Illustration: the floor plan and yellow lines are schematic and do not constitute a heating or installation plan.
Calculating the output for infrared panels takes more than multiplying floor area by a number. Heat loss, use and placement must all align. We explain which mistakes you can avoid and which details are needed for a well-founded proposal.
Key points
Output in watts is not the same as energy consumption in kilowatt-hours. More output does not automatically mean higher or lower annual consumption. Start with the desired result and heat loss, then check distribution and controls and have the electrical capacity assessed.
Calculating infrared panel output from heat loss
To maintain a room temperature, the heating must be able to replace the heat lost. Those losses do not disappear because a panel emits radiant heat. Both infrared panels and ordinary radiators release heat through radiation and convection, in a ratio that depends on the version and conditions.
Insufficient output may mean the target temperature is not reached in cold weather. A larger panel can provide enough capacity, but does not fix poor insulation or unsuitable placement. Long operating periods alone do not prove a fault or incorrect efficiency; check the load and operating conditions in the documentation.
Calculating output: common mistakes
A fixed value per square or cubic metre can at most provide an initial indication. Two equally sized rooms may have different external walls, windows, ventilation and temperatures. An energy label or construction year does not replace an assessment of the particular room and later alterations to the building.
Another mistake is confusing output with coverage. A powerful panel behind a cupboard cannot direct heat to the seating area. Conversely, one locally warm zone does not automatically cover the entire heat demand. State explicitly whether you want primary heating or targeted supplementary heating.
Technical factors in the calculation
Gather dimensions and details of the floor, roof, external walls, windows and adjoining spaces. Insulation quality and temperature difference determine heat flow through the structure. Ventilation and unwanted air leaks also cause heat loss. A better window can reduce that loss; general claims about reflected infrared radiation do not replace insulation data.
Also record the target temperature and operating times. A short warm-up period requires a different assessment from maintaining a temperature continuously. Heavy materials affect warm-up time and store previously supplied heat, but provide no free energy. A wall’s visible colour does not reliably indicate how it interacts with thermal infrared radiation.
With high ceilings, distance from users matters as well as heat loss. Choose an appliance whose application, installation height and distribution suit the project. A fixed extra percentage or simply more watts is not a universal solution. Local radiant heating for workstations in a hall may be a different design task from heating the whole hall.
From information to a heating plan
1. Describe the desired result
Record each room’s dimensions, operating times, desired temperature and existing heating. Mark occupied areas, windows, doors and fixed furniture on a floor plan. Make clear which parts must always be warm and where extra comfort is only needed while people are present.
2. Have heat loss and placement assessed together
Have the relevant building data assessed and then choose a distribution that can meet the calculated objective. Multiple panels may improve coverage, but are not always better than one suitable panel. Check mounting instructions and obstacles; do not use one fixed radiation angle for all models.
3. Check the connection and controls
Add up the simultaneous electrical load and have the suitability of circuits, protection and switching components checked. A thermostat must be compatible and take representative readings. More installed output can increase peak load, even if the thermostat later switches off sooner.
Our advice for end users and partners
We support private and business end users, installation companies and wholesalers. Share photos, a floor plan and available insulation details so we can discuss the right next step. Where information is missing, a focused assessment may be needed before a reliable product choice is possible.
Check performance and costs after choosing
Compare purchase, installation and expected consumption with suitable alternatives. Distinguish one-off warming from prolonged use. Solar panels do not cover demand at every heating moment. Any subsidies or tax schemes must be checked for the specific measure, without treating them as certain beforehand.
Frequently asked questions
Does a larger panel save energy because it switches off sooner?
Not automatically. It provides more heat per hour and therefore also uses more electricity while operating. Total energy depends on heat demand, temperatures reached and control behaviour. A smaller appliance that fails to reach the desired temperature may use less energy while providing inadequate comfort; compare the same performance.
How do I convert watts to consumption?
Divide watts by one thousand for kilowatts and multiply by the actual operating hours at that output. One kilowatt for two hours is 2 kWh. Multiply by your own tariff for an indication of cost. Installed watts alone say nothing about annual consumption.