How to Select the Right Radiator Power for Your Home?

A simple guide to help you calculate and choose the ideal radiator power for every room.

To maintain comfortable, even heating without wasting energy, it’s important to choose a radiator with power output suited to each specific room. A radiator that’s too weak will struggle to heat the space and will operate at maximum capacity all the time, potentially stressing the electrical system. A radiator that’s too strong will cost more and take up unnecessary space. Here’s how to find the right balance.

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Why Choosing the Right Power Matters

Selecting a properly sized radiator ensures:

• Stable comfort: heat spreads evenly throughout the room.

• Lower energy bills: no excessive consumption.

• Longer lifespan: the radiator runs efficiently rather than overworking.

  
  

Step 1: Measure the Room Volume

Measure the room’s length, width, and height, then multiply the three numbers to calculate the volume in cubic meters (m³).

Example: 4 m × 3 m × 2.5 m = 30 m³

Step 2: Assess Insulation and Orientation

Heating needs vary depending on insulation quality and how the room is exposed to sunlight:

• Modern, well-insulated homes: about 30 W/m³

• Older or poorly insulated homes: up to 45 W/m³
  

Step 3: Use the Calculation Formula

Required power (W) = Room volume (m³) × Coefficient (W/m³)

Example: 30 m³ × 30 W/m³ = 1050 W

Step 4: Adapt to the Room’s Function

• Bedroom: prioritize steady, gentle heating.

• Living room with large windows: add extra power to offset heat loss.

• Bathroom: choose a quick-heating radiator for fast temperature rise.

In most cases, it’s wise to add a 5–10% margin to handle very cold days.

At Fogo, our radiators come in a wide range of power levels, colors, and finishes to complement every interior.Our experts can help you determine the ideal power for each room and create a heating setup perfectly suited to your home and lifestyle.