A large room is where a space heater can run up the electric bill, because it runs longer to reach the set temperature. The most energy efficient heaters for big rooms cut that run time: ECO modes that step down near the set point, programmable schedules, fanless convection that spreads heat evenly, or infrared that warms the people in the room instead of all the air. These five do it best.
We compared ECO features, thermostats, heat type and coverage using manufacturer specifications and owner feedback. For scored reviews see space heater for large room energy efficient reviews; our Editorial Policy explains our process.
Top 3 Best Energy Efficient Large Room Heaters
De’Longhi HCX9115E 1500W Convection Panel Heater with ECO Plus
- ECO Plus
- Convection
- Wall mount
Ballu Pro 1500W Smart Convection Heater with Programmable Thermostat
- Programmable
- Wi-Fi
- Fanless
Heat Storm HS-1500-ILODT Infrared Quartz Cabinet Heater
- Quartz
- Thermostat
- Remote
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Energy Efficient Large Room Heaters Compared
| # | Product | Key Features | |
|---|---|---|---|
| 1 |  De’Longhi HCX9115E 1500W Convection Panel Heater with ECO Plus |
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| 2 |  Ballu Pro 1500W Smart Convection Heater with Programmable Thermostat |
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| 3 |  Uthfy 26″ 1500W Mica Panel Heater with 3-Side Heating |
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| 4 |  Heat Storm HS-1500-ILODT Infrared Quartz Cabinet Heater |
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| 5 |  Comfort Glow QTH350 Infrared Quartz Heater with Reflector |
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1. De’Longhi HCX9115E 1500W Convection Panel Heater with ECO Plus
Best Overall
- ECO Plus automatically adjusts heat and power
- Fanless convection panel
- Floor or wall mounting kit included
- Thermal shutoff and tip-over switch
- LED digital display
- Rated for about 300 sq ft
- No app
- Type: convection panel, 120V
- Power: 1500W
- Model: HCX9115E
De’Longhi’s ECO Plus picks the lowest power setting that holds your temperature, which is how a panel heater saves energy in a big room.
Wall mounting frees floor space and spreads warm air from higher up.
Who the De’Longhi convection panel fits best
Living rooms with central heat.
Who should skip the De’Longhi convection panel
Users who want app control.
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2. Ballu Pro 1500W Smart Convection Heater with Programmable Thermostat
Best Smart Scheduling
- Programmable thermostat
- Wi-Fi app and remote with display
- Fanless aluminum element
- Child lock, tip-over and overheat protection
- 2-year warranty (per maker)
- About 250 sq ft rated
- App setup takes time
- Type: convection, 120V
- Power: 1500W
- Model: NCA1-4.6-PRO
Ballu’s schedules mean the heater only runs when you are home.
The remote reads the temperature where you sit for more accurate control.
Who the Ballu Pro convection fits best
People with set routines.
Who should skip the Ballu Pro convection
Users without Wi-Fi.
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3. Uthfy 26″ 1500W Mica Panel Heater with 3-Side Heating
Best Mica Panel
- Three-side mica heating
- High/low plus ECO mode
- 12 h timer
- Child lock, silent
- Floor unit
- About 300–400 sq ft
- Type: mica panel, 120V
- Power: 1000/1500W
- Model: JH-DRM01-15R
Uthfy’s mica panel radiates and convects heat from three sides for even warmth.
ECO mode adjusts power to hold temperature.
Who the Uthfy 26″ mica fits best
Bedrooms and living rooms.
Who should skip the Uthfy 26″ mica
Tight spaces.
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4. Heat Storm HS-1500-ILODT Infrared Quartz Cabinet Heater
Best Infrared
- Infrared quartz element
- Digital thermostat with LED display
- Remote and child lock
- Power outage recall
- Lifetime air filter
- Cabinet style
- Primary coverage about 300 sq ft
- Type: infrared quartz cabinet, 120V
- Power: 1500W (5,200 BTU)
- Model: HS-1500-ILODT
Heat Storm’s infrared cabinet warms people and objects, which feels warm sooner in a drafty large room.
The thermostat cycles it off once warm.
Who the Heat Storm infrared cabinet fits best
Drafty large rooms.
Who should skip the Heat Storm infrared cabinet
Wall mounting.
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5. Comfort Glow QTH350 Infrared Quartz Heater with Reflector
Best Simple Radiant
- Dual quartz elements
- Curved reflector directs heat
- Tip-over and overheat shut-off
- Carry handle
- About 250 sq ft
- Manual controls only
- Type: infrared quartz, 120V
- Power: 1500W (5,120 BTU)
- Model: QTH350
Comfort Glow’s reflector aims heat at you, so you can keep the room thermostat lower.
It is light enough to move to wherever you sit.
Who the Comfort Glow QTH350 fits best
Spot heat in big rooms.
Who should skip the Comfort Glow QTH350
Whole-room heating.
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How to Choose an Energy Efficient Large Room Heater
- ECO modes: step down power once warm.
- Schedules: heat only when you are home.
- Heat type: convection for even heat, infrared for people.
- Room prep: close doors and seal drafts.
Frequently Asked Questions
What is the most energy efficient heater for a large room?
The De’Longhi HCX9115E with ECO Plus is our top pick.
Is infrared or convection better?
Convection for even heat, infrared for drafty rooms or spot heat.
Does a programmable thermostat save energy?
Yes, by avoiding heat when nobody is home.
How many watts for a large room?
1500W supplements central heat; very large rooms may need two units.
Final Verdict: Best Space Heater for Large Room Energy Efficient
The De’Longhi HCX9115E is the best energy efficient large room heater. The Ballu Pro is best for smart scheduling, and the Heat Storm cabinet is the best infrared choice.
Overall: De’Longhi HCX9115E 1500W Convection Panel Heater with ECO Plus Check Latest Price
Smart scheduling: Ballu Pro 1500W Smart Convection Heater with Programmable Thermostat Check Latest Price
Infrared: Heat Storm HS-1500-ILODT Infrared Quartz Cabinet Heater Check Latest Price
Heat smarter, not longer.
Looking for something else? Browse all of our Heaters guides and the wider Heating & Cooling section.
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