Short answer
An electric water heater that gives completely cold water and makes no sound has either lost power or lost a heating element. Check the breaker and the disconnect switch beside the tank first, because a tripped breaker or a switch knocked off is the most common cause and costs nothing to fix. If power is on and the water is still cold two hours later, the high-limit reset has tripped or an element or thermostat has failed, and that is a repair visit, not a new heater. Replace the tank only when it leaks from the tank itself.
Tell a power problem from a failed element in ten minutes
- Run the hot tap at a sink for a full minute and feel the water. Cold at every tap in the house points at the heater, not one fixture.
- Look at the tank for lights or a display. No lights at all on a unit that has them means no power is reaching it.
- Open the electrical panel and find the double breaker labelled for the water heater. If the handle sits between on and off, it has tripped.
- Reset that breaker once, firmly off then on. If it trips again straight away, stop and hire an electrician, because an element or the wiring is shorted.
- Find the switch or small breaker box on the wall beside the tank and confirm it is on. A painter or a cleaner knocks this off more often than you would think.
- On a heat pump water heater, check the mode on the panel. Vacation mode and a disabled upper element both leave you with cold water.
- Wait two hours with power confirmed on, then test the hot tap again.
If the water is hot after those two hours, the power was the whole problem. If the tank still gives cold water with the breaker and the switch on, the element, the thermostat or the high-limit reset has failed. Stop there. Do not open the access panels on the side of the tank. Those terminals carry 240 volts even while the water is cold, and that is the hire line on this job.
Repair or replace
| Situation | What to do |
|---|---|
| Breaker was tripped, resets, hot water returns in 2 hours | Nothing more. Note the date, because a second trip means a shorted element. |
| Breaker trips again the moment you reset it | Hire an electrician. An element has shorted to the tank or the wiring has failed. |
| Power confirmed on, tank under 12 years old, floor dry | Repair. Elements, thermostats and the reset are stock parts and a 2 hour job. |
| Heat pump unit under 5 years old, silent, no error code | Repair under warranty. Call the brand with the model and serial before anyone opens it. |
| Tank over 12 years old and cold, with rust at the fittings | Replace. Spending $500 on a tank at the end of its life buys you a year. |
| Water pooling under the tank as well as no hot water | Replace. A tank that leaks from the tank is never repaired, at any age. |
| Only lukewarm water, never fully cold | Repair. One of the two elements is still working, so a single part has failed. |
What it costs
Runhome contractor estimates to diagnose and repair an electric water heater that makes no hot water ran from $285 to $650, and a full replacement ran from $800 to $2,180, as of October 2026, including the trip and assessment.
| Option | Range |
|---|---|
| Diagnose and repair: element, thermostat and reset | $285 to $650 |
| Full replacement: new electric tank, removal and disposal | $800 to $2,180 |
Can I do it myself?
Only the power checks. Resetting the breaker, confirming the switch beside the tank is on, and changing the mode on a heat pump panel are all homeowner jobs, and they solve this symptom often enough to be worth ten minutes. Everything past that lives behind the access panels, where the element terminals carry 240 volts whether the water is hot or cold, and a failed element can energise the tank itself. Hire for this. A pro also tests both elements and both thermostats in one visit, so you do not replace a good part and keep the cold water.
What a contractor will ask you
Have these ready and you skip the back-and-forth.
- When the hot water stopped. Within the last week, or longer than that.
- Whether the water is completely cold all the time, or lukewarm and weaker than it used to be.
- Tank-style, tankless, or a boiler with a hot water tank.
- Gas or electric. Electric units have wires into the top or side and no burner or vent pipe.
- The age of the tank, as close as you can guess.
- Whether the floor around the heater is dry or wet.
- Any sound from the unit while you run hot water, humming, clicking, or nothing at all.
- Whether there is a dedicated switch or breaker beside the heater, and whether it stays on when you reset it.
- Whether the unit has lights or a display, and whether anything is showing on it.
- Brand and model off the label on the side of the tank.
- A wide photo of the heater taken a few steps back, showing the pipes on top and the floor.
Common questions
- Should I reset the breaker myself?
Yes, once. Push it fully off and then on, and leave it alone if it holds. If it trips again within seconds, the circuit has a fault and resetting it repeatedly damages the breaker.
- How long until the water is hot again after I restore power?
About 1 to 2 hours for a 40 or 50 gallon electric tank from completely cold. A heat pump water heater in heat pump mode takes 4 hours or more, so switch it to electric or hybrid mode while you test.
- My water heater is less than 2 years old and sits totally silent. Is that normal?
No. A heat pump water heater runs a fan and a compressor you can hear across the room, so silence with the breaker on means it is not running at all. Get the model and serial number and call the brand, because that is warranty work.
- Is it worth repairing a 10 year old electric water heater?
Yes, if the floor is dry and only the heating is dead. A $285 to $650 repair on a dry tank is cheaper than replacement, and elements fail long before tanks do. Replace instead once you see water under the tank or rust at the fittings.
- Could something other than the heater cause cold water everywhere?
Rarely, but yes. A failed mixing valve on the hot outlet or a crossed connection after recent plumbing work sends cold water to every tap while the heater works fine. Mention any plumbing done in the last month when you book the visit.