Sync Energy Wall Charger 2 vs Cord Zero

The £73 question — and why install day changes the answer

The Sync Energy Wall Charger 2 costs £400. The Cord Zero costs £473. On paper, £73 separates a budget charger from a mid-price one. In practice, the gap often inverts once an electrician quotes the job.

• Sync Energy Wall Charger 2 — £400, 7.5-metre cable, built-in PEN fault protection, solar diversion via CT clamp. The lowest-cost smart tethered charger with a meaningful feature set.
• Cord Zero — £473, dual Wi-Fi + 4G connectivity, built-in RCD, PEN fault detection, SPD, and overvoltage protection. The charger that arrives with its own safety suite in the box.

Install cost is where the Cord Zero claws back its premium

Most charger installs require an earth rod (for PEN fault protection), an RCD, and sometimes a surge protection device. The Sync Energy Wall Charger 2 includes PEN fault protection — a useful saving — but the Cord Zero bundles the lot: RCD, PEN fault detection, SPD, overvoltage protection, all internal. That typically strips £150–£250 off install labour, because the electrician has less to source and wire in.

Run the arithmetic. The Sync Energy costs £400 with an install range of £300–£600. The Cord Zero costs £473 with an install range of £400–£500. On a straightforward single-phase job, the Cord Zero's all-in price can land lower than the Sync Energy's — despite the higher unit cost. Not always, but often enough that the £73 sticker gap is misleading if you stop at the charger price alone.

Both are OZEV-approved. Eligible renters and flat owners can claim the £500 grant, which covers either unit outright and chips into the install.

Connectivity: the Cord Zero's 4G removes a real risk

The Sync Energy Wall Charger 2 connects via Wi-Fi, Ethernet, or Bluetooth. That is fine if your router is close to the charger — and less fine if your consumer unit sits in a cupboard under the stairs while the charger hangs on a garage wall 15 metres away. User reviews flag mixed Wi-Fi reliability. A 4G variant exists, but it is a separate purchase decision, not the default.

The Cord Zero ships with dual Wi-Fi and 4G on a built-in multi-network SIM, with automatic failover. If the Wi-Fi drops, the 4G takes over. No thought required. For a device that needs a live connection to schedule off-peak charging — and to stay visible in your app — this is not a minor detail. A charger that loses its connection loses its smartness.

If you have strong Wi-Fi at the charger location and an Ethernet run is feasible, the Sync Energy's connectivity is adequate. If there is any doubt, the Cord Zero's approach is more robust by design.

Cable length and the Sync Energy's physical advantage

The Sync Energy Wall Charger 2's tethered variant comes with a 7.5-metre cable — longer than the Tesla Wall Connector's 7.3 metres, and longer than almost anything else on the market. The Cord Zero's standard tethered cable is 5 metres; an 8-metre version is available but costs more (£570 for the 8-metre tethered, versus £522 for the 5-metre).

If your parking spot is awkward — a long driveway, a charge port on the far side of the car — the Sync Energy's 7.5 metres included at £400 is hard to argue with. The Cord Zero can match or exceed that reach, but only at a price that widens the gap considerably.

Tariff support and app polish

Neither charger chases Octopus Agile's half-hourly prices — for that, the Ohme Home Pro remains the upgrade (see the Ohme vs Sync Energy comparison or the Ohme vs Cord Zero comparison for the detail). Both handle fixed off-peak windows well: Octopus Go at 8.5p/kWh from 00:30–05:30, EDF GoElectric at 6.99p/kWh from 23:00–06:00, and similar. The Sync Energy's TariffSense and the Cord Zero's EV tariff integration both manage scheduled charging competently.

The apps are another matter. Neither is polished. The Sync Energy app migrated away from Monta, which confused early adopters, and the current platform is functional rather than elegant. The Cord AI app is in a similar bracket — it works, it schedules, it does not delight. If app quality matters to you, both sit a tier below the Ohme and Tesla experiences.

The verdict

Buy the Sync Energy Wall Charger 2 if:

• You want the cheapest smart tethered charger with a 7.5-metre cable
• Your Wi-Fi reaches the charger location reliably, or you can run Ethernet
• You have solar panels and want CT clamp diversion included at no extra cost

Buy the Cord Zero if:

• Your broadband is patchy or the charger sits far from the router
• You want the fullest built-in safety suite to minimise install labour and cost
• The current promotional five-year warranty is still running when you order

For most buyers — particularly those without Ethernet to the charger and without strong feelings about cable length — the Cord Zero is the more considered choice. Its £73 premium tends to vanish on the install invoice, and its 4G failover solves a problem you do not want to diagnose six months after fitting. The Sync Energy earns its place for budget-conscious buyers with good Wi-Fi and a long run to the car. Both are competent; one removes more doubt.