Some electric tanks use an upper and a lower heating element. A fault in the lower heating circuit can leave a small volume of hot water near the top while the rest of the tank remains cooler. Heater design, demand, and plumbing issues can produce a similar symptom.
Compare the first draw after recovery
Tell the technician whether the tank had time to recover before you ran out and whether every hot fixture behaves the same way. Mention recent changes in usage and whether a breaker has tripped. Leave electrical panels on the heater closed.
Ask how the heating circuit was checked
A technician can isolate power and test elements, thermostats, and wiring according to the model instructions. Ask which test supports the repair and how they will confirm the heater recovers normally after the work.
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