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Calculate Power of an Infrared Heater

Calculation of the required power of an infrared heater in watts from the room size and height. The preset value of 20 watts per cubic meter applies to well-insulated rooms when the infrared heater is used as the only heat source. As auxiliary heater, it can be weaker (about half as much), with poor insulation more watts are required.

Living area:		m²
Ceiling height:		m
Living space:		m³
Power per cubic meter:		W/m³
Heating power:		watts

Please enter the living area in square meters and the average ceiling height in meters, or the living space in cubic meters. The required performance of the infrared heater to heat the room is calculated.

Electricity Costs of an Infrared Heater

Infrared heating is an economical and effective way of heating with electricity, it can be cheaper than other means of heating. This should be calculated by experts. An electricity meter can easily be connected upstream of an infrared heater, which precisely determines its consumption.

Costs by duration

Heating power:		watts
Heating duration:	d h m
Electricity price:		cents/kWh
Used electricity:		kWh
Electricity costs:		€/$

Please enter output and heating duration in days (d), hours (h) and minutes (m).

This calculator can be used to estimate the annual consumption and costs of a heating system:

Annual costs

Heating power:		watts
Heating duration per day:		hours
Heating season :		months
Electricity price:		cents/kWh
Used electricity:		kWh
Annual costs:		€/$

Please enter the power of the infrared heater, the average daily running time and the length of the heating period. Change the electricity price to your own value. It is calculated how many kilowatt hours of electricity per year are consumed by the heating and what this costs.

Infrared radiation is sometimes also called thermal radiation. Matter that has a temperature emits electromagnetic radiation. When matter is very cold, a few degrees above absolute zero, this radiation is in the microwave range. If the matter is hot, above several hundred degrees Celsius, visible light is already emitted and the matter glows. Temperatures in between cause the emission of infrared radiation, which can be seen as invisible light, in the spectrum lower than red, i.e. infrared. Put simply, an infrared heater is a piece of metal that is heated to a temperature of around 90 degrees Celsius. This radiation penetrates air and glass fairly well, heating the opposite wall. That's why there shouldn't be a window across from it, otherwise the heat will go out the window.

An infrared heater (500 watts) as a picture, mounted on the wall.


An further infrared heater (450 watts) in the bathroom. This is not mounted, but stands loosely on a brick to protect the wood of the bathroom cabinet.


Infrared heater (450 watts) mounted on the wall in the bedroom.

Photos: view from Alpspitz, fishing boats at Grüntensee, reed

Thermal images of the infrared heaters:





Here you can convert metric units into customary and imperial units and convert temperature units.

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