Sizing an infrared panel starts with its task. Must a room remain warm independently on a cold design day, or do you need temporary extra comfort in one spot? This determines the calculation and product data required.
This guide checks inputs, calculated output and layout. Correct sizing is not a fixed energy-label table or a promise that the same panel count gives identical comfort everywhere.
Check three different results
Distinguish required heating power, heat distribution and energy use over time. They are related but different. Watts express power; kilowatt-hours express energy. Positioning and controls belong alongside heat-loss calculation.
Shortfall and excess have different consequences
Insufficient power can prevent the target room temperature. It does not cause a structural thermal bridge, which is a construction property. Excess power can raise purchase cost and connection load but does not automatically imply a fixed extra annual consumption.
Building heat demand remains relevant for panels. Radiation and convection both transfer heat. Thermal mass affects timing but creates no additional heat and does not invalidate established heat-loss methods.
Collect building and usage data
Measure length, width and height and identify boundaries to outside or unheated spaces. Collect properties and areas of walls, windows, roof and floor. Ventilation and leakage also contribute to heat loss.
Define temperature and schedules. Design outdoor temperature belongs to the chosen assessment method and location; do not apply one winter value everywhere. Construction year, insulation thickness or label alone cannot describe complete demand.
High ceilings require heat-loss assessment plus permitted mounting and distance to the zone. Height is not simply a fixed percentage addition. Industrial use may need another heater type than a domestic room.
Check each step and its uncertainty
Start with a floor plan and identify known data for each component. Have missing properties assessed. A precise-looking final number remains an estimate if most inputs are assumed.
Use an appropriate heat-loss method for primary heating. One transmission relation is U-value × area × temperature difference, but the complete calculation includes more. Volume times an arbitrary watt factor is not a final design.
Translate capacity into approved models, clearances and comfort zones. Several panels may improve distribution, but two smaller units are not always technically better than one larger. Explain the layout.
Check controls and electrical capacity before ordering. Simultaneous load, outputs, circuits, cables and protection must fit together. A 3,600-watt threshold or fixed circuit advice is not universal installation guidance.
Define the heat being provided
Primary heating must independently heat agreed rooms under selected conditions. Assess individual rooms, but a gas-free home also needs other spaces and hot water considered. A panel does not supply domestic hot water.
Supplementary heat relates to background warmth and occupant position. Standard output under a desk or over seating does not suit everyone. Use equipment intended for that mounting and distance.
Reduce central temperature only where comfort, moisture and building use allow. A hybrid combination is not automatically most efficient. Calculate savings for the complete situation including local electricity.
Coordinate product selection and installation
Compare exact versions for size, weight, mounting and controls. Material or origin alone does not prove fixed warm-up, lifespan or lower use. Confirm protection, warranty and print or colour options.
We help private and business end users and supply installers and wholesalers. Share plans, photos, insulation and use. If data is insufficient, agree additional measurements or project-site assessment and responsibility.
Include the reasoning in the quote
Ask not only how many watts, but why that capacity and distribution were chosen. Record missing data, installation conditions and responsibilities. This supports assessment and later recalculation of changes.
Frequently asked questions about capacity
Can it work in a poorly insulated home? Local use may be possible, but full heating may require substantial electricity. More watts do not fix heat loss. Compare insulation and alternatives before sizing a whole home.
What does a 1,000-watt panel use? About 1 kWh for an actual hour at that power. Operating time is not universally twenty to thirty minutes per hour. Apply your tariff without assumed current rates or fixed maintenance savings.
Is bathroom sizing different? Temperature and usage may differ, but no fixed watt value suffices. Assess model, location, protection and connection too. Desired quick warming does not prove every panel achieves it within minutes.