April 12, 2023

Guide to estimating far-infrared heater sizes

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When it comes to efficiently heating your home, Infracomfort far-infrared heaters offer a modern and effective solution. These heaters work by emitting far-infrared radiation, which is absorbed by objects and surfaces in the room, resulting in a comfortable, even heat distribution.

Choosing the right size heater is essential to ensure optimal comfort and energy efficiency. In this article, we will discuss the calculations and considerations needed to estimate the appropriate heater sizes for an average New Zealand home, targeted at DIY enthusiasts. We’ll provide examples of common room sizes and their corresponding heater wattages.

Understanding insulation levels

The first step in estimating the required heater size is to consider the insulation level of your home. Insulation plays a significant role in determining the amount of heat needed to maintain a comfortable temperature. Homes can be classified into three insulation levels:

  • Well-insulated: These homes have modern insulation materials and techniques, such as double-glazed windows, insulation in walls, floors, and ceilings, and proper draft-proofing.
  • Moderately insulated: These homes may have some insulation in walls and ceilings, but lack double-glazed windows or other modern insulation features.
  • Poorly insulated: These homes have minimal insulation and often suffer from drafts and heat loss.
Calculating heater wattage

To calculate the required heater wattage, we must know the room’s volume and the appropriate wattage per cubic meter (m³) for each insulation level. The wattage per m³ values for different insulation levels are as follows:

  • Well-insulated rooms: 18 watts per m³
  • Moderately insulated rooms: 20 watts per m³
  • Poorly insulated rooms: 24 watts per m³

To find the room’s volume, multiply its length, width, and height:

  • Volume (m³) = Length (m) × Width (m) × Height (m)

Next, multiply the room’s volume by the wattage per m³ value for the appropriate insulation level:

  • Total wattage = Volume (m³) × Wattage per m³

Finally, to be on the safe side, we will round up the total wattage to the nearest 100 watts to determine the optimal heater size needed.

Common room sizes in an average New Zealand home

Here are some common room sizes in an average New Zealand home. We will assume these rooms have a standard ceiling height of 2.4 meters:

  • Living room: 4.5m x 4.5m
  • Dining room: 3m x 3.5m
  • Kitchen: 3m x 4m
  • Master bedroom: 4m x 3.5m
  • Additional bedrooms: 3m x 3m
Far-infrared heater wattage examples

Using the calculations explained above, we can now estimate the required heater size in watts required for each of these common room sizes and according to their particular levels of insulation.

A. Living Room (4.5m x 4.5m x 2.4m)

  • Cubic volume: 48.6 m³
  • Well-insulated room: 900W
  • Moderately insulated room: 1000W
  • Poorly insulated room: 1200W

B. Dining Room (3m x 3.5m x 2.4m)

  • Cubic volume: 25.2 m³
  • Well-insulated room: 500W
  • Moderately insulated room: 600W
  • Poorly insulated room: 700W

C. Kitchen (3m x 4m x 2.4m)

  • Cubic volume: 28.8 m³
  • Well-insulated room: 600W
  • Moderately insulated room: 600W
  • Poorly insulated room: 700W

D. Master Bedroom (4m x 3.5m x 2.4m)

  • Cubic volume: 33.6 m³
  • Well-insulated room: 700W
  • Moderately insulated room: 700W
  • Poorly insulated room: 900W

E. Additional Bedrooms (3m x 3m x 2.4m)

  • Cubic volume: 21.6 m³
  • Well-insulated room: 400W
  • Moderately insulated room: 500W
  • Poorly insulated room: 600W
Alternative watt checker

To use this table, find the closest room size (m²) and/or corresponding volume (m³) for the room in question. Then, choose the appropriate insulation level column (well-insulated, moderately insulated, or poorly insulated) to find the recommended heater size in watts (W).

Room Size (m²)Volume (m³)Well-insulated (W)Moderately insulated (W)Poorly insulated (W)

Please note that this table is intended for general guidance only and may not cover every possible room size and volume. For a more accurate assessment of heating needs, consult with an Infracomfort heating professional.

Additional considerations

When estimating the required heater size, keep the following points in mind:

  • The calculations provided are based on average room sizes and standard ceiling heights, so it’s essential to use the specific dimensions of your home.
  • Infrared heaters work best when they have a clear line of sight to the objects and surfaces in the room. Make sure to consider the placement of the heater to maximize its effectiveness.

Estimating the appropriate far-infrared heater size for your home is essential to ensure optimal comfort and energy efficiency. By understanding your home’s insulation level, calculating the heater wattage based on the room’s volume, and considering the specific dimensions of your home, you can make informed decisions about heating your home, workplace or other spaces.

Remember to consult with an Infracomfort heating professional for personalized advice. With the right heater size in place, you can enjoy a warm and cozy living space during those chilly New Zealand winters.

Please note that the provided heater size estimates above are for general guidance only and are not intended to be definitive or final figures. Various factors, such as ceiling, wall, and floor insulation, the number and size of windows, room construction materials, and other elements may affect the actual heating requirements. For a tailored assessment and accurate recommendations, it is always best to consult with an Infracomfort heating professional before making any heater purchases.