Why Does My Hot Water Run Out So Fast?

Sediment: The Phoenix Special

Phoenix water carries dissolved minerals that drop out when heated and settle on the bottom of the tank. A few years of that and you can have several inches of sediment down there. That sediment does two things. It takes up space, so a 50-gallon tank might only hold 40 gallons of water. And on a gas heater it sits between the burner and the water, so the burner runs longer to heat less. You may also hear popping as water boils through the sediment.

A flush often helps if it is caught early. If the tank has never been flushed and it is past eight years old, the sediment may be too hardened to remove, and that changes the conversation.

The Broken Dip Tube

The dip tube is a plastic pipe inside the tank that carries incoming cold water down to the bottom, so the hot water stays at the top where the outlet is. When the dip tube cracks or breaks off, cold water pours in at the top and mixes with your hot water right away. The tank is full of warm water instead of hot, and the shower goes lukewarm within minutes. It is an inexpensive part, and replacing it is a normal water heater repair we finish in one visit.

Electric Heaters: The Lower Element

Electric tanks have two heating elements, upper and lower. The lower one does most of the work. When it burns out, the upper element still heats the top of the tank, so you get a few minutes of hot water and then nothing. It is one of our most common calls, and it is a part swap. If both elements test fine, the lower thermostat may be the culprit.

Sometimes the Tank Is Just Too Small

A 40-gallon tank that was fine for two people gets overwhelmed when the kids become teenagers, a parent moves in, or you add a soaking tub. If the heater is working correctly and you still run out during normal use, the fix is capacity, not repair. That can mean a larger tank, a higher-recovery model, or a tankless water heater that never runs out as long as it is sized for your flow.

A Glendale Family Who Thought They Needed a New Heater

A family in Glendale texted us photos of their eight-year-old gas water heater and said they were ready to replace it because the hot water was gone after one shower. From the photos, the unit looked to be in decent shape.

When our tech arrived he found about four inches of sediment and a dip tube that had broken off near the top. He flushed the tank, replaced the dip tube, and checked the anode rod while he was there. The family got their hot water back for the price of a repair with our one-year parts and labor warranty. We told them honestly that at eight years old with our water, they should plan for water heater installation in the next few years, and we would rather they do that on their schedule than on a Sunday morning.

When It Really Is Time to Replace

Not every one of these is a quick fix. If the tank is leaking from the body, that is a replacement, because there is no repair for a rusted-through tank. If the heater is past eight to ten years and this is its second problem in a year, putting more money into it is usually not the right call, and I will say so. And if the sediment has hardened into a solid layer, flushing will not get it out. We explained how age plays into that decision in how long water heaters last in Arizona.

Call Do It Right Plumbing If Your Hot Water Runs Out So Fast

If your hot water runs out so fast that mornings have become a race, the fix is usually simpler than a new heater. Do It Right Plumbing has been family owned in Phoenix since 2006, ROC #219450, and I have been working on water heaters for more than 35 years. Text a couple of photos of your heater to 602-596-3013 for a free rough estimate, or call 602-428-2585. Every repair comes with our one-year parts and labor warranty.