The cost to fix a water heater depends on what failed and how complex the repair is. Smaller repairs can involve replacing a thermostat, heating element, thermocouple, or pressure relief valve. More involved repairs may include ignition systems, gas control valves, leaks at fittings, or tankless components like sensors and flow controls. Access, unit age, and sediment buildup can also affect time and parts needed, which is common in Metro Denver. Done starts with a straightforward diagnosis, then explains the repair options clearly—so you can choose the best path to restore hot water without guesswork.