No hot water feels like an emergency, but the cause is almost always on a short list. Work through this page in order. If you smell gas at any point, stop, leave the house, and call 911 or your gas utility.
Step 1: Read the Pattern
The pattern is the first clue, and it is free:
- No hot water anywhere: power, pilot, upper element, or gas control — the heater is not heating at all.
- Runs out fast: lower element (electric), heavy sediment, or a broken dip tube — the heater works, but delivers less.
- Lukewarm, never hot: thermostat fault, a scaled tankless unit, or sediment insulating the tank floor.
Step 2: Electric Heaters — Power First
Check the breaker. A tripped water heater breaker gets one careful reset: fully off, then on. If it trips again, leave it off — a shorted element is the usual reason, and repeated resets will not fix it.
Next, with the power off, open the upper access panel and press the red high-limit reset button. If it clicks and heat returns within the hour, watch it: a reset that trips again means an underlying fault. The full electric fault list — and how each part is tested — is on our electric water heater repair page.
Step 3: Gas Heaters — Pilot and Control
Look through the sight glass: is the pilot lit? Relighting instructions are printed on the tank's label — follow them exactly, and never relight if you smell gas. A pilot that lights but will not stay lit usually means a failing thermocouple; a pilot that will not light at all can be the gas control valve itself.
Also check the temperature dial has not been knocked down, and that the gas supply valve is open. Simple, but it rules out the embarrassing causes before the expensive ones.
Step 4: Tankless Units — Read the Code
A tankless unit with no hot water is almost always displaying an error code. Write it down before resetting anything. In Kyle, the code trail usually leads to scale restriction or ignition trouble — both covered on our tankless repair page.
Step 4½: Only One Tap Affected?
If a single shower or faucet has lost its hot water while the rest of the house is fine, the water heater is almost certainly innocent. Single-fixture problems live at the fixture: a failed shower mixing cartridge, a blocked aerator or showerhead, or a shut-off valve at that fixture left partly closed after other work. Check the simplest fixture causes first — it saves a service call for a problem a cartridge solves.
Lukewarm Is a Clue, Not a Verdict
Water that heats but never gets hot enough narrows the field in a useful way. On an electric unit it usually means one element is doing all the work, or a thermostat is reading wrong. On a gas unit, check the dial position first, then suspect the thermostat inside the gas control. On any tank, a broken dip tube dilutes the hot outlet with incoming cold — the tank is hot, the tap is not. And in Kyle, sediment insulating the tank floor produces exactly this symptom for months before anything fails outright, which is why the flush in our maintenance guide is a heating fix as much as a cleaning one.
Step 5: The Flooded Heater Rules
If the heater has sat in water — a burst pipe, a flooded garage, storm water around the base — the rules change completely. Do not relight it and do not switch it back on.
Gas control valves and electrical components that have been submerged are damaged in ways drying does not undo, and manufacturers direct that flooded controls be replaced. Turn off the gas or power and the water supply, photograph everything for your insurer, and get the unit assessed. A flooded heater is usually a replacement conversation, and pretending otherwise is how a wet heater becomes a dangerous one.
When the Problem Is the Tank Itself
Water pooling under the unit, rust streaking the tank's base, or a heater that pops and rumbles constantly: those are not heating faults, they are tank faults. Our warning signs guide separates the two — read it before booking a repair that cannot hold.
What a Professional Checks That This Page Can't
The steps above cover everything checkable by eye and by hand. What they cannot do is measure. A professional visit adds a multimeter on elements and thermostats (proving a part dead rather than suspecting it), a check of gas supply and manifold pressure on gas units, combustion and venting inspection, and a pressure reading that can expose a failing expansion tank behind repeated T&P discharges. That measurement step is the whole difference between a diagnosis and a hunch — and it is why a good repair quote follows testing, not the other way round.
Get Help in Kyle, TX
Worked the steps and still cold? Call (512) 254-7634 and tell us the pattern and your heater type. Kyle Water Heater Pros will test what is left, quote the repair, and get your hot water back.