Thermal Mass Heater Calculator
Calculate thermal mass requirements, heat storage, release time, and room heating capacity for masonry and rocket mass heaters.
Inputs
Results
Heat release duration
17.7 hours
How to Use This Calculator
- Enter the total thermal mass weight in kg and select the material type.
- Set the wood burned per firing in kg and combustion efficiency percentage.
- Enter current room temperature.
- The calculator shows temperature rise, peak surface temperature, average heat output in watts, room area heated, and heat release duration.
- Use peak surface temperature to ensure it stays within safe touch limits and heat release hours to plan firing frequency.
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