Electric water heater: no hot water
Standard residential electric tanks use two elements and two thermostats in non-simultaneous mode: the upper thermostat heats the top first, then hands power to the lower one. Totally cold water usually means a tripped high-limit (ECO), a dead upper element or a failed upper thermostat. Always find out why the ECO tripped before calling the job done.
Cross-checked ~60 min moderateBrands: All
Before you start
- 240 V circuit. Turn the breaker OFF and verify 0 V at the thermostat terminals with a meter before touching wires
- Live voltage checks are a caution step: insulated probes, one hand, stay clear of terminals
- Never energize an element unless the tank is completely full; a dry element burns out in seconds
- Scald risk: tank water can be very hot
- Many jurisdictions require a permit or a licensed plumber/electrician for water heater work; check local rules
Diagnostic steps
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