A water heater that has power but no heat usually indicates a failure in the controls or in the part that actually makes heat (burner or electric element), not a household power issue. The most common real-world cause is a thermostat or safety cutoff preventing the unit from firing or energizing. In our work around the Blacksburg area, we often find simple protective trips behind a no-heat call, with repairs focusing on restoring safe operation. If the tank itself is leaking, replacement is the right next step; if controls or elements fail, repair is typical.
Check these before you call:
- Electric: high-limit switch tripped, burned-out element, or failed thermostat.
- Gas: unlit pilot/igniter issue or closed/failed gas valve.
- Tankless: clogged inlet filter, scale limiting flow, or a flow rate below the unit’s start threshold.
- Mixed-temp: a stuck mixing valve or crossover letting cold feed the hot line.
Turn off power or gas and water if you smell gas, see scorching, or the tank leaks, then schedule a professional diagnosis.
Updated: 2026-04-02
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