Best Pool Timers
For most in-ground pools the best pool timer is still the Intermatic T104, the plain mechanical time switch pool pros have wired to 240 volt pumps for decades, and for a plug-in above-ground pump it is the Intermatic P1131. But the brand is not the first decision. What actually sets your choice is how your pump gets power and how much control you want: a 240 volt hardwired pump needs a hardwired switch (the T104, or the 120 volt T101), a 120 volt plug-in pump wants a plug-in timer you never have to wire, and if you want to run the pump from your phone on different schedules through the week, a WiFi timer like the DEWENWILS does that. One more thing before you buy anything: if you run a variable-speed pump, it almost certainly has a scheduler built in, so you may not need a separate timer at all. Here are the picks by situation, and what actually matters when you choose.
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Intermatic T104 Mechanical Time Switch
Who it is for: In-ground owners whose pump is hardwired at 240 volts and who want the simplest timer that just runs for years.
- +The T104 is the industry-standard 24-hour mechanical time switch for a 240 volt pump (40 amp, double-pole): you set on and off by clipping trip pins onto a motor-driven dial, and there is almost nothing to break.
- +For a 120 volt hardwired pump the same timer is the T101 (single-pole); both are the T100 series that pool pros install by default.
- +Buy the bare mechanism to mount in an existing subpanel, or the T104R / T101R, which is the same works inside a weatherproof steel outdoor enclosure you can hang at the equipment pad.
Watch out: A mechanical dial repeats the same on/off cycle every day and cannot run different times on different days. It also loses its schedule in a power outage, because the dial stops turning and the clock drifts, so reset the time after any blip. Wiring a 240 volt timer is line-voltage work: kill the breaker first, and if you are not comfortable inside a live panel, hire an electrician. It must be GFCI-protected and bonded to code.
Intermatic P1131 Outdoor Plug-In Timer
Who it is for: Above-ground and Intex-style owners whose pump plugs into a 120 volt outlet and who do not want to wire anything.
- +A heavy-duty plug-in timer in its own weatherproof enclosure: your pump cord plugs into it, it plugs into a grounded outlet, and you set the on and off pins on a 24-hour dial. No hardwiring at all.
- +It is rated for the load an above-ground pump motor pulls, unlike a light-duty lamp or appliance timer that can overheat and fail on a motor.
- +The grounded, gasketed housing is built to sit outdoors at the pad in the weather, which a plain indoor plug-in timer is not.
Watch out: This is a 120 volt plug-in unit only; it will not run a 240 volt hardwired pump (that is the T104's job). Like any mechanical timer it repeats one daily cycle and drifts after an outage. Keep the cover latched and plug it into a GFCI-protected outlet.
DEWENWILS Outdoor WiFi Pool Pump Timer
Who it is for: Owners who want to set schedules and flip the pump from their phone, and who want more than one on/off cycle a day.
- +App control over WiFi with 7-day programmable schedules, so you can run different times on different days and split the run into several blocks through the day, which a mechanical dial cannot do.
- +It comes in a hardwired 40 amp, 120 to 277 volt model that drops in where a T104 would go (so it handles a 240 volt pump), and a plug-in version for a 120 volt above-ground pump.
- +Being electronic, it keeps its schedule through a power outage instead of drifting like a wind-up dial, and it typically works with Alexa and Google Assistant for voice and remote control.
Watch out: It needs a solid 2.4 GHz WiFi signal at the equipment pad, which is often the far corner of the yard, so check coverage before you depend on it. More electronics means more that can fail than a bare mechanical switch, and the hardwired model is still 240 volt line-voltage work for an electrician.
Your Pump's Built-In Scheduler (Pentair, Hayward, Jandy)
Who it is for: Anyone running a modern variable-speed pump, or shopping for a new pump, who is about to buy a timer they may not need.
- +Most variable-speed pumps (Pentair IntelliFlo and SuperFlo VS, Hayward TriStar and MaxFlo VS, Jandy VS-FloPro) have a digital scheduler built into the pump, so a separate external timer is usually redundant.
- +The built-in schedule can run the pump at different speeds at different times (low and quiet for most of the day, high for cleaning or the cleaner cycle), which an external on/off timer cannot do at all.
- +See variable-speed vs single-speed pumps and the best pool pumps for why the pump itself is where the schedule should live.
Watch out: Cutting power to a variable-speed pump with an outside timer can interrupt its program and, on some models, throw a fault on restart. If you add an external timer anyway (say, to kill standby draw), set it to keep power on across the pump's whole run window and let the pump control the speed. Check the pump manual, since a few installs are wired to expect a timed feed.
What actually matters when buying
Which pool timer should you buy. Start with how your pump is powered, not the brand. A 240 volt hardwired pump (most in-ground pools) needs a hardwired switch: the Intermatic T104 mechanical, or a DEWENWILS 40 amp WiFi model if you want phone control. A 120 volt plug-in pump (most above-ground pools) wants a plug-in timer you never wire, like the Intermatic P1131 or a plug-in WiFi unit. Then decide between mechanical and smart: a mechanical dial is the cheapest and most reliable if one repeating daily cycle is all you need, while a WiFi timer earns its price if you want multiple cycles, different schedules on different days, or control from your phone. And if you already run a variable-speed pump, the answer is usually no separate timer at all, because the schedule belongs inside the pump.
Are digital or mechanical pool timers better. Neither is simply better; they trade reliability for flexibility. A mechanical timer (the trip-pin dial) is dead simple, cheap, and hard to kill, but it runs only one on and off cycle per day, repeats it every day, and loses its schedule in a power outage because the dial stops turning. A digital or WiFi timer holds its schedule through an outage, runs several cycles a day, lets you set different times on different days, and adds phone or voice control, at the cost of more electronics that can fail and, for WiFi, a dependence on signal at the pad. For a single fixed run each day, a mechanical T104 is all most pools need. If you want to shift run time by season, split it into blocks, or control it remotely, go digital.
What are the best timer settings for a pool pump. Set the timer to turn the water over about once a day. The run time you want is roughly one full turnover of the pool's volume, which for many pools lands near 8 hours a day in summer, less in the off-season. Do not guess: size it from your real gallons and pump flow with the pool volume calculator, and see how long to run a pool pump for the full method. Two practical rules on top of the turnover number: run the pump during off-peak or overnight hours if your utility charges by time of use, since the pump is one of the biggest electrical loads at the house, and run more in a heat wave or during an algae fight, when the water needs more filtering and circulation. Splitting the run into two blocks (a digital timer's advantage) keeps the water moving across the day.
Do you need a pool timer if you have a variable-speed pump. Usually not. A variable-speed pump has a programmable scheduler built into its own control panel, so it starts, stops, and changes speed on its own without any external timer. That built-in schedule is actually better than a plain timer, because it can run the pump slow and quiet for most of the day and ramp to high speed only for cleaning, which is where a variable-speed pump saves most of its energy. Wiring an external on/off timer in front of one can interrupt the pump's program and, on some models, cause a fault when power returns. If you are still running an old single-speed pump, a timer is the right tool. If you are buying a new pump, let the pump's own scheduler do the job and skip the separate timer.
What is the best pool control system. A timer only turns the pump on and off; a pool control system (automation) manages the whole pad. Systems like the Pentair EasyTouch and IntelliCenter or the Hayward OmniLogic control pump speed, the heater, lights, valves, and a salt cell together from one app. They are the right call for a complex pool with a heater, spa, water features, and automated valves, or for anyone who wants one screen for everything. For a basic pool that just needs the pump on a schedule, automation is far more than you need and far more expensive: a mechanical timer or a variable-speed pump's built-in scheduler does the one job for a small fraction of the cost. Buy the automation panel when you actually have several things to automate, not just a pump to switch.
How we picked
This is a research-based guide. We compared pool timers on how the pump is powered (240 volt hardwired versus 120 volt plug-in), mechanical versus digital and WiFi control, load rating for a pump motor, weatherproofing for outdoor mounting at the pad, scheduling flexibility, and price, across the main brands (Intermatic and DEWENWILS) plus a broad set of owner reviews, and against what a variable-speed pump's built-in scheduler already does. We do not bench-test products, and we take no payment for placement. One safety note outranks any pick: a pool timer switches electricity next to water. Setting a plug-in timer is a DIY job, but wiring a 240 volt hardwired timer means working in a live panel, so cut the breaker first and hand the job to a licensed electrician if you are unsure. Every pool pump circuit must be GFCI-protected and bonded to code (NEC 680).
Keep your water right, too
Gear handles the cleaning; chemistry is the other half. Useful next: how long to run a pool pump, variable-speed vs single-speed pump, best pool pumps, pool volume calculator, all calculators.
Frequently asked questions
Which pool timers are the best rated?
For a 240 volt hardwired pump, the Intermatic T104 mechanical time switch (the T101 for 120 volt) is the long-standing standard that pool pros install by default, and it is about as reliable as a timer gets. For a plug-in above-ground pump, the Intermatic P1131 is a heavy-duty outdoor plug-in timer in a weatherproof enclosure. If you want phone control and schedules that change through the week, a DEWENWILS outdoor WiFi timer comes in both a hardwired 40 amp model and a plug-in version. And if you run a variable-speed pump, the best-rated timer is the one already built into the pump.
Are digital or mechanical pool timers better?
Neither is simply better. A mechanical timer (a trip-pin dial) is cheap, simple, and very reliable, but it runs only one on and off cycle a day, repeats it every day, and loses its schedule after a power outage because the dial stops turning. A digital or WiFi timer holds its schedule through an outage, runs multiple cycles a day, lets you set different times on different days, and adds phone or voice control, but it has more electronics to fail and, for WiFi, needs a signal at the pad. For one fixed daily run, mechanical is fine; for flexibility or remote control, go digital.
What are the best timer settings for a pool pump?
Set the pump to turn the water over about once a day, which for many pools is roughly 8 hours in summer and less in the off-season. Size it from your actual gallons and pump flow rather than guessing (use the pool volume calculator and the how-long-to-run-a-pool-pump guide). Run the pump during off-peak or overnight hours if your utility charges by time of use, since it is one of the largest electrical loads at the house, and run more during a heat wave or an algae fight. Splitting the run into two blocks keeps the water circulating across the day, which a digital timer makes easy.
What is the best pool control system?
A timer only switches the pump on and off. A full pool control system, or automation, such as the Pentair EasyTouch and IntelliCenter or the Hayward OmniLogic, manages the pump speed, heater, lights, valves, and salt cell together from one app. Automation is worth it for a complex pool with a heater, spa, and water features, but it is far more than a basic pool needs. If all you want is the pump on a schedule, a mechanical timer or a variable-speed pump's built-in scheduler does that job for a small fraction of the cost.
Do I need a timer if I have a variable-speed pump?
Usually not. A variable-speed pump has a scheduler built into its control panel that starts, stops, and changes the pump's speed on its own, so a separate external timer is redundant. The built-in schedule is actually better, because it can run the pump slow and quiet most of the day and ramp to high speed only when needed. Adding an external on/off timer in front of a variable-speed pump can interrupt its program and cause a fault on some models when power returns. Keep the timer for an older single-speed pump, and let a variable-speed pump run its own schedule.