instead of blasting continuously.
- 4
Check safety features and placement needs
Look for overheat protection, tip-over shut-off for portable freestanding units, and clear instructions about minimum clearances from curtains, bedding and furniture. If the heater might be used in or near a bathroom, only choose a model specifically rated and approved by the manufacturer for that location and comply with local electrical rules.
Why: Space heaters are a fire and electric shock risk if the product or location is unsuitable, even if the heater appears efficient.
- 5
Assess the room and power supply honestly
Make sure the heater can be plugged directly into a suitable wall socket and that the lead will not create a trip hazard. Avoid planning to run it from an extension lead or power strip. If your home has older wiring, frequently tripping circuits, warm sockets or damaged outlets, stop and have the electrical system checked.
Why: A heater draws a significant electrical load for long periods. Poor connections and overloaded accessories are a known cause of overheating and fire.
- 6
Ignore vague efficiency marketing and compare practical features
Compare the manufacturer’s stated intended room use, controls, noise level, portability, cable length, safety features, and cleaning requirements. Treat claims such as “low energy”, “instant savings” or “heats any room cheaply” with caution unless the brand clearly explains the conditions and limitations.
Why: Marketing language often hides the fact that comfort and running cost depend more on room conditions and usage than on buzzwords.
- 7
Use the heater as part of a heat-loss plan
Before relying on the heater, close doors, reduce draughts, use curtains sensibly, and avoid placing the heater where furniture blocks airflow. If one room is always difficult to heat, compare the likely running cost of frequent heater use with simple draught-proofing or improving the main heating controls.
Why: The cheapest heat is heat you do not lose. Even a well-chosen heater will cost more to run if warm air escapes quickly.
Why this works
Electric space heaters can be effective because they deliver heat exactly where and when you need it. Real efficiency comes less from miracle technology and more from zoning heat to occupied spaces, choosing the right heat delivery method, and using thermostats, timers and sensible placement to avoid unnecessary runtime.
Common mistakes to avoid
- Buying purely on advertised wattage, without considering room size, insulation and intended use
- Using an extension lead, reel or multi-socket adaptor with a heater
- Placing a heater too close to curtains, bedding, sofas or drying clothes
- Assuming all heater types cost the same to run in practice because they all feel warm eventually
- Trying to heat a large, draughty room with a small personal heater
- Choosing a noisy fan heater for overnight bedroom use when quieter background warmth would suit better
Troubleshooting
The heater runs constantly but the room still feels cold
Check for draughts, open doors, poor insulation, blocked airflow or a heater that is too small for the space. Try zoning the area, shutting the door, and moving seating closer rather than simply running it longer.
The socket or plug feels unusually warm
Turn the heater off, unplug it when safe, and stop using that socket until the heater, plug and household wiring have been checked. Do not move the heater to an extension lead.
The heater switches off unexpectedly
Check whether tip-over protection or overheat protection has activated. Let it cool, ensure vents are clear, place it on a stable level surface, and follow the manufacturer reset instructions.
The heater makes the room dry or stuffy
Reduce runtime, lower the thermostat if possible, and improve ventilation briefly when safe. Also check that you are not overheating a small closed room.
Compare your options
Fan heater
Best for: Fast heat in a small room for shorter periods
Pros: Quick warm-up, usually portable, often compact
Cons: Can be noisy, less comfortable for long steady heating, easy to overuse for longer sessions
Oil-filled radiator
Best for: Quieter background warmth over longer periods in enclosed rooms
Pros: Quiet operation, more even feel of heat, no exposed glowing element
Cons: Slower to warm up, often heavier and less convenient to move
Panel or convector heater
Best for: General room heating where quietness and slim shape matter
Pros: Typically quiet, simple controls, suitable for keeping a room at a set temperature
Cons: Can be less effective in very draughty rooms, warmth may feel less immediate than fan heat
Radiant or infrared-style heater
Best for: Direct personal warmth in a fixed seating or standing area
Pros: Heats people and surfaces directly, can feel effective without warming the whole room first
Cons: Best within its line of heat, may not heat the whole room evenly, placement is critical for safety
| Option | Best for | Pros | Cons |
|---|---|---|---|
| Fan heater | Fast heat in a small room for shorter periods | Quick warm-up, usually portable, often compact | Can be noisy, less comfortable for long steady heating, easy to overuse for longer sessions |
| Oil-filled radiator | Quieter background warmth over longer periods in enclosed rooms | Quiet operation, more even feel of heat, no exposed glowing element | Slower to warm up, often heavier and less convenient to move |
| Panel or convector heater | General room heating where quietness and slim shape matter | Typically quiet, simple controls, suitable for keeping a room at a set temperature | Can be less effective in very draughty rooms, warmth may feel less immediate than fan heat |
| Radiant or infrared-style heater | Direct personal warmth in a fixed seating or standing area | Heats people and surfaces directly, can feel effective without warming the whole room first | Best within its line of heat, may not heat the whole room evenly, placement is critical for safety |
Alternatives
- Improve draught-proofing and insulation in the room
- Adjust or repair the main heating system and room controls
- Use a heated throw or electric blanket approved for the intended use instead of heating the whole room, following the manufacturer instructions
Pro tips
- If you only need warmth while sitting still, direct personal heating can be more practical than trying to raise the temperature of the whole room.
- Choose a heater with simple, readable controls if several people in the home will use it.
- Keep the filter or air inlets clean if the manufacturer says they require cleaning; blocked airflow can reduce performance and trigger overheating.
- For bedrooms or workspaces, check noise expectations before you buy, not after.
- Store the manual or download it before first use so you can check clearance, cleaning and reset instructions.
Legal & regulatory notes
Electrical product requirements, bathroom use rules, and rental property obligations vary by country and region. Follow the manufacturer instructions, use products that are legal for sale in your market, and comply with local electrical and fire safety requirements. In rented homes or flats, fixed heating alterations may need landlord approval and professional installation.
What this guide does not cover: This guide covers choosing a portable electric space heater for domestic indoor use. It does not provide installation instructions for fixed electric heaters, does not cover gas, paraffin or diesel heaters, and does not replace the manufacturer manual, local electrical regulations, or professional assessment of wiring, insulation, damp, ventilation or central heating faults.
Cost considerations
Running cost depends on the heater’s power setting, how long it runs, your electricity tariff, and how much heat the room loses. In many homes, the biggest savings come from heating only occupied spaces, using thermostats and timers properly, and reducing draughts rather than relying on marketing claims about a heater being uniquely “cheap to run”.
Prefer to hire a professional?
If this job is beyond a confident DIY — or the work needs to be done by a licensed professional — you can find a verified heating & cooling specialist through Trade Directory (tradedirectory.co.nz), New Zealand's directory of real, verified trade businesses. Compare local tradespeople, read their details and request quotes before you commit.
Find a heating & cooling specialist on Trade DirectoryFrequently asked questions
Are some electric space heaters much more energy efficient than others?+
For standard electric resistance heaters, the main differences in real use are usually heat delivery, controls and suitability for the room rather than one model magically creating far more heat from the same electricity. The right type, in the right room, used with a thermostat and sensible timing, usually matters most.
Is a higher wattage heater always more expensive to run?+
A higher power setting uses more electricity while it is actively drawing that power, but a better-matched heater may warm the space faster or cycle off sooner. Compare how you will use it, not just the headline figure.
What is the safest type for a bedroom?+
There is no single safest type for every bedroom. Look for a heater intended for indoor domestic room use with overheat protection, stable placement, clear instructions and controls you can set sensibly. Keep it well away from bedding and curtains, and avoid leaving any heater operating contrary to the manufacturer guidance.
Can I use a smart plug to control a space heater?+
Only if both the heater manufacturer and the smart plug manufacturer clearly allow that use and the load is suitable. Many safety authorities warn against using high-load appliances on unsuitable adaptors or accessories, so if there is any doubt, do not do it.
Should I repair an old heater or replace it?+
Replace it or have it professionally checked if it has a damaged cord, loose plug, overheating smell, unreliable safety cut-out, or unknown history. A cheap heater is not worth keeping if its electrical safety is uncertain.
Sources & references
Guidance on this page is traced to documented sources. Last checked 24 September 2026.
- Electrical Safety First · industry
General electrical fire safety, avoiding misuse of high-load appliances, and checking plugs, sockets and damaged electrical equipment.
- U.S. Department of Energy - Energy Saver · government
Energy-saving principles such as zone heating, reducing heat loss, and using controls and insulation measures effectively.
Core safety and selection principles stay fairly stable, but product features, local electrical rules and available heater types change over time.