Room Heat Load Calculator
Calculate the heat load of a single room quickly and according to DIN EN 12831-1.
How the Calculation Works
The room heat load calculator determines the required heating capacity for a single room. It considers:
Transmission Heat Losses
Heat losses through external walls, windows, doors, ceiling and floor. The calculation is based on:
- U-values of building components
- Areas of building components
- Temperature difference between inside and outside (design outdoor temperature)
Ventilation Heat Losses
Heat losses through air exchange:
- Natural ventilation: Air change rate 0.5 /h
- Ventilation system with HRV: Air change rate 0.5 /h (with heat recovery)
- Airtight building: Air change rate 0.3 /h
Design Outdoor Temperature
The calculation uses the design outdoor temperature for your location according to DIN 4108-2. In Germany, this is typically between -10°C (mild regions) and -16°C (cold regions).
Typical Results
| Room Type | Specific Heat Load |
|---|---|
| Unrenovated old building | 80-120 W/m² |
| Renovated old building | 50-80 W/m² |
| New building (GEG) | 30-50 W/m² |
| Passive house | 10-15 W/m² |
Example: A 25 m² living room in a renovated old building with 60 W/m² has a heat load of 1,500 W (1.5 kW).
Further Information
Embed This Calculator on Your Website
Would you like to embed this room heat load calculator on your own website? Simply add the following code to your HTML:
<!-- Room Heat Load Calculator by PV-Calor -->
<ge-mini-raumheizlast lang="en"></ge-mini-raumheizlast>
<script src="https://www.pv-calor.com/user/plugins/gecomponents/assets/ge-mini-raumheizlast.embed.js"></script>Available languages: Change lang="en" to one of: de, en, fr, it, es, pt, nl, da, sv, pl, ru
Embedding is free. Contact us if you have any questions.