Wall Heater Buyer's Guide

Electric wall heaters provide room-by-room (or zoned) heating without adding ductwork. Whether you're replacing an old unit or adding extra warmth to a bedroom, bathroom, or office, start by matching the unit's heating output, electrical requirements, and installation type to your space.

Before buying an electric in-wall heater, consider these 3 essentials:

• Room requirements: Consider square footage, insulation, ceiling height, and whether the heater will offer primary or supplemental heat.
• Heater features & compatibility: Determine wattage, voltage, thermostat options, mounting requirements, and brand-specific safety clearances.
• Total Cost: The price of your heater includes its purchase price, installation, and expected operating cost.

The right wall heater should deliver the heat your room needs, work with your available electrical supply, and offer convenient temperature controls. This wall heater buyer's guide explains how to compare sizes, features, and costs so you can choose the perfect model for your space and budget.

A wall heater mounts flush in (or on) a wall and is hardwired to a dedicated circuit. Because wall heaters don’t need ductwork, they are fast, cost-effective ways to heat individual rooms. Use electrical wall mounted heaters in bathrooms, small bedrooms, and office suites without expanding ducted HVAC systems.

Read our blog about the pros and cons of wall heaters to learn more about what wall heaters are.

Wall heaters take in the surrounding cool air and warms it using an internal heating element. The heated air is then released into the room until the desired temperature is reached.

Use the chart below to choose wattage, voltage, and control type quickly. As a rule of thumb: use 10W/sq.ft for average insulation (increase this amount in corner rooms, high ceilings, or rooms with poor insulation)

DISCLAIMER: Actual heat coverage depends on heater make and model. Refer to the unit's user manual for specific heating guidance.

Protect your bathroom, garage, or outdoor outlets with weatherproof GFCIs that meet code and keep your space safe.

The total cost of an electric wall heater depends on the unit and installation requirements:

• Heater Type and Wattage: Higher output models and advanced controls may increase the unit purchase price. On average, high-output units have a higher upfront cost.
• Installation: One-for-one replacements are usually simpler and more affordable. A complete replacement, new wiring, a dedicated circuit, or wall modifications will add to labor costs.
• Room Requirements: Larger, draftier, or poorly insulated rooms may need a higher-wattage heater.
• Removal and Disposal: Replacing an existing heater can include removal and disposal fees.
• Time of Year: In fall and winter, demand for heater installation is higher. This often leads to higher labor costs.
• Operating cost: Electricity use depends on the heater’s wattage, runtime, and local electricity rate.

Estimate operating cost with this formula: Heater kilowatts × hours of operation × electricity rate per kWh

Overall, a wall heater and professional installation may total approximately $400 to $1500. However, treat this as a budgeting guesstimate, not a guaranteed price. Electrical work, permits, removal, and labor rates can vary significantly.

Most wall heaters use wiring for the voltage and thermostat. For the voltage, you will find that smaller heaters use 120V, which is a three-wire cable. However, there are also 240V wires. This voltage is for more powerful heaters.

Thermostats can either be line voltage or low voltage.

Line voltage:

• Single-pole (SP) Thermostats: Shuts off power on one side of the circuit. The heater still has a live wire when turned to the “off” position.
• Double-pole (DP) Thermostats: Disconnects power on both sides of the circuit. Completely cuts electricity to the heater, recommended for 240V units and a true-OFF position.
• Most common type used in electric wall heaters

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Low-voltage:

• Uses thinner wiring than line voltage counterparts
• Requires a transformer or relay kit to control the heater’s higher voltage circuit safely
• Normally used with central controls or building automation systems

Visit our blog going over the difference between Built-In and External Thermostats to learn more!

• Connect to a dedicated circuit sized to the heater’s amperage (apply the 80% rule per local code).
• Wire gauge: Use 12 AWG on a typical 20A circuits; for 30A circuits use 10 AWG (verify with nameplate).
• Voltage: 120V for small rooms; 240V for higher output/longer runs.
• Bathroom/near-water: follow local code and GFCI requirements.
• Hard-wired: In-wall fan heaters do not plug into outlets; they are wired to the panel using a wall can/box.

Tips for professionals

• Rough-in: Verify the wall-can cutout and clearances from flooring and adjacent surfaces
• Load calc: Confirm the electrical panel capacity before adding multiple heaters
• Label, Label, Label: Mark breaker and thermostat locations, record each setpoint for occupants
• Noise Reduction: Check sone and airflow (especially important in offices and classrooms
• Controls: Install vacancy sensor or programmable thermostats to cutdown runtime in unoccupied spaces

When installing a wall heater follow the checklist below:

1. Confirm square footage, voltage, & amperage
2. Pull correct gauges and install a dedicated breaker
3. Set clearances and install wall can at level
4. Make splices per manufacturer; torque lugs as specified
5. Mount heater & grille; verify fan rotation and element alignment
6. Wire thermostat (SP/DP line-voltage or low-voltage and relay)
7. Test: press to call for heat, verify the cut-out at the install point
8. Label the circuit; note amps/volts/model for service model

Wall heaters are a great way to keep warm in specific rooms without heating the whole house. They come with modern technology and use thermostats and wiring to help warm the area. To learn more about wall heaters as a whole, check out our Master Guide blog!

If you are looking for other ways to stay warm around your home, check out baseboard heaters, patio heaters, and gas fireplaces! You can also find electric wall heaters and ACs, also known as mini-splits as well! For kitchens/vanities, add supplementary kickspace heaters.

Call today for contractor pricing and pallet discounts!