Heater Sizing Calculator
kW heat output needed for your van's volume and ΔT.
About the Heater sizing calculator
Use this heater sizing calculator for van heating, gas & ventilation. kW heat output needed for your van's volume and ΔT.
Enter your heater sizing details
Your heater sizing results
Interior volume
18.98 m³
Heat loss at ΔT
0.17 kW
ΔT = 22 °C
Recommended heater
0.2 kW
With 20% headroom
Why heater sizing matters for van heating, gas & ventilation
Plan with confidence
Getting your heater sizing numbers right early avoids costly rework, undersized components and surprises on the road.
Related heating, gas & air tools
Pair this with the rest of our heating, gas & air calculators to plan your full van conversion.
Heater sizing calculator FAQ
- What does the Heater Sizing Calculator do?
- kW heat output needed for your van's volume and ΔT. It is designed for van heating, gas and ventilation so you can plan with confidence.
- Is the heater sizing calculator free to use?
- Yes. All VanTools calculators, including the Heater Sizing Calculator, are free to use with no sign-up required.
- How accurate are the heater sizing results?
- Results are estimates based on the values you enter and standard van heating, gas and ventilation assumptions. Always sanity-check against manufacturer data and your real-world conditions.
- Can I share or save my heater sizing calculation?
- Yes. Use the Share button to copy a link that includes your inputs, or use Export to download a PDF or image of your results.