Single Speed vs Variable Speed Pump for Suction Cleaners

Suction cleaners and the pool pump

A suction-side pool cleaner has no motor of its own. It moves because water from the pool pump flows through the cleaner's hose, past its drive mechanism, and back to the pool. That makes the pool pump part of the suction cleaner's shopping context. The cleaner's listing usually names the pump requirement with words such as 'flow rate' or 'pump horsepower'.

The pool pump is separate equipment. It recirculates water through the filter and around the pool. The pump's speed determines how much water it moves, and pool pumps run at different speeds depending on what the pool is doing. The ENERGY STAR pool pumps page explains that filtration needs a lower flow than running a pool cleaner.

This article explains the pump words you will see on pump listings and pool cleaner listings, so you can compare them as buying terms. The pump maker's manual and a pool professional cover installation and setup; this article covers only the words on the page.

Reading a single-speed pump listing

A single-speed pump is a pump with one speed. On a pump listing, look for the words 'single speed' in the title or in the bullets. Some listings do not say 'single speed' at all; they list only a horsepower figure. In that case the pump is likely a conventional pump that runs at one speed.

The ENERGY STAR page describes conventional single-speed pumps as set to run at the higher speeds required of a pool cleaner, which wastes energy during filtration because the pump runs faster than necessary. That page also states that filtration requires only about half the flow rate of running a pool cleaner.

For a suction cleaner, a single-speed pump delivers one flow. Whether that flow suits the cleaner is a question to read on the cleaner's listing and the pump maker's page, not on this site.

Words to expect on a single-speed pump listing:

• Horsepower on a pump listing is the seller's figure; the maker's page for that pump model gives the details.
• A single-speed pump listing rarely states a flow rate in the title; read the pump maker's page for the model.

Reading a variable-speed pump listing

A variable-speed pump can run at different speeds and be programmed to match the pool operation with its appropriate speed. On a listing, the words 'variable speed' or 'multi-speed' may appear, sometimes with a number of speeds. The ENERGY STAR page states that reducing pump speed by one-half allows the pump to use just one-eighth as much energy.

The ENERGY STAR page also explains that certified pool pumps are independently certified to meet energy criteria, and that certified pumps are available for in-ground pools, above-ground pools, and pressure cleaner booster pumps. The page gives the energy figures; a pump listing gives the model's speed range.

For a suction cleaner, a variable-speed pump can be set to a flow that matches the cleaner's listed requirement. Read the pump's speed range on the pump listing and the cleaner's required flow on the cleaner listing, then compare them on paper.

Pump makers such as Pentair publish product pages for their pump models; those pages carry the speed terms you compare against a cleaner's requirement.

Flow rate and suction cleaner operation

Flow rate is the amount of water a pump moves in a given time. On a suction cleaner listing, you may see a required flow rate per minute or per hour, or a pump horsepower range. These are the seller's stated figures; they tell you what the cleaner needs, not what any pump will deliver.

A suction cleaner's drive mechanism is powered by that flow, so a steady flow matters for how the cleaner operates. A single-speed pump delivers one flow; a variable-speed pump delivers the flow you set. The cleaner's listing and the pump's manual together describe the flow to use.

This site cannot tell you which flow a cleaner needs. That figure belongs to the maker. Read it on the cleaner's listing or the maker's page. The related article on required flow rate for suction cleaners explains the term in more depth.

Pump words on pool cleaner listings

Pool cleaner listings often carry pump-related words: 'flow rate', 'pump horsepower', 'works with your pool pump', 'requires a dedicated suction line'. Each is a listing term, not a promise about cleaning results.

A listing that says 'works with your pool pump' usually identifies a suction-side cleaner. A listing that names a booster pump usually belongs to a pressure-side cleaner. The suction-side versus pressure-side article explains the difference, and the pump requirements article covers horsepower words.

Words to interpret on a pool cleaner listing:

• 'Flow rate' on a cleaner listing is the maker's requirement; read it on the maker's page.
• 'Variable speed' on a pump listing is a pump feature, not a cleaner feature.
• A listing that names no pump term may still be suction-side; the article on pool cleaner water demand and pump flow covers that case.

Where to read pump and cleaner details

A pump listing and a cleaner listing are two documents. The pump maker's page states the pump's speeds and its energy characteristics; the cleaner maker's page states the flow the cleaner needs. Read them beside each other before you buy.

The Pool and Hot Tub Alliance publishes consensus standards for residential pools, including an energy efficiency standard for residential swimming pool and spa equipment. That standard is the context for the efficiency language you see on pump listings.

Installation of a pump, a suction line, or a skimmer connection belongs to the pump maker's manual and to a pool professional. The pool cleaner pump requirements article keeps to the buying terms.

Your shopping situation

Whether the pump's speed matters to your cleaner choice depends on what you already own. A first-time buyer with no pump yet reads both the pump and the cleaner listings. A pool owner with an existing pump reads the cleaner's required flow against the flow the pump can deliver.

The site's buying guides compare cleaners by their stated details. Use the guide that matches your pool type and the cleaner type you want: suction pool cleaners, suction cleaners for inground pools, or the main pool cleaner guide.

If you want a cleaner that runs on its own low-voltage power instead of the pool pump, the article on suction versus robotic energy use compares how the two types get their power.

What to pick for your situation

Questions

Does a suction cleaner need a single-speed or a variable-speed pump?

A suction cleaner needs the flow the maker states. That flow can come from a single-speed pump or from a variable-speed pump set to the right speed. Read the cleaner's listing and the pump maker's page for the figure the cleaner asks for.

What does flow rate mean on a suction cleaner listing?

Flow rate is the amount of water the pump moves in a time period. On a suction cleaner listing it appears as the cleaner's requirement, in words such as 'flow rate' or 'pump horsepower'. The listing states what the cleaner needs; the maker's page gives the exact figure.

Will a variable-speed pump change how your suction cleaner works?

A variable-speed pump can be set to different speeds, so you can set the flow to what the cleaner's listing asks for. The ENERGY STAR page describes how pump speed changes energy use. The cleaner maker's manual describes the flow you should use for that model.

Is the pool pump part of the cleaner's price tier on this site?

No. The site's guides compare cleaners by their stated details. The pool pump is separate equipment you shop for alongside. Compare the cleaner first, then read the pump listing against the cleaner's requirement.

Where do you find the flow figure for your suction cleaner?

The cleaner's listing may state it in the title or in the bullets. If the listing does not state it, read the maker's page for that model. The pump maker's page states the pump's speeds and flow range.