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Best UPS units with pure sine wave output (2026)

Pure sine wave output suits modern power supplies with active PFC, which can misbehave on a stepped wave. Best first, by our score. Running costs assume 24/7 at idle, at 26.32p/kWh. Where we don't have today's price, we use the typical UK price we found when researching it.

Researched, not hands-on tested.How we review ›

  1. #1

    Eaton 5S 1000i

    7.0/10verdict: buy

    The Eaton 5S 1000i is a line-interactive UPS with four battery-backed outlets and four surge-only outlets. It suits buyers who want automatic shutdown over USB and batteries they can replace themselves. It doesn't suit anyone who needs network management cards or SNMP.

    1000 VA / 600 WLine-interactive8 IEC C13 outlets: 4 battery-backed with…Pure sine wave
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    £309typical UK price when researchedSearch Amazon UK (opens in a new tab, affiliate link)

    Affiliate link. As an Amazon Associate I earn from qualifying purchases. Details

  2. #2

    APC Smart-UPS C SMC1000IC

    6.5/10verdict: buy

    The APC Smart-UPS C SMC1000IC is for people protecting a NAS, router, switch and a few other devices with a 600 W line-interactive UPS. It suits those who want pure sine output and eight IEC outlets for a small rack or desk setup. It is a better fit for clean shutdown than long ride-through, and NAS owners should check software compatibility first.

    1000 VA / 600 WLine interactivePure sine wave on battery8x IEC 320 C13Pure sine wave
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    APC Smart-UPS C SMC1000IC
    £502.58typical UK price when researchedSearch Amazon UK (opens in a new tab, affiliate link)

    Affiliate link. As an Amazon Associate I earn from qualifying purchases. Details

  3. #3

    CyberPower CP1500EPFCLCD

    6.2/10verdict: good, not the best

    The CyberPower CP1500EPFCLCD suits people protecting a desktop PC or a small NAS, router and switch stack from short mains outages. Its headline specs are a 900W rating and pure sine wave output on battery. It is a weaker fit for anyone who needs confirmed automatic NAS shutdown or long runtime at heavy load.

    1500 VA / 900 WLine-interactivePure sine wave on batterySchuko x 6Pure sine wave
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    £390typical UK price when researchedSearch Amazon UK (opens in a new tab, affiliate link)

    Affiliate link. As an Amazon Associate I earn from qualifying purchases. Details

  4. #4

    CyberPower Value Pro VP1000ELCD

    5.4/10verdict: good, not the best

    The CyberPower Value Pro VP1000ELCD is a 1000VA line-interactive UPS for a small NAS, router and switch setup. It suits buyers who want USB-based automatic shutdown and mains regulation at a modest capacity. It is a weaker fit for anyone who needs confirmed UK sockets or a pure sine wave output.

    1000 VA / 550 WLine-interactiveSimulated sine wavePure sine wave
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    £176.07typical UK price when researchedSearch Amazon UK (opens in a new tab, affiliate link)

    Affiliate link. As an Amazon Associate I earn from qualifying purchases. Details