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—Pumps, filtration and plant

Upgrading to a variable-speed pump

A variable-speed pump can run slowly for most of the day and faster when needed. For many pools that means lower energy use and less noise.

Single-speed pumps run at full speed whenever they are on. Variable-speed pumps let the speed be set for different tasks: low for routine filtration, higher for backwashing, heating or features. Because energy use rises steeply with speed, running slower for longer often uses considerably less energy while still turning the water over.

Equipment guides are about choosing, sizing and installing plant, not about day-to-day pool care.

An upgrade involves checking that the new pump suits the pipework, filter and other equipment, and that the electrical supply and controls are compatible. Some heaters and chlorinators need a minimum flow, which is set in the pump’s programme. Installation includes programming schedules appropriate to the pool.

01Summary

What matters most here

  • Lower energy use

    Slower running uses less power.

  • Quieter

    Low speeds are much less noisy.

  • Programmable

    Different speeds for different tasks.

02Detail

What to check

  • Compatibility

    With filter, heater and chlorinator flow needs.

  • Pipework

    Connections and sizes.

  • Electrical supply

    Suitable for the new pump.

  • Controls

    Built-in timer or external automation.

  • Programming

    Schedules set for the pool.

03Before you start

Before upgrading

  • Note current pump details

    Model and rating.

  • List connected equipment

    Heater, chlorinator, features.

  • Ask about programming

    Who will set schedules.

—In practice

How to use this

Check whether the existing pipework, filter and controls suit a variable-speed pump, and decide how speeds will be programmed for filtration, cleaning and any features. After installation, set the schedules deliberately and review them after a few weeks, balancing water quality against energy use and noise.

Mistakes worth avoiding

Running it at full speed
A variable-speed pump left on its highest setting all day gives none of the energy or noise benefit it was bought for.
Ignoring minimum flows
Heaters and chlorinators need a minimum flow to work safely. Programme the speeds so those minimums are always met.

04FAQ

Common questions about this

Will a variable-speed pump save money?
It often reduces energy use; savings depend on how it is programmed and used.
Is it quieter?
At low speeds, typically much quieter.
Does it work with my heat pump?
Usually, with speed set to meet the heat pump’s minimum flow.
Can it replace a single-speed pump directly?
Often, with checks on plumbing and electrics.

05Read next

More pool guides on this

Filed under pump & filtration systems. Every pool guide is listed on the pool guides page.

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Considering an upgrade?

Send your current pump details. We will tell you what the upgrade would involve.

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