No Hot Water? How to Tell Which Water Heater Element Failed
Most residential electric water heaters have two heating elements — an upper and a lower — each with its own thermostat. They don’t run at the same time: the upper element heats first, and only hands off to the lower once it’s satisfied. That’s useful, because which symptom you have points to which element failed.
No hot water at all
This usually points to the upper element (or its thermostat/high-limit switch). If the upper element can’t heat, the system typically never gets to the point of calling on the lower element either, so the tank runs cold.
Hot water that runs out quickly
A partial tank of hot water that runs out fast usually points to the lower element. The top of the tank is heating fine, but the lower portion isn’t being reheated as it’s used.
Check these two things first
Before you assume the element itself is bad:
- The breaker. A tripped breaker on the water heater’s circuit will produce identical symptoms to a failed element.
- The high-limit reset button. Many water heater thermostats have a red reset button that trips as a safety measure and needs to be manually pressed back in. It’s easy to mistake this for element failure.
Confirm it with a multimeter
Once you’ve ruled out the breaker and reset button, a multimeter confirms the element itself in under a minute — our general guide to testing a heating element with a multimeter covers the continuity, resistance, and ground-fault checks. For a healthy element’s expected reading, our element resistance calculator works out the ohms and current from the wattage and voltage stamped on the old element.
You don’t need to drain the tank for any of this — just disconnect the wires from the element’s terminals before testing.
Getting the right replacement
Once you’ve confirmed which element failed, you’ll need its wattage, voltage, and whether it’s a screw-in or bolt-in style — they aren’t interchangeable. Send us your tank’s brand and model, or a photo of the old element and its data tag, and we’ll confirm the exact match on our water heater elements page — get a quote and we’ll ship it across Canada.
Frequently asked questions
- Do I need to drain the tank to test an element?
- No. Testing an element's resistance or continuity only needs the wires disconnected from its terminals — you don't need to drain the tank unless you're removing the element itself.
- Can just one element fail while the other is fine?
- Yes — that's the most common case. The two elements and thermostats work independently, so it's normal for one to fail while the other keeps working.
- Should I replace both elements at once?
- Not necessarily. If only one has failed and the other tests fine, replacing just the bad one is enough. Some people replace both if they're the same age, to avoid a second repair soon after.
Related guides
Related products
- Water Heater Elements
- Reliance Water Heater Replacement Elements
- Giant Water Heater Replacement Elements
- Rheem Water Heater Replacement Elements
- A.O. Smith Water Heater Replacement Elements
Need a replacement element? We ship across Canada and build custom elements for hard-to-find equipment.