Cord Zero vs CTEK Chargestorm Connected 3: £531 apart, different planets

£531 and a phase apart

The Cord Zero costs £555. The CTEK Chargestorm Connected 3 costs £1,086. That is a £531 gap — enough to buy an Easee One outright — and it only makes sense if you understand what the CTEK is built for and whether your house can use it.

• Cord Zero — a single-phase smart charger with dual Wi-Fi + 4G, built-in safety hardware, and direct EV tariff integration. £555 for the 5m tethered version.
• CTEK Chargestorm Connected 3 — a three-phase-native, untethered unit with commercial-grade metering and OCPP 2.0.1 support. £1,086, and it expects an installer bill to match.

The single-phase question the CTEK can't dodge

On a standard UK single-phase supply, both chargers deliver roughly 7.4kW. The CTEK's headline — 22kW on three-phase at 32A — is irrelevant if your home doesn't have three phases, and fewer than 5% do. You'd be paying £1,086 for hardware capped at the same speed as a charger costing £555, plus install costs of £900–£1,300 versus the Cord Zero's £400–£500.

The Cord Zero's built-in RCD, PEN fault detection, and surge protection typically shave £150–£250 off the electrician's bill. The CTEK includes its own MRCD Type B — a good inclusion — but the rest of the install is heavier: the unit weighs up to 24 kg (the Cord Zero is around 5 kg), and the wiring expectations are more demanding. Total installed cost on single-phase: roughly £955–£1,055 for the Cord Zero, roughly £1,986–£2,386 for the CTEK. Both are OZEV-approved, so eligible renters and flat owners can take £500 off either figure.

If you're on single-phase, this comparison is already over.

Smart tariffs: one charger talks to your supplier, the other doesn't

The Cord Zero integrates directly with Octopus Intelligent Go, Octopus Go, OVO Charge Anytime, British Gas Electric Drivers, and EDF GoElectric through its own app. Set a target charge level, and the charger handles the scheduling around off-peak windows — 7p/kWh on Intelligent Go, 8.5p/kWh on Go.

The CTEK has no first-party tariff integration at all. Scheduling requires an OCPP-compatible third-party platform like Monta. That works, but it's a layer of friction the Cord Zero simply doesn't have. For a household wanting to plug in, set a departure time, and let the charger chase cheap rates, the Cord Zero is the more capable product — at less than half the price.

The CTEK's OCPP 2.0.1 and ISO 15118 support are forward-looking credentials, and they matter if you're building a small fleet or want plug-and-charge authentication. For a single domestic car, they're theoretical advantages today.

When the CTEK earns its price

Three-phase supply. That's the case, and it's a narrow one for residential buyers. If you've had three phases installed — or you're in a rural property that already has them — the CTEK delivers 22kW, roughly three times faster than any single-phase charger. A 60 kWh battery goes from 20% to 80% in under two hours rather than five-plus.

The MID-approved, Eichrecht-compliant energy meter is a genuine differentiator for anyone who needs auditable billing — a landlord charging tenants, a business reclaiming mileage, or a shared-access installation. The Cord Zero has energy monitoring, but not to a certified, legally meterable standard.

The five-year warranty is standard on the CTEK; the Cord Zero's is three years, though a promotional extension to five years is currently running. If that promotion ends, the warranty gap is real.

For three-phase buyers who want an alternative at a lower price, the Zaptec Go 2 at £500 is worth a look — it also supports three-phase and OCPP 2.0.1, though without the CTEK's built-in MID meter.

Which to buy

Buy the Cord Zero if:

• Your home has single-phase supply — which is almost certainly the case
• You want direct smart-tariff integration without third-party apps
• You value low total installed cost (unit + install typically under £1,100)

Buy the CTEK Chargestorm Connected 3 if:

• You have three-phase supply and want 22kW home charging
• You need MID-certified metering for billing or expense claims
• You're building an OCPP-managed setup and don't mind third-party scheduling

For the reader on a standard UK supply who wants a charger that connects reliably, talks to their tariff, and doesn't punish the install budget — the Cord Zero is the straightforward choice. The CTEK is a serious piece of hardware solving a problem most homes don't have. At £531 more before you even call an electrician, it needs three-phase power to justify itself. Without it, you're paying twice for the same 7.4kW.