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Electric Tankless Amps Calculator
Quick answer: Amps = (kW × 1,000) ÷ volts. Example: a 27 kW electric tankless on 240 V draws about 112.5 A — often requiring multiple dedicated circuits and possibly a panel upgrade.
Estimates for planning only — not professional, engineering, plumbing, gas or electrical advice. Confirm sizing, venting, gas and electrical with a licensed installer and local code. A licensed electrician must confirm panel capacity.
Worked example
Figures below are illustrative examples (2026-10-29), not quotes or guarantees.
18 kW ÷ 240 V = 75 A; 36 kW ÷ 240 V = 150 A. These are load estimates only — breaker and wire sizing is a licensed electrician's job.
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