Heat Loss Calculator | BoilerFix AI

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Room Details

Room Name

Room Length (m)

Room Width (m)

Room Height (m)

Temperature Settings

Target Room Temperature (°C)

Living rooms: 21°C, Bedrooms: 18°C, Bathrooms: 22°C

Outside Design Temperature (°C)

UK typical: -1°C to -3°C

External Walls

Total External Wall Area (m²)

Measure all external walls, minus windows/doors

Wall Type

Windows & Doors

Total Window Area (m²)

Window Type

Total Door Area (m²)

Standard door: ~2m²

Door Type

Floor & Ceiling

Floor Location

Ceiling Location

Ventilation

Air Changes Per Hour (ACH)

Measures how often room air is replaced per hour

BS EN 12831 Standard:
This calculator uses UK building standards to estimate room heating requirements. Results are approximate and should be verified by a qualified heating engineer for final system design.

Heat Loss Calculation Results

Total Heat Loss

- W

(- kW)

Fabric Heat Loss

- W

Ventilation Heat Loss

- W

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