When you shop through links on our site, we may earn an affiliate commission. This educational content is not intended to be a substitute for professional advice.

Best Indoor Heater For Power Outage (2025 Update)

If you're looking for a reliable indoor heater to keep you warm during a power outage, there are a few important factors to consider before making a purchase. First and foremost, you want to make sure that the heater is capable of providing enough heat to effectively warm up the space you intend to use it in. Look for heaters that have a high BTU (British Thermal Unit) rating, as this indicates the heating capacity. Additionally, consider the size and portability of the heater. You want something that is compact and easy to move around, especially during a power outage when you may need to change locations frequently. Finally, safety is paramount. Look for heaters that have built-in safety features such as tip-over protection and overheat protection to prevent any accidents or damage.

Now that you have a better idea of what factors to consider, you might be wondering, "Which indoor heater is the best option for a power outage?" Are there any models that are known for their reliability and performance in emergency situations? How do the different types of heaters, such as ceramic or infrared, compare when it comes to energy efficiency and effectiveness? In the following article, we will explore the top indoor heaters for power outages and answer these questions, providing you with all the information you need to make an informed decision. Stay tuned to find the perfect indoor heater to keep you warm and comfortable, no matter the circumstances.

10 Best Indoor Heater For Power Outage

# Product Image Product Name Product Notes Check Price
1
The product is ideal for heating small to medium-sized rooms and easy transport with its carry handle.
2
The product is ideal for providing heat in offices, homes, garages, and workshops with overheat protection and a ceramic heating element.
3
Ideal for providing quick and efficient heating in small indoor spaces like homes and offices.
4
The product is ideal for heating small indoor spaces, such as offices, bedrooms or personal rooms with its thermostat and safety features.
5
This product is ideal for providing heat and temperature control in a variety of indoor settings, including homes, offices, and bedrooms.
6
Ideal for providing supplemental heat in small spaces like offices and dorm rooms.
7
Ideal for heating small indoor spaces with adjustable temperature settings, tip-over and overheat protection.
8
Ideal for heating small indoor spaces like bedrooms, offices, and desks with its 1500W/750W power and oscillating feature.
9
It is ideal for providing heat in small indoor spaces and has overheat protection for safety.
10
The product is ideal for providing efficient heating in small spaces like homes, dorms, offices, desktops, and kitchens.
The product is ideal for heating small to medium-sized rooms and easy transport with its carry handle.
The product is ideal for providing heat in offices, homes, garages, and workshops with overheat protection and a ceramic heating element.
Ideal for providing quick and efficient heating in small indoor spaces like homes and offices.
The product is ideal for heating small indoor spaces, such as offices, bedrooms or personal rooms with its thermostat and safety features.
This product is ideal for providing heat and temperature control in a variety of indoor settings, including homes, offices, and bedrooms.
Ideal for providing supplemental heat in small spaces like offices and dorm rooms.
Ideal for heating small indoor spaces with adjustable temperature settings, tip-over and overheat protection.
Ideal for heating small indoor spaces like bedrooms, offices, and desks with its 1500W/750W power and oscillating feature.
It is ideal for providing heat in small indoor spaces and has overheat protection for safety.
The product is ideal for providing efficient heating in small spaces like homes, dorms, offices, desktops, and kitchens.

1. Black+decker Portable Space Heater, 1500w Room Space Heater With Carry Handle For Easy Transport

Introducing the BLACK+DECKER Portable Desktop Heater, the perfect solution for those who need extra warmth in any room. This lightweight personal heater weighs only 2.8 lbs. and comes with a carry handle for easy transport. It can be mounted on the floor or tabletop, making it versatile for any space.

This heater and fan combo is compact yet powerful, with dimensions of 7.3” x 6.3” x 9.2”. It's perfect for your dorm or office desk, bedroom table, basement, garage worktable, RV shelf, and just about anywhere you need extra heat. The BLACK+DECKER Portable Desktop Heater is easy to use, with an adjustable thermostat control that lets you choose your optimal setting: LOW HEAT (750 Watts), HIGH HEAT (1500 Watts), or FAN.

Designed with safety in mind, this flameless portable heater comes with overheat protection and an auto tip-over shutoff feature that lets you rest easy while staying safe. It's important to note that this heater is for indoor use only.

BLACK+DECKER is known for their quality products, and this Portable Desktop Heater is no exception. It comes with a 1-year warranty, so you can feel confident about your purchase. Whether you need extra warmth in your office, bedroom, or any other room, the BLACK+DECKER Portable Desktop Heater is the perfect solution for you.

2. Etl Listed Ceramic Heater For Ultimate Comfort

Introducing a ceramic space heater that is perfect for any space in your home, office, workshop, or even covered patio. This portable heater is ready to use right away with just a snap of the legs and plug it in.

Constructed with durable powder coat finish, this ceramic space heater is designed to last for a long time while maintaining its luster. It also features a ceramic heating element that has an exceptional lifespan, providing efficient heating for your space.

Safety is a top priority in this portable heater, as it is ETL listed with overheat protection. You can trust its reliability and dependability, and it comes with a limited 1-year warranty from its Texas-based manufacturer. This heater is not a cheap, dangerous product, ensuring that you and your loved ones are safe at all times.

This ceramic space heater produces 5120 BTUs of heat production with the ease of electricity, operating on 110v / 60Hz. With its lightweight and portable design, you can easily move it from one area to another, and it's effortless to operate.

This portable heater uses a standard 110V plug, making it easy to use anywhere, heat anywhere, and instantly. Purchase with confidence, knowing that it comes with a 1-year limited warranty.

3. Andily Desk Heater: Warmth For Home & Office.

Introducing the Small Heater – a compact and portable solution for your indoor heating needs. Measuring at 4.33’’L X 3.63’’W X 6.39’’H, this heater is not only easy to carry with just one hand, but it's also fully assembled and comes with manual controls.

Equipped with a powerful 500W Ceramic Heater and Fan, this mini heater can create comfortable temperatures in your room in no time. The power indicator light allows you to know when it's plugged in, and the fan is designed to be extremely quiet, ensuring that it won't disrupt your peaceful environment.

The Mini Heater is designed with simplicity in mind, with only one power switch that is easy to control. The fan at the back of the heater is efficient for both heating and ventilation, and the plastic floor mat ensures that the heater is freestanding.

This small heater is perfect for use in your office or room. Its portability and ease of control make it perfect for heating up different surroundings. Whether you're at work, you can put it on or under your desk to create a warm work environment. And when it's time to sleep, you can place it near your pillow to enjoy the warm breeze and have a comfortable sleep.

Safety is a top priority and this heater is designed with several safety features to give you peace of mind. Firstly, an automatic overheat system will shut the unit off when the parts of the heater overheat. Secondly, the tip-over protection feature ensures that the heater automatically shuts off when tipped forward or backward. The power indicator light allows you to know at a glance that it's plugged in. Lastly, this heater is ETL certified, ensuring that it meets the highest safety standards.

4. Silverheat – Personal Ceramic Room Heater

The Safe and Speedy Ceramic Heater is an excellent choice for those looking for a compact and efficient heating solution. This heater is designed with safety in mind and is made of flame retardant materials to minimize any fire hazards. Additionally, the automatic overheat protection system will ensure the unit shuts off when the temperature limit is reached. The tip-over switch at the bottom of the heater will also activate if the unit is tilted or tripped over, further enhancing its safety features.

The Speedy Ceramic Heater is very efficient and provides a quick solution to heating up small spaces of up to 200 square feet. It uses PTC ceramic heating technology and a high-speed fan to produce a lot of heat in just a few minutes. This means you can save money on electricity bills by only heating the spaces you need, rather than the entire house. The heater operates quietly at less than 45 decibels, making it perfect for indoor sleeping, reading, and working.

Operating the Speedy Ceramic Heater is a breeze. Simply adjust the knob on the right to turn it on. The "I" setting produces heat at 750 watts, while the "II" setting produces heat faster and hotter at 1500 watts. The "Fan" setting will blow out cool air. Then, turn the thermostat knob on the left towards the + sign to adjust the desired temperature range, which is between 0℉ to 158℉. The heater will cycle on and off to maintain the desired temperature.

The compact design of the Speedy Ceramic Heater makes it highly portable and easy to use. It has a lightweight and comes with an easy-carry handle, making it simple to move from room to room. It is an excellent choice for those who want to save space in crowded areas. This heater is ideal for use in offices and makes an excellent gift for friends and family during the winter months.

The Speedy Ceramic Heater is designed for long-lasting use. It has a tip-over switch, overheat protection, and ceramic speedy heating and cooling, which ensures steady operation and a long service life. You can rest easy knowing that accidental damage during winter life won't be a concern. Overall, the Safe and Speedy Ceramic Heater is an excellent choice for those looking for a compact, efficient, and safe heating solution for their home or office.

5. Flexheat: Versatile 1500w Heater For Any Space

Looking for a cost-efficient and powerful space heater to keep you warm this winter? Look no further than this electric heater! With advanced ceramic heating elements, this heater provides faster and more energy-efficient heating than traditional electric space heaters, costing just $0.19 per hour to run.

Featuring 750W (Low) and 1500W (High) power modes, as well as a fan-only mode, this small space heater is perfect for heating individual rooms and reducing your energy bills. The adjustable thermostat control monitors the surrounding air temperature for optimal heating efficiency, making it the perfect room heater for bedroom, office, and under desk use.

Safety is a top priority with this portable heater, which includes built-in overheat protection and an enhanced anti-tip over switch, ensuring the mini heater instantly switches off in any unsafe situation. This gives you complete peace of mind while using this heater.

The lightweight and compact design of this space heater for bedroom makes it ultra-portable, allowing you to transport it wherever you need it most. It's perfect for use in homes, garages, dorms, and offices. The dimensions of this heater are 6.5” x 5” x 9”, and it operates at 120V, 60Hz.

6. Wall Space Heater With Adjustable Thermostat And Timer

Introducing the Low Wattage Space Heater, the perfect solution for individuals living in mild climates who want to save on energy costs without compromising on warmth. This heater operates at 350 watts, 120 volts, 2.9 amps, and 60Hz, making it more economical than other high-wattage space heaters. Plus, it won't overload the circuit, giving you peace of mind while staying warm.

Featuring a rotating plug with three prongs that can rotate up to 180 degrees, this space heater also has a button under the plug to adjust the rotating degree. It's both user-friendly and convenient. But that's not all – it also has an LED display and timer. By pressing the "Timer" button, you can scroll through 1 to 12 hours in 1-hour increments. You can set the heater to turn on automatically by pressing the "Timer" button until the LED display shows the number of hours you want. When you want the heater to turn off automatically, ensure it's turned on, and keep pressing the "Timer" button until it reaches your desired time.

This space heater also has a digital thermostat, unlike most space heaters that only offer low, medium, and high options. With the Low Wattage Space Heater, you can adjust the desired temperature from 60°F to 90°F, and it will turn itself on and off to maintain that temperature. Plus, the outer surface stays cool, ensuring that it's safe to use around children and pets.

Not only is this space heater efficient, but it's also quiet and fast heating. It's incredibly quiet and can heat up to 100 square feet of space, making it perfect for smaller places like offices, dorm rooms, desks, and tables indoors. Use it at home when you don't want to heat the entire house with other centralized heaters. Plus, it's so quiet that it won't keep you awake at night, making it an ideal choice for the bedroom.

The Low Wattage Space Heater is compact, measuring 4.3 x 2.8 x 6.5 inches, making it easy to carry around wherever you want without any wires. It's ETL listed and mounts right on the receptacle, allowing you to save floor space and avoid tripping over cords. The modern look also makes it blend well with any living room, bedroom, or other areas of the house, so you won't have to worry about it being an eyesore.

7. Isiler Ceramic Portable Heater With Tip-Over Protection

The small space heater is a reliable and safe option for those looking to heat up a room quickly. Made from fire-retardant materials, this ceramic heater has added safety features such as a self-regulating element and automatic overheating protection. In case of accidental knocks, the Tip-Over Protection will shut off the heater to prevent any accidents. It’s also designed to automatically shut off if the temperature exceeds the limit value and will turn back on once it’s at a safe temperature inside.

With adjustable thermostat control, this small space heater offers a temperature range of 41 °F-95 °F, allowing you to choose the optimal temperature for your comfort. Once the room is warm, you can rotate the thermostat control dial to lower the temperature, which will greatly reduce power consumption.

Thanks to its reliable ceramic heating elements and large air outlet, the small space heater heats up a room within seconds with its 1,500 W output. It can distribute warm air evenly around a large area of up to 108 sq. ft., making it suitable for living rooms, dressing rooms, bedrooms, studies, offices, and more.

Measuring just 6 in x 6.7 in x 7 in and weighing in at just 38.8 oz, this space heater is compact, portable and convenient. The light weight and ergonomic handle make it easy to transport from room to room.

It's important to note some safety precautions to keep in mind while using this space heater. Firstly, to avoid burns, do not let bare skin touch hot surfaces. Secondly, do not use the heater outdoors. Thirdly, in order to avoid overheating, do not cover the heater. Lastly, do not use the heater in the immediate surroundings of a bath, a shower or a swimming pool. If you want to use the heater in the bathroom, please use it when the bathroom is dry and avoid the heater/plug being splashed with water.

8. Quickheat Portable Room Heater – Brightown

This easy-to-use and energy-efficient heater is perfect for heating small spaces in homes, offices, and bedrooms. With a range of features, this portable mini heater is a great addition to any room.

Operating the heater is simple and straightforward. The knob on the right side of the unit controls the heat output. Turning it to "I" produces 750 watts of heat, while turning it to "II" produces 1500 watts of heat. The "Fan" setting blows out cool air. The thermostat knob on the left side of the heater can be adjusted to a range of 0℉ to 158℉ to cycle the heater on and off based on the room's temperature.

This energy-efficient heater is equipped with a 70-degree oscillating switch on the top, PTC ceramic heating technology, and a high-speed fan that heats up the room quickly and effectively. It can heat up a 200 square foot room in seconds, making it ideal for small spaces. The heater is also quiet enough to use in a bedroom while sleeping, helping save on electric bills by heating only the space that needs it.

The portable mini heater is lightweight and easy to carry around with its built-in handle. The heater is 7.9 X 6.1 x 11 inches in size and weighs only 3.59 pounds. It is a 120V 60Hz heater with a 6-foot long cord and a 2-prong connection, making it suitable for indoor use.

Safety is always a top priority, and this heater is designed with that in mind. The heater is made of flame retardant material, making it zero fire hazard. It also has tip-over protection, which shuts off the heater if it's knocked over, making it perfect for homes with kids and pets. Overheat protection ensures that the heater will automatically shut off if it overheats.

With its tip-over switch, overheat protection, flame retardant material, and ceramic speedy heating and cooling, this heater is built to last for many winters to come. You can enjoy a warm and comfortable space without worrying about accidental damage or safety hazards.

9. Compact Heat: Black+decker Portable Heater

Introducing the Portable Ceramic Heater by BLACK+DECKER, a lightweight and convenient heating solution for small spaces. Weighing only 3 lbs. and equipped with a carry handle, this heater can be easily moved from room to room.

This heater and fan combo is ultra-compact yet powerful, measuring only 7.5 x 6.3 x 9.5 inches. It can fit on your dorm or office desk, bedroom table, basement, garage worktable, RV shelf, or just about anywhere you need extra heat.

The manual adjustable thermostat control allows you to set the heat to LOW (900 Watts) or HIGH (1500 Watts), or to FAN mode. Simply plug it in with the 6 ft. power cord and enjoy the warmth.

Designed for safety, this mini heater features overheat protection and auto tip-over shutoff, giving you peace of mind while staying comfortable. Please note that this heater is for indoor use only.

BLACK+DECKER is committed to providing high-quality products, which is why this Portable Ceramic Heater comes with a 1-year warranty. With this purchase, you can be confident in your investment. Stay warm and cozy with the Portable Ceramic Heater by BLACK+DECKER.

10. Andily Portable Ceramic Space Heater – Compact & Versatile!

Introducing the Ceramic Space Heater with Advanced PTC Technology. This heater is equipped with a state-of-the-art ceramic heating element that utilizes Quick Heat technology, providing faster and more efficient heating compared to traditional heaters. With its advanced ceramic heating element, this space heater maximizes heat output without the need for open coils, ensuring longer lasting use. Not only does it deliver powerful heating performance, but it also operates quietly, allowing you to enjoy warmth without any disturbances.

Safety is a top priority with this space heater. It features an Auto Safety shut off system that includes multiple levels of safety for your peace of mind. The automatic overheat system will shut off the heater if any parts become too hot, preventing any potential accidents. Additionally, the TIP-OVER SWITCH will instantly turn off the heater if it is tipped forward or backward, further enhancing safety precautions. The power indicator light conveniently lets you know when the heater is plugged in and operating. Rest assured, this heater is ETL listed for certified safe use.

Achieving your desired level of comfort is made easy with the adjustable thermostat. The Comfort Control Thermostat allows you to set the temperature to your preference, ensuring a cozy environment. Simply turn the dial to the desired heat setting and enjoy the comforting warmth provided by this space heater.

This versatile space heater offers three heat settings to suit your needs. Choose from High Heat (1500-watt) for maximum warmth, Low Heat (750-watt) for a more gentle heat, or use the fan setting for a refreshing breeze during the summer months. Whether you need to warm up your personal space or cool it down, this electric space heater has got you covered. It's perfect for both home and office use.

Measuring at 7.48" x 5.31" x 9.64", this compact heater is designed to be energy efficient and fully assembled for your convenience. Its lightweight and portable design features an easy grip handle, allowing you to easily move it from one room to another. The adjustable thermostat ensures comfortable warmth in small areas, making it an ideal choice for personal use. Plus, the 6ft long cord provides flexibility and unobstructed use.

Best Indoor Heater For Power Outage FAQs

Are there any indoor heaters specifically designed for power outages?

Yes, there are indoor heaters specifically designed for power outages. One popular option is a propane-powered indoor heater. These heaters are designed to provide heat when there is no electricity available. They typically use small propane canisters as fuel and can be used in well-ventilated areas. Another option is a kerosene heater, which can also be used during power outages. Kerosene heaters are portable and can provide a good amount of heat. However, it is important to ensure proper ventilation when using kerosene heaters to prevent the buildup of harmful fumes. Additionally, some portable electric heaters come with a battery backup feature that allows them to continue operating during power outages. These heaters use rechargeable batteries and can provide heat for a limited period of time. Before purchasing any indoor heater for power outages, it is important to carefully read the manufacturer's instructions and safety guidelines to ensure proper usage and prevent any accidents.

Are there any indoor heaters that can also be used as a backup power source during an outage?

Yes, there are indoor heaters available that can also serve as a backup power source during an outage. One option is a propane-powered heater with a built-in generator. These heaters use propane as a fuel source to generate heat, and they also have the ability to generate electricity to power small appliances or charge devices. They typically come with outlets or USB ports that allow you to connect your devices directly to the heater. Another option is an electric heater with a built-in battery backup. These heaters have a rechargeable battery that can provide power during an outage. However, it's important to note that the battery backup on these heaters is usually limited and may not last for an extended period of time. Additionally, it's always advisable to follow safety precautions when using any heating device, including ensuring proper ventilation and keeping flammable materials away from the heater.

Are there any indoor heaters that can be used without electricity during a power outage?

Yes, there are indoor heaters that can be used without electricity during a power outage. One option is a propane heater, which operates using propane fuel. These heaters are often portable and can provide heat in areas where there is no electricity. Another option is a kerosene heater, which uses kerosene as fuel. These heaters are also portable and can be used indoors without electricity. It is important to note that when using any type of fuel-burning heater indoors, proper ventilation is essential to prevent the buildup of harmful fumes. Additionally, it is crucial to follow the manufacturer's instructions and safety guidelines to ensure safe operation. If you are considering using a non-electric heater during a power outage, it is recommended to have a carbon monoxide detector in place and to have the necessary fuel supply on hand.

Are there any safety features to consider when selecting an indoor heater for power outages?

When selecting an indoor heater for power outages, there are several safety features to consider. Firstly, it is important to choose a heater with an automatic shut-off feature. This ensures that the heater will turn off automatically if it overheats or if it accidentally tips over, reducing the risk of fire or burns. Additionally, look for a heater with a cool-touch exterior, as this will prevent accidental burns if you or a family member accidentally come into contact with the heater. Another important safety feature is a thermostat that allows you to set and maintain a desired temperature. This helps to prevent the heater from running excessively and potentially causing overheating. Lastly, consider the presence of a safety certification, such as UL (Underwriters Laboratories), which ensures that the heater has undergone rigorous testing for safety standards. Overall, prioritizing these safety features will help ensure that your indoor heater is secure and reliable during power outages.

Can the best indoor heaters for power outages be used in small spaces, such as bedrooms or offices?

Yes, the best indoor heaters for power outages can definitely be used in small spaces such as bedrooms or offices. In fact, these compact heaters are specifically designed for smaller areas and are highly efficient in providing warmth and comfort during power outages. They are typically portable and easy to move around, making them ideal for use in different rooms.

When choosing an indoor heater for small spaces, it's important to consider the size of the room and the specific heating needs. Look for heaters with adjustable temperature settings and built-in safety features like tip-over protection and overheat protection. Additionally, consider the type of heater that suits your preferences, such as ceramic, oil-filled, or infrared heaters.

Overall, the best indoor heaters for power outages are versatile and can be used in various small spaces, offering a reliable source of heat when electricity is unavailable.

How long can the best indoor heaters for power outages provide heat without electricity?

The duration for which the best indoor heaters can provide heat during a power outage without electricity depends on various factors, such as the type of heater, its fuel source, and the heating capacity. Generally, propane or natural gas heaters tend to have longer run times compared to electric heaters.

For example, a high-quality propane heater with a large tank can provide heat for up to 48 hours or more, depending on the heating settings and the size of the tank. On the other hand, electric heaters that rely on battery power or alternative power sources, such as generators or solar panels, may have more limited run times.

To ensure an extended heating duration during power outages, it is advisable to consider heaters with energy-efficient features, proper insulation in the room, and backup fuel supplies if using a non-electric heater. Additionally, it's important to follow safety guidelines and manufacturer instructions while using indoor heaters to prevent any accidents or carbon monoxide poisoning.

What are the top-rated indoor heaters for power outages?

When it comes to top-rated indoor heaters for power outages, there are a few options that are highly recommended by experts and consumers alike. One popular choice is propane heaters, particularly those designed for indoor use. These heaters are known for their high heat output and long burn time, making them ideal for providing warmth during power outages. Additionally, propane heaters are portable and easy to use, typically requiring only a propane tank and a match or ignition switch.

Another option to consider is a kerosene heater. These heaters are efficient and can provide a significant amount of heat, making them suitable for heating larger spaces. Kerosene heaters also have a long burn time and can operate without electricity. However, it's important to note that kerosene heaters should be used in well-ventilated areas and with caution due to the potential for carbon monoxide emissions.

Electric space heaters with battery backup or generators can also be a reliable choice for power outages. These heaters are energy-efficient and can provide a comfortable amount of heat. However, it's important to ensure that the battery backup or generator is properly maintained and has enough power to support the heater's operation.

Ultimately, the best indoor heater for power outages will depend on your specific needs and circumstances. It's always a good idea to read customer reviews, consult with professionals, and consider safety features when making a decision.

What features should I look for in an indoor heater for power outages?

When selecting an indoor heater for power outages, there are several important features to consider. First and foremost, it is crucial to choose a heater that operates on an alternative power source, such as propane or natural gas, as electricity may not be available during an outage. This ensures that the heater will continue to function even when the power is out.

Additionally, look for a heater with a built-in thermostat or temperature control feature, as this allows you to set and maintain a comfortable temperature in your space. Safety is also paramount, so opt for a heater with safety features such as tip-over protection and overheat protection, which automatically shut off the heater if it is accidentally knocked over or becomes too hot.

Portability is another factor to consider. Choose a heater that is lightweight and easy to move around, as you may need to relocate it to different rooms depending on your needs. Finally, consider the heating capacity and efficiency of the unit to ensure it can effectively heat the desired area. By considering these features, you can select an indoor heater that is reliable, safe, and suitable for power outage situations.

What is the heating capacity of the best indoor heaters for power outages?

The heating capacity of the best indoor heaters for power outages can vary depending on the specific model and type of heater. However, there are a few options that are known for their high heating capacity. One popular choice is a propane-powered heater, which can provide a substantial amount of heat during power outages. These heaters typically have a heating capacity of around 20,000 to 40,000 BTUs (British Thermal Units). Another option is a kerosene heater, which can also provide a significant amount of heat. The heating capacity of kerosene heaters can range from 10,000 to 23,000 BTUs. Additionally, electric space heaters with high wattage can also be effective in heating a room during a power outage. It's important to consider the size of the room you need to heat when choosing the best indoor heater for power outages, as well as safety features such as automatic shut-off and carbon monoxide detection.

Which indoor heaters are the most efficient during power outages?

During power outages, the most efficient indoor heaters are those that do not rely on electricity to function. Some options to consider include:

1. Propane heaters: Propane heaters are highly efficient and provide immediate heat without the need for electricity. They use propane gas as fuel and are known for their reliability during power outages. However, proper ventilation is crucial when using propane heaters to ensure safety.

2. Wood-burning stoves: Wood-burning stoves are an excellent option for heating during power outages. They use wood as fuel, providing both warmth and a cozy ambiance. However, they require a chimney or proper ventilation to release the smoke.

3. Kerosene heaters: Kerosene heaters operate without electricity and can be an efficient source of heat during power outages. They are easy to use and provide reliable heat. However, they should be used in well-ventilated areas to prevent carbon monoxide buildup.

It's important to note that safety measures should always be followed when using any type of indoor heater, and proper ventilation is crucial to prevent the buildup of harmful gases.