Calculators
Electrical Heater Sizing
Electrical duty, gross power (with margin and efficiency), full-load current, and element count for an industrial circulation heater. Rebuilt from Electrical_Heater_Sizing_v3.xlsx — element count uses CEILING(P/1200) (v3 fix: ROUND zeroed for <600 kW).
Formulas: Q = Ḵ·Cp·ΔT; gross kW = Q·(1+margin)/η; I = P×1000 / (V·PF·√3). Standards: UL 875, NEC Articles 424 & 427, NFPA 70, ASME BPVC Section I (if pressure vessel). v3 fix: element count uses CEILING (prior ROUND returned 0 for duties <600 kW). Watt density values are screening-only — confirm with vendor for the actual fluid and element design.
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