The required infrared heating output cannot reliably be determined from one standard figure per square or cubic metre. Start with heat loss and room usage, then select models and positions that suit the plan.
This guide explains which details to collect and how to assess an output proposal. An initial estimate can start the discussion, but is not a final installation design or a guarantee of annual consumption.
What a calculation needs
Define primary heating or local supplementary heating. Collect dimensions, insulation data, windows, ventilation, target temperature and occupancy times. Then check heat distribution, controls and the electrical supply. Watts describe power; kWh describes consumption.
Why selecting a panel is not enough
For primary heating, the installation must heat the agreed rooms under the chosen design conditions. Insufficient output may prevent the target temperature from being reached. This does not prove that the panel automatically wears out faster; that requires specific product evidence.
For supplementary heating, define the zone, occupancy position and contribution from existing heating. Warmth at a desk does not mean the whole room stays at temperature. Specify what you expect the selected unit to achieve.
From room data to heat loss
Measure dimensions and volume, but also record external wall, roof, floor and glazing areas. Their thermal properties and temperature differences to outdoors or adjacent spaces affect heat loss. Ventilation and air leakage also need consideration.
A common form for transmission heat loss is U-value × area × temperature difference. This is only one part of the complete calculation. Use reliable inputs and have missing information assessed; different components have different thermal properties, and an Rc value is not directly a U-value.
A fixed watts-per-cubic-metre table is at most a rough screening tool. Construction year, external-wall count or “average insulation” do not uniquely establish demand. A fixed percentage allowance cannot replace investigation of actual conditions.
Living room, bathroom, bedroom and workstation
In a living room, layout and occupancy help determine where comfort is needed. An open kitchen also requires assessment of extraction and air exchange. State which doors usually remain open and whether spaces are heated together or separately.
A bathroom may have a different target temperature and short usage periods, but no universal wattage follows. Assess the exact position, permitted use, protection and electrical connection together. An IP rating alone does not guarantee safe installation anywhere.
For a bedroom, define your intended use and comfort; a panel does not guarantee healthy sleep. At a workstation, local support may be useful. Match positioning and distance to the exact unit and avoid excessive or uneven heat.
Assess heat delivery and positioning
An infrared panel emits radiant and convective heat. Material, construction and surface temperature influence its behaviour. A larger radiant share does not prove that the same building needs less heat. Compare measurements for specific models.
Permitted wall or ceiling mounting, distance to occupants and furniture affect the surfaces reached. There is no universal radiant angle or three-metre range limit for all products. Tall halls may need a different type of heater from a home.
Heat storage in walls and floors can affect response but supplies no free energy. Glazing, curtains and furniture also need situation-specific assessment. Material alone cannot justify a fixed floor-temperature increase or guaranteed savings.
From required output to a workable plan
Distribute the required output across suitable models and check comfort zones. Several panels may improve distribution, but are not necessarily better than one unit in every room. Consider clearances, structural support, cable routes and accessible controls.
Have simultaneous total load, circuits, wiring, protection and thermostat outputs assessed together. A generic current rating is insufficient for safely allocating circuit capacity. Excess output is not automatically economical and can increase connection load and costs.
Have the assumptions checked
We help private and business end users select products and support installers and wholesalers. Send a floor plan, photos and available insulation data. State which information is uncertain and whether you need primary heating or local support.
Frequently asked questions about output
Is 1,000 watts enough for my living room? This cannot be established without heat-loss data and intended use. Provide dimensions, insulation, glazing, ventilation and target temperature. Total output and distribution can then be assessed together.
How do I calculate consumption and costs? Divide watts by one thousand for kilowatts and multiply by actual operating hours for kWh. Only then multiply by the tariff for variable costs. A thermostat has no fixed universal on/off ratio.
Does single glazing matter? Yes, glazing properties and area contribute to heat loss. The term single glazing does not establish a fixed wattage or universal positioning ban. Assess insulation measures and panel position as part of the whole plan.