Cord Zero vs CTEK Chargestorm Connected 3

£613 and a phase apart

These two chargers have almost nothing in common besides a Type 2 plug and OZEV approval. The Cord Zero costs £473, weighs about 5 kg, and is designed to sit on a typical UK house wall, talk to your energy tariff, and get out of the way. The CTEK Chargestorm Connected 3 costs £1,086, weighs up to 24 kg, and is engineered more like a car-park unit that happens to be sold to homeowners. The £613 gap between them is not a premium for polish — it buys three-phase hardware, a MID-approved meter, and OCPP 2.0.1 compliance. Whether any of that matters to you depends on a single question: how many phases come into your house.

• Cord Zero — £473. Smart tariff scheduling, 4G failover, built-in safety suite. The pragmatic single-phase choice.
• CTEK Chargestorm Connected 3 — £1,086. Native 22kW three-phase, commercial-grade metering, no first-party tariff app. For a specific kind of install.

Why the Cord Zero is the default for most buyers

Around 97% of UK homes run on a single-phase supply. On single-phase, the CTEK delivers the same ~7.4kW as the Cord Zero — you are paying £613 extra for three-phase circuitry that sits idle. The Cord Zero, meanwhile, earns its keep in ways that matter daily. Its Cord AI app integrates directly with Octopus Intelligent Go, Octopus Go, OVO Charge Anytime, British Gas EV Power, and EDF GoElectric. Set your tariff, set your departure time, and the charger handles the rest.

The CTEK has no first-party tariff integration at all. Scheduling requires a third-party OCPP back-end — Monta is the usual suggestion — and none of those platforms currently replicate the direct API link that Intelligent Go uses to shuffle your charging into the cheapest half-hour slots. If cheap overnight electricity is the reason you are buying a smart charger, the Cord Zero does more for £613 less.

Connectivity reinforces the point. The Cord Zero ships with Wi-Fi and a built-in multi-network 4G SIM that fails over automatically. Garages with patchy broadband — a common enough situation — stay connected. The CTEK offers Wi-Fi and dual Ethernet as standard, but its 4G modem is an optional add-on, which means more cost on an already expensive unit.

When the CTEK earns its price

The Chargestorm Connected 3 exists for a narrower audience, and for that audience it is hard to argue with. If your property has — or is getting — a three-phase supply, the CTEK delivers 22kW at 32A natively. That roughly triples charging speed: a 60kWh battery from 20% to 80% in under two and a half hours rather than six-plus. For high-mileage drivers on three-phase, the time saving is real.

The built-in MRCD Type B protection (30mA AC / 30mA DC) removes the need for a separate Type B RCD in the consumer unit — a component that typically adds £200–£300 to other installs. The MID-approved, Eichrecht-compliant energy meter is relevant if you need auditable billing — a landlord recouping electricity from a tenant, say, or a small business claiming mileage. These are features designed for accountability, not convenience.

Its OCPP 2.0.1 and ISO 15118 support also future-proof the unit for plug-and-charge authentication and evolving back-end platforms. If you are the sort of buyer who plans an install for the next decade, the protocol stack matters. If you just want your Tesla charged by morning, it does not.

The natural comparison for three-phase buyers is the Zaptec Go 2 at £638 — also three-phase capable, lighter, and cheaper, though without the MID meter or Type B RCD built in. That pairing is covered in the Zaptec Go 2 vs CTEK comparison.

Installation cost widens the gap further

The Cord Zero's built-in RCD, PEN fault detection, SPD, and overvoltage protection typically save £150–£250 on install labour. Cord quotes £400–£500 for a standard fit. The CTEK's install runs £900–£1,300 — partly because three-phase wiring is more involved, partly because the unit weighs up to 24 kg and needs robust mounting. Total outlay for the Cord Zero: roughly £873–£973. Total for the CTEK: roughly £1,986–£2,386. The gap in practice is closer to £1,100–£1,400 once installation is included.

Both chargers are OZEV-approved, so grant-eligible renters and flat owners can claim the £500 grant. That covers the Cord Zero's £473 unit price outright and chips into the install. For the CTEK, it takes £500 off £1,086, leaving £586 before installation.

The verdict

Buy the Cord Zero if:

• You have single-phase power — which is almost certainly the case
• You want direct tariff integration with Octopus, OVO, British Gas, or EDF
• You want the lowest total cost for a reliably connected smart charger

Buy the CTEK Chargestorm Connected 3 if:

• You have or are installing a three-phase supply and want 22kW charging
• You need MID-approved metering for billing or business use
• You are comfortable using Monta or another OCPP platform instead of a first-party app

For the typical UK home, the Cord Zero is the charger to fit. It costs less than half the CTEK, installs for less, talks to your tariff natively, and delivers the same 7.4kW on single-phase. The CTEK is a fine piece of hardware — overbuilt, if anything — but it is solving a problem most domestic buyers do not have.