The Most Efficient Space Heater Buying Guide and Reviews 2018-2019

If you are looking for a space heater for your home or office, undoubtedly you will be wanting one that is as energy efficient as possible. You will hopefully have already concluded that it is all very well staying warm, but that’s no use if the energy bills end up sky high.

The answer is to find the most efficient space heater, but as there are so many different types it can become confusing knowing which to buy.

This is where our review of the most efficient space heaters will help you, as we assess five very different space heaters which have proven to be very energy efficient.

Our buyer's guide will also assist you to learn more about these heaters and which features to look out for.

Product Summary





15.5 LBS.

26.4 LBS.

2.8 LBS.

40 LBS.

25 LBS.


27 X 10 X 22 


12.8 X 16.8 X 15.3 INCHES

9.3 X 7 X 6.7 


28 X 11 X 20 


5.9 X 13.8 X 24.9 INCHES








1500 WATTS

1500 WATTS


1500 WATTS

1500 WATTS













Reviews of The Most Efficient Space Heaters

Due to the way they produce heat, micathermic space heaters are known to be very energy efficient and this one from DeLonghi is no different.

Heat is generated by the heating elements and the mica which surrounds it conducts that heat which radiates out into the room without the need for noisy or inefficient fans.

You can control the heat output using the control dials on the side of the heater. These let you select the high setting at 1500 watts or the low one of 750 watts. Thereafter you can adjust the temperature further using the thermostat control.

The space heater unit can be wall mounted or it can sit on the floor. If on the floor, there is a tip-over safety cutoff in case it gets accidentally knocked over. There's also an overheating sensor which switches the heater off if the temperature gets too high.

Things We Like

  • Highly efficient micathermic heat process
  • Option to wall mount
  • Adjustable thermostat
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    Casters allow it to be moved easily
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    Overheat and tip-over cutoff switches

Things We Don't Like

  • The power cord is too short
  • Gives off an odor when new

This space heater utilizes highly efficient infrared heat which then radiates out into the room. Apart from its energy efficiency one of the main benefits of using this type of heater is that it does not dry the air in the room, which some other heater types tend to do.

Part of its efficiency is based on the fact its radiant heat can be used to heat a zone in a room and therefore allows you to switch off your central heating as there is no need to heat the entire room.

With a maximum output of 1500 watts, you can control the temperature in the room using either the digital control panel on the front of the heater or the more convenient way, which is using the remote control.

It is also a very safe heater thanks to its overheat sensor which switches the heater off if it gets too hot. The heater's unit stays cool to the touch which makes it safe to use when you have children in your home.

Find more infrared heater products' review in our infrared heater buying guide.

Things We Like

  • Adjustable heat levels
  • Remote Control
  • Efficient infrared heat
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    The unit is cool to the touch
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    Overheating sensor

Things We Don't Like

  • Wood effect finish looks unnatural
  • Very boring box-like design

Ceramic convection space heaters are not always regarded as the most energy efficient, but this little heater is one of the exceptions. The reason is that it is designed to heat very small areas and does so quickly, efficiently and very quietly too.

Its maximum output is just 950 watts, so it is going to require less energy than most other space heaters, regardless of how they operate. Nevertheless, this is still enough to heat the part of the room you are in. It is especially good for home offices or lounges as it is small and light enough to sit on a desk or side table.

When you switch in on you can set the heat to high or low, and you also have an option for the heater to oscillate from side to side. In warmer months you can have it running with just the fan to help cool the room.

It is also a very safe space heater thanks to cutoffs for both overheating and if it gets knocked over accidentally.

Find more ceramic heater products' review in our ceramic heater buying guide.

Things We Like

  • Small, light and portable
  • Can be placed on desks and tables
  • Oscillates over 90° angle
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    Option to use as a cooling fan in summer
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    Very quiet operation

Things We Don't Like

  • Tip over switch is too sensitive
  • The fan isn't very powerful

For those that want an efficient space heater, but also would like a degree of style and design in your home, an answer is an electric fireplace which uses infrared heat.

This electric fireplace from Lifesmart is one such heater, which produces heat quietly and efficiently via its infrared quartz heating process.

This electric fireplace can make it feel warmer even when not producing any heat thanks to its log effect and imitation flames which always make the room feel cozy. The dark oak colored fireplace surround and mantel add even more to the visual appeal of this heater.

To control the heat levels, it has a digital control panel on the front, but even better is the fact that you can control it from your armchair using the remote control. This lets you select one of the three heat levels which go to a maximum of 1500 watts and set the 12 hour on/off timer.

Find more electric fireplace products' review in our electric fireplace buying guide.

Things We Like

  • Very stylish dark oak color surround and mantel
  • Highly efficient and quiet infrared heat
  • Digital control panel and remote control
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    Imitation flames and log effect
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    12 hour on/off timer

Things We Don't Like

  • Buttons on remote control tend to stick
  • The fan can be rather loud

As efficient, portable heaters go, this oil-filled radiator from Delonghi is one of the most popular space heaters on sale today. A lot of that must come down to how energy efficient it is thanks to the fact that it can heat entire rooms so well that you do not the central heating switched on in there.

It is effectively a plug and play heater which you plug in, switch on, and then set what level of heat you want. It is rated up to 1500 watts, but you can select a lower setting too. Thereafter you can use the thermostat to adjust the heat to exactly the level you want.

Its casters mean you can wheel it from room to room and as it only weighs 25 lbs., it can be carried up or down stairs depending on where it is needed. Its overheat cut off means it is safe to be used in children's bedrooms or playrooms.

As it is sealed the oil will never need to be refilled and so the heater is effectively maintenance free.

Find more oil-filled heater products' review in our oil-filled heater buying guide.

Things We Like

  • Easy to move from room to room
  • Maintenance free
  • Very easy to operate
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    Adjustable heat settings and thermostat
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    Never needs refilling

Things We Don't Like

  • Take some time to heat up
  • Wheels are very flimsy

Buyer’s Guide

Popular Features to Look Out for In an Efficient Space Heater

All space heaters, including those which are the most energy efficient, have a number of features which are common to a lot of them. Obviously, there will be specific differences between the various types of space heater, and each manufacturer will have their own nuances.

It could be that there are one or two features that are especially important to you, or possibly some that you are not quite sure if you need or how they will benefit you.

If any of these scenarios ring true, or if you would simply like to have a fuller understanding of space heater features, including those relating to safety, then we recommend that you read our comprehensive buyers guide to space heaters for all the details.

How to Ensure You Buy the Most Efficient Space Heater for Any Room

There will be many factors which you consider when you buy a space heater and we assume that because you are reading this, efficiency is going to be one of them. In your thoughts, there may some features which have a higher importance than efficiency so maybe you will compromise on it a little if it means the other factors are satisfied.

If, however, energy efficiency is your one and overriding priority there is a simple way to ensure that the heater you are buying has the heat output for your needs, as opposed to using a heater that is too high or too low in terms of its energy rating. This does involve some simple calculations, but we promise there is nothing that you need a mathematics degree to work out.

The first step is to measure the dimensions of the room, so for our example, let's say you have a room which is 10 feet x 15 feet. To calculate the area, we multiply these two figures together, so this gives us 150 square feet.

To determine the rating that we need for that size of room, we simply multiply the room size by 10. With our example, we have 150 x 10 which gives us 1500. So, any space heater which has a rating of 1500 watts is suitable for that room.

You may come across some space heaters which are not rated in watts, but in British Thermal Units, or BTUs as they are more likely to be called. To convert BTUs to watts you divide them by 3.14. So, a heater with an output rating of 4500 BTUs is the equivalent of 1433 watts which we round up to 1500.

How to help Your Space Heater be Even More Efficient

If you drove your car fully loaded, with the air con on full, you would expect it to burn a lot more gas than normal. This same principle applies to space heaters because there are several actions you can take which can both reduce their efficiency and increase their efficiency. No prizes for guessing which you of these you should follow to reduce your energy bills. Here are some of them:

Choose a space heater with the heating capacity to suit the size of the room that it will usually be used in. Too low a rating will mean wasting power trying to heat a room in vain. Too high an output and you will be creating excess heat that is not required.

Try to eliminate as many sources of drafts as you possibly can. This includes open windows and doors. Heat escaping from a room due to drafts is one of the most common ways to waste energy as the heater needs to be kept on for longer or be set higher to keep the temperature in the room at the desired level.

As quickly as you can after you first get your space heater, determine which heat setting and if you have one, which thermostat position is optimum to keep you and others as warm as you need. Once you do so, it means that you are not constantly adjusting the thermostat which wastes a lot of heat and energy.

For those space heaters which have vents, fans, grilles, and other parts where dust can settle, clean them as often as you can. Dust and dirt getting inside your heater cause it to work harder to produce and distribute heat which will obviously mean it draws more energy. They can also damage your heater to the point where it needs replacing sooner than it would have otherwise.


We hope you have found our reviews and buyers guide useful and that they will help you to choose which type of efficient space heater you want.

Although we think each of them is excellent, the one which stands out for us and which we believe is the most efficient space heater is the DeLonghi EW7707CM Portable Oil-Filled Radiator Heater.  We love how portable it is and therefore, be used to safely heat any room in the house.

It is very easy to use, and its adjustable heat settings ensure that you can maintain the optimum temperature in the room, without using more energy than is needed. In fact, its heating power lets you reduce your central heating settings which save you even more money.

It is maintenance free, and should, therefore, be able to provide you with efficient heat for years to come.

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