Why Does It Take So Long to Get Hot Water?
Short answer: it takes so long to get hot water because the water already sitting in your pipes has cooled off, and it has to be pushed out of the faucet before hot water from the heater can arrive. The farther the faucet is from the water heater, the longer you wait. In most Scottsdale homes the best fix is a hot water recirculation pump, which keeps hot water close to your fixtures so it shows up in a few seconds instead of a minute or more.
Written by Casey Dominick, licensed Arizona plumber (ROC #350819). We fix slow hot water across Scottsdale, Phoenix, Paradise Valley and Fountain Hills. Want a flat-rate quote on a recirculation pump? Call (623) 323-4538.
Key takeaways
- Distance is the main cause. Every foot of pipe between the heater and the faucet holds water that has gone cold and must drain first.
- Normal wait: about 5–15 seconds. Too long: 30 seconds or more, especially at a far bathroom.
- Low flow fixtures make it slower. A 1.5 GPM faucet takes longer to clear the same pipe than a 2.5 GPM shower.
- A recirculation pump is the most effective fix for a far-away bathroom or kitchen. Typical 2026 installed cost: $550–$1,400 for a retrofit pump.
- Sudden changes are different. If hot water used to come fast and now doesn't, look at the water heater, a mixing valve or a failing thermostat.
Why it takes so long to get hot water: the 6 real causes
1. The faucet is far from the water heater
This is the cause in most homes. Many Scottsdale houses are single-story and spread out, with the water heater in the garage at one end and the main bathroom at the other. That can mean 60–100 feet of pipe. When you open the tap, all the water in that pipe has cooled to room temperature, and you have to run it out before the hot water arrives.
2. Pipe size holds more water than you think
Wider pipe holds more water. A ¾-inch line holds almost twice as much water per foot as a ½-inch line, so it takes longer to clear.
| Pipe size (copper or PEX) | Water per 10 feet | Wait at 1.5 GPM for 60 feet |
|---|---|---|
| ½ inch | about 0.10 gallon | about 25 seconds |
| ¾ inch | about 0.25 gallon | about 60 seconds |
These are rough numbers. Real waits run a little longer because the pipe itself must warm up too.
3. Low flow faucets and shower heads
Water-saving fixtures are good for your bill, but they move less water each second. That means the cold water in the pipe drains more slowly. Switching from an old 2.5 GPM shower head to a 1.8 GPM one can add 10–20 seconds to your wait at a far bathroom.
4. Pipes that lose heat
Pipes running through a slab, an exterior wall or an attic lose heat fast between uses. In winter, the cold pipe also pulls heat out of the first hot water that reaches it. Insulating exposed hot lines helps a little, but it won't fix a long run on its own.
5. A tankless water heater's start-up delay
A tankless unit needs a few seconds to sense flow and fire up. That adds to the time it takes water to travel the pipe. Many tankless owners notice a longer wait than they had with a tank, and a "cold water sandwich" when the tap is turned off and back on. Many tankless models can work with a recirculation pump, and some have one built in. If you're deciding between the two types, see our tankless vs tank cost breakdown.
6. A problem with the water heater or a valve
If hot water used to arrive quickly and now it doesn't, or it never gets fully hot, the delay isn't about distance. Common causes:
- Sediment or scale in the tank. Valley water is hard, and scale cuts how much hot water the heater can deliver. See is water heater flushing necessary?.
- A failing thermostat or heating element on an electric heater.
- A worn shower mixing valve that blends in too much cold water. See our shower valve replacement guide.
- A heater that's too small for how your family uses water. See what size water heater do I need?.
How long should it take to get hot water?
| Wait time | What it usually means |
|---|---|
| Under 15 seconds | Normal for most fixtures |
| 15–30 seconds | Long pipe run or low flow fixture; annoying but normal |
| 30–60 seconds | Far bathroom; good candidate for a recirculation pump |
| Over 60 seconds | Very long run, large pipe, or a heater or valve problem |
| Never fully hot | Heater, thermostat or mixing valve problem; call a plumber |
A quick test: run the far faucet and time how long until it feels hot. Then run the faucet closest to the heater. If the near one is fast and the far one is slow, distance is the cause. If both are slow or neither gets fully hot, look at the water heater.
The fix: install a hot water recirculation pump
A recirculation pump moves the cooled water in your hot line back to the water heater instead of down your drain. That keeps hot water waiting near your faucets, so it arrives in a few seconds. It also saves water. A household waiting 45 seconds a few times a day can run thousands of gallons down the drain each year.
Option 1: Retrofit pump with a crossover valve (most common)
The pump mounts at the water heater. A small valve goes under the sink farthest from the heater. That valve sends cooled water from the hot line back through the cold line to the heater. No new pipe is needed, which makes this the best fit for most existing Scottsdale homes. One trade-off: the cold tap at that sink can run lukewarm for a few seconds.
Option 2: Pump on a dedicated return line
If your home was built with a return line, or the walls are open for a remodel, the pump can push water around a true loop. This gives the fastest hot water at every fixture and keeps your cold water fully cold. It costs more because of the extra pipe.
Option 3: On-demand pump (button or motion sensor)
Instead of running on a timer, the pump runs only when you push a button or walk into the bathroom. You wait about 20–30 seconds for the pump, then get hot water right away. This uses the least energy and is the best match for tankless water heaters.
Timer, sensor or always-on?
Avoid running a pump 24 hours a day. It wastes energy and keeps your heater firing all night. A timer set for morning and evening, a temperature sensor, or an on-demand button gives you most of the benefit for a fraction of the running cost.
2026 recirculation pump cost in Scottsdale
| Option | Typical installed cost |
|---|---|
| Retrofit pump with under-sink crossover valve | $550 – $1,400 |
| On-demand button or motion-sensor pump | $700 – $1,600 |
| Pump on an existing dedicated return line | $600 – $1,300 |
| New dedicated return line plus pump | $1,800 – $4,500+ |
| Tankless unit with built-in recirculation | priced with the heater |
Price depends on the pump brand, whether there's an outlet near the water heater, how easy the far sink is to reach and whether the line needs a check valve or expansion tank. You'll get a flat written quote before we start. Running cost for a timer or on-demand pump is usually a few dollars a month in electricity.
Other ways to get hot water faster
- Point-of-use water heater. A small tank or electric tankless unit under one far sink. Good for a single fixture, but it doesn't help the rest of the house.
- Insulate exposed hot pipes. Cheap and helps a bit, especially in the garage and attic.
- Move or add a water heater. Sometimes worth it during a remodel for a far wing of the house.
- Fix a heater or valve problem first. If hot water never gets fully hot, a pump won't solve that. Start with water heater repair.
When to call a plumber
Call us if your wait is over 30 seconds at a bathroom you use every day, if hot water suddenly started taking longer, or if it never gets fully hot. We'll time the fixtures, check the water heater and recommend the simplest fix. That's often a recirculation pump, and sometimes a repair that costs less.
Ready to stop waiting? Call (623) 323-4538 or learn more about our water heater services.
Frequently asked questions
Why does it take so long to get hot water in my house? The water sitting in your hot water pipe has cooled off, and it must flow out of the faucet before hot water from the heater arrives. The longer and wider the pipe, and the lower the faucet's flow, the longer the wait.
How long should it take for hot water to reach a faucet? Usually 5–15 seconds. Waits of 30 seconds or more at a far bathroom are common in spread-out single-story homes and are a good sign a recirculation pump would help.
Does a hot water recirculation pump really work? Yes. A recirculation pump keeps hot water near your fixtures, so it arrives in a few seconds instead of a minute. It also saves the water you would otherwise run down the drain while waiting.
How much does a hot water recirculation pump cost to install in Scottsdale? Most retrofit recirculation pumps cost $550–$1,400 installed in 2026. Adding a new dedicated return line can bring the total to $1,800–$4,500 or more.
Does a recirculation pump work with a tankless water heater? Often, yes. Many tankless models have a built-in pump or work with an on-demand pump. Check your model first, because some tankless units need a specific pump or setting.
Why does my hot water take longer than it used to? If nothing changed in your plumbing, the cause is often scale in the water heater, a failing thermostat or element, or a worn shower mixing valve. Have the water heater checked before adding a pump.
Will a recirculation pump raise my electric bill? Only slightly when it runs on a timer, sensor or button, usually a few dollars a month. A pump left running all day costs more and makes the water heater work harder, so we set them up to run only when needed.