Electric water heaters rely on well-functioning heating elements to convert electrical energy into heat. A faulty element can affect how efficiently the heater operates, potentially changing electricity usage. This article explains how elements work, how to recognize a failing element, whether a bad element can raise energy consumption, and what to do to minimize costs and maximize efficiency.

Understanding How A Water Heater Element Works

Most electric water heaters use one or two immersion heating elements that run on 240 volts. Each element has a fixed resistance, which determines the current drawn when energized. When the thermostat calls for heat, the corresponding element turns on and heats the water inside the tank. The system cycles between heating periods and standby periods, maintaining the set temperature. Because the power draw is largely dictated by the element’s resistance and the thermostat control, any change in element performance can alter heating efficiency and total energy use.

Signs A Heating Element Is Failing

Common signs of a failing element include:

Inconsistent hot water or cold-water shocks in showers.
Longer heating cycles than typical, with water taking more time to reach the desired temperature.
Discolored water or mineral buildup around the element access panel.
Frequent tripping of the circuit breaker or blown fuses.
Element not heating at all when the thermostat calls for heat (open circuit).

Understanding these symptoms helps distinguish a faulty element from thermostat issues or sediment buildup, which can also degrade performance.

Does A Bad Element Use More Electricity?

The answer depends on the type of fault:

Shorted or low-resistance element: If an element’s insulation fails and its resistance drops, it can draw more current than designed, potentially causing higher electricity use or tripping the breaker. This is less common and dangerous, requiring immediate attention.
Open or high-resistance element: An open circuit prevents heating altogether. The heater may run more often to try to reach temperature, but it won’t add heat if the element is never energized. In this case, overall energy use may not rise and could appear unchanged until the thermostat reaches its limit or the water cools.
Sediment or mineral buildup: Deposits on the element reduce heat transfer efficiency. The heater runs longer to heat the same amount of water, increasing energy consumption modestly over time.
Thermostat or control issues: A malfunctioning thermostat can cause the element to heat more aggressively or stay on longer, raising energy use even if the element itself isn’t defective.

In practical terms, a truly defective element—especially one causing continuous current draw or frequent trips—can increase electricity use or lead to unsafe conditions. More commonly, diminished efficiency from mineral buildup or control faults drives up energy consumption because the system must work longer to reach target temperatures.

How To Test And Diagnose

Safe testing steps include:

Turn off power at the breaker before inspecting the unit.
Remove access panels and use a multimeter to check element resistance: a typical 4500W, 240V element should read about 10–15 ohms. Significantly lower or higher readings indicate a fault.
Inspect for visible damage, corrosion, or mineral deposits on the element and near connections.
Test the upper and lower elements separately by isolating one at a time and verifying heating behavior.
Confirm proper thermostat operation and check for sediment buildup in the tank, which can impede heat transfer.

If measurements fall outside manufacturer specifications, the element should be replaced. If testing reveals intermittent behavior or tripping without heating, a professional inspection is advised to rule out wiring or control problems.

Repair Or Replace: Costs And Considerations

Costs vary by tank size, element type, and labor. Typical ranges:

Element replacement: About $20–$60 for the part plus 1–2 hours of labor, depending on accessibility.
Professional service call: $100–$200 per visit, often with diagnostic fees.
Tank replacement: If frequent element failures occur due to aging tanks, replacement costs can be substantially higher.

When deciding, consider tank age, mineral hardness in the water, and ongoing energy bills. An older heater may become more energy-inefficient overall, making replacement more cost-effective in the long run. Regular maintenance, including flushing sediment, can extend life and improve efficiency.

Energy Saving Tips And Best Practices

Lowering energy use while maintaining adequate hot water involves several strategies:

Install a high-efficiency model or upgrade to a tankless system if appropriate for household hot water needs.
Maintain the current tank by flushing sediment at least annually to improve heat transfer.
Use insulation on the hot water pipes and, if possible, on the tank itself to reduce heat loss.
Set the thermostat to a moderate temperature (120°F is often sufficient for most households) to minimize energy use without sacrificing comfort.
Consider solar-assisted or heat-pump water heaters to reduce electricity consumption.
Schedule routine inspections to catch failing elements or thermostat issues early.

Efficient operation depends on both the integrity of heating elements and the overall system design. Addressing problems promptly minimizes unnecessary energy use and helps protect against safety hazards.