Immersion Heater Sizing

Size the kW needed to heat a tank by volume, temperature rise, and time.

Fluid

Volume to heat (US gallons)

Temperature rise ΔT (°F)

Heat-up time (hours)

Safety margin (%)

Recommended heater

11.7 kW

Energy required66,720 BTU

Base power9.8 kW

With 20% margin11.7 kW

First-order estimate for heat-up only (no heat loss / maintenance load). Watt density must also be checked against the fluid — talk to an engineer before ordering.

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