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Follow the heating process.\n\nGas, electric, tankless, and boiler-fed heaters make hot water in different ways. The first checks are different too.\n\nTell us whether every hot tap is cold and when the problem started. The technician compares water leaving the heater with water arriving at the fixtures to locate the failure.\n\n[Match my heater type →](<https://mtnmanplumbing.com/water-heater-no-hot-water/#what-changes>)\n\n![Water heater marked during a failed-heater diagnosis in West Valley City](<https://mtnmanplumbing.com/wp-content/uploads/2026/05/failed-water-heater-diagnostics-west-valley.jpg.png>)\n\nWest Valley City field photo · The type of heater tells us where to start\n\nThe fastest way to narrow it down\n\n## Is it always cold, or does it turn cold later?\n\nThat answer narrows the problem fast. Next, identify the heater. The vent, access panels, gas control, or display will show whether we should follow a gas, electric, tankless, boiler, or fixture problem.\n\nPick your heater\n\n## What kind of heater is in the house?\n\n### Gas tank\n\nLook for the gas pipe and burner control. Some gas tanks use a fan and plastic venting; others use a metal vent. Photograph the label and full blink pattern so we can match the model.\n\n### Electric tank\n\nMany have two rectangular access panels and no exhaust vent. Tell us whether the water is completely cold or gets warm for a few minutes first.\n\n### Tankless\n\nWrite down the brand, complete model number, and exact code on the display. The model keeps us from reading the wrong manual.\n\n### A tank connected to the boiler\n\nThese use heat from the boiler. The trouble may be in the tank, pump, zone control, or boiler instead of a water-heater burner.\n\nField note · West Valley City\n\n## Recognize the gas-heating components.\n\nThe gas control near the bottom regulates fuel to the burner beneath the tank. Heat travels up through the central flue, and the metal vent carries exhaust outdoors. The technician follows that fuel, ignition and exhaust path when diagnosing a heating failure.\n\n![Conventional gas water heater inspected in West Valley City](<https://mtnmanplumbing.com/wp-content/uploads/2026/05/failed-water-heater-diagnostics-west-valley.jpg.png>)\n\nThe metal vent and lower gas control identify a conventional gas tank.\n\n![Electric water heater in a Salt Lake City closet](<https://mtnmanplumbing.com/wp-content/uploads/2026/05/salt-lake-city-electric-water-heater-before.png>)\n\nNo flue and two access panels tell us to check elements, thermostats, power, and wiring.\n\nRead the pattern\n\n## What the hot water does points us in the right direction.\n\nYou do not need to guess the failed part. Notice when the water turns cold and whether every fixture does the same thing.\n\n### Every faucet stays cold\n\nThe heater may have stopped heating. But a mixing valve can also send cold water through the hot pipes, or a hidden hot-water leak can use up the supply. We check whether hot water is leaving the heater before blaming a part.\n\n### Hot water fades too soon\n\nThe stored hot water may be running out faster than the heater can warm its replacement. An electric tank with a failed lower element heats less of its volume. A broken dip tube—the tube carrying incoming cold water to the bottom—can let cold water mix near the hot outlet.\n\n### Only one fixture is cold\n\nThat points away from the heater and toward the faucet, shower valve, or nearby piping.\n\nThe diagnostic path\n\n## Follow hot water from the heater to the tap.\n\nIf water leaves the heater hot but arrives at one shower too cool, check the path between them. The shower’s mixing valve blends hot and cold water, so a fault there can affect that shower while other taps work normally.\n\nObservations are clues; measurements distinguish causes.\n\n| What you notice | What it suggests | What separates the possibilities |\n| --- | --- | --- |\n| One shower stays cool; other hot taps work | A fixture control or mixing problem is more likely than complete heater failure. | Compare temperatures at several fixtures; assess the affected valve. |\n| Every fixture is cold | The heat source, controls, or a system-wide mixing problem needs investigation. | Compare heater outlet temperature with fixture temperature before selecting a part. |\n| An electric tank provides a little hot water, then cools | The upper portion may be heating while the lower portion is not. Demand or mixing can also explain it. | The technician tests power, thermostats and both heating elements to find which part of the heating sequence has stopped. |\n| A tankless unit starts, then stops | The point in the sequence where it stops matters. | Record flow, code and operating state; compare with the exact model’s procedure. |\n| A boiler-fed tank is cold | The tank depends on a separate boiler and heat-delivery circuit. | Check whether the control requests heat and whether that heat reaches the tank coil. |\n\n### Technician reasoning: why the lower element can shorten a shower\n\nMany electric tanks have two elements that heat one at a time. The upper thermostat heats the top of the tank first, then hands control to the lower thermostat. If the lower circuit fails, the upper portion can still provide a short hot-water supply. The model’s wiring diagram shows how its thermostats and safety controls connect.\n\nThe technician tests the power supply, thermostats and elements to locate the failure. Electrical resistance and insulation tests are made with the circuit safely isolated.\n\n [Rheem: how two-element electric tanks operate ↗](<https://cdn.globalimageserver.com/FetchDocument.aspx?ID=1a6eb4b9-583e-4133-aa7e-0292b344bfa6>)\n\n### What a plumbing crossover means\n\nAn unintended connection lets cold water enter the hot-water piping. A defective mixing valve can cause this without an external leak. A technician isolates sections to locate the path and checks that the isolation valve actually closes; otherwise the test can mislead.\n\n [Rheem: plumbing crossover ↗](<https://cdn.globalimageserver.com/FetchDocument.aspx?ID=ca478a6b-e8da-4442-840f-0f10dc941a41>)\n\n### Where these explanations come from\n\nRead the manufacturer and technical references behind this lesson. For service settings, open the manual for your full model number.\n\n- [Rheem: how two-element electric tanks operate ↗](<https://cdn.globalimageserver.com/FetchDocument.aspx?ID=1a6eb4b9-583e-4133-aa7e-0292b344bfa6>)\n- [Rheem: plumbing crossover ↗](<https://cdn.globalimageserver.com/FetchDocument.aspx?ID=ca478a6b-e8da-4442-840f-0f10dc941a41>)\n- [A. O. Smith: leaks, mixing problems and tank care ↗](<https://assets.hotwater.com/damroot/Original/10001/100263112.pdf>)\n\nRecent work, real homes\n\n## See this work in the field.\n\nOpen a job to see the equipment, the problem, and the finished work.\n\nNorth Salt Lake Bradford White Water Heater Swap in North Salt Lake\n\nNorth Salt Lake\n\nField log\n\n### [North Salt Lake Bradford White Water Heater Swap](<https://mtnmanplumbing.com/past-work-north-salt-lake-bradford-white-water-heater-swap/?agentnet=md>)\n\n**Open the job →**\n\nDowntown Condo Bradford White Swap and Floor Drain Clear in Salt Lake City\n\nSalt Lake City\n\nField log\n\n### [Downtown Condo Bradford White Swap and Floor Drain Clear](<https://mtnmanplumbing.com/past-work-downtown-condo-bradford-white-swap-and-floor-drain-clear/?agentnet=md>)\n\n**Open the job →**\n\n [See all recent water-heater work →](<https://mtnmanplumbing.com/past-work/?agentnet=md>)\n\nCommon questions\n\n## The questions we ask when the water stays cold.\n\n### Should I reset the water heater?\n\nPhotograph the code first. Reset only if your model’s user manual says to for that problem. If the fault comes back, stop resetting and have the cause checked.\n\n[Link to this answer](<https://mtnmanplumbing.com/water-heater-no-hot-water/#answer-should-i-reset-the-water-heater>)\n\n### Does no hot water mean I need a new heater?\n\nNo. Heating elements, thermostats, ignition parts, controls, and wiring can often be repaired. A leaking tank is a different story.\n\n[Link to this answer](<https://mtnmanplumbing.com/water-heater-no-hot-water/#answer-does-no-hot-water-mean-i-need-a-new-heater>)\n\n### What pictures should I send?\n\nSend the whole heater, the manufacturer label, and the control or display. Those three photos answer most of our first questions.\n\n[Link to this answer](<https://mtnmanplumbing.com/water-heater-no-hot-water/#answer-what-pictures-should-i-send>)\n\nRelated water-heater guides\n\n## Use the heater type and the symptom together.\n\n- [**Tankless error codes** Match the exact brand, model, and displayed code to the manual written for that heater.](<https://mtnmanplumbing.com/tankless-water-heater-error-codes/?agentnet=md>)\n\n- [**Age and serial number** Find the manufacturer label and use the brand-specific serial number to work out the age.](<https://mtnmanplumbing.com/water-heater-age-serial-number/?agentnet=md>)\n\n [Back to the complete water-heater guide →](<https://mtnmanplumbing.com/water-heater-repair/?agentnet=md>)\n\nReady to get the hot water back?\n\n## We can take it from here.\n\nSend one wide photo, the control or display, and whether the water stays cold or turns cold later. The plumber will see it before the visit.\n\n### Exclusive Offers\n\n  ● Active Specials\n\nMountain Man Plumbing deals and offers\n\nConnected in your home\n\n## Keep following the plumbing.\n\n- [01 **Water heater repair & learning hub →** Explore the heater’s parts and service options.](<https://mtnmanplumbing.com/water-heater-repair/?agentnet=md>)\n- [02 **Shower valve repair →** If other taps are hot, look at the shower’s mixing valve.](<https://mtnmanplumbing.com/services/shower-tub/shower-valve-repair/?agentnet=md>)\n- [03 **Tankless water heater error codes →** Look up the displayed fault on a tankless heater.](<https://mtnmanplumbing.com/tankless-water-heater-error-codes/?agentnet=md>)\n\n[Skip to Footer](<https://mtnmanplumbing.com/water-heater-no-hot-water/#mmp-footer>)\n\nMountain Man Plumbing  Sandy, Utah · Salt Lake Valley\n\n[Mountain Man Plumbing logo](<https://mtnmanplumbing.com/?agentnet=md>)\n\nYour local plumber\n\n## Let’s get it fixed.\n\nStrong values. 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