Simpson & Partners Home 7 vs Cord Zero

The £176 question — and what it actually buys

The Simpson & Partners Home 7 costs £649. The Cord Zero costs £473. That £176 gap is the headline, but it understates the real distance between these two because the Cord's built-in safety hardware — RCD, PEN fault detection, surge protection — typically saves another £150–£250 at the consumer unit. Add those install savings and the total cost difference can approach £400.

What the Simpson offers in return is physical. Anodised aluminium, UK manufacturing, optional Accoya wood or Cotswolds Green finishes, and a 10-year enclosure warranty — the longest on the market. What the Cord offers is functional. Dual Wi-Fi plus 4G with automatic failover, OCPP 1.6J, RFID access control, and a broader smart-tariff roster.

• Simpson & Partners Home 7 — the charger you buy because you care what's bolted to the front of your house. Premium enclosure, decade-long shell warranty, three-phase option.
• Cord Zero — the charger you buy because you want reliable connectivity, lower installed cost, and the widest safety suite in the box.

Connectivity and tariff support favour the Cord Zero

The Cord Zero's dual Wi-Fi and 4G with automatic failover is the single most relevant spec difference here. A charger that drops offline cannot follow a schedule, cannot respond to tariff signals, and cannot report energy use. The Simpson relies on Wi-Fi alone. If your garage is at the far end of the garden, or your router sits two walls and a floor away, the Cord removes that variable entirely.

On tariffs, both chargers handle the basics — Octopus Go, EDF GoElectric, scheduled charging overnight. The Simpson supports Intelligent Octopus Go scheduling directly, which is useful. The Cord covers Intelligent Go too, alongside OVO Charge Anytime and British Gas EV Power. Neither charger matches the Ohme Home Pro for half-hourly optimisation on Octopus Agile, but for fixed-window off-peak tariffs both do the job.

The Simpson's case: enclosure warranty and aesthetics

Strip away the connectivity argument and the Simpson makes a different kind of sense. Its 10-year enclosure warranty is genuine peace of mind for anyone mounting a charger on an exposed, street-facing wall — aluminium does not crack, yellow, or warp the way some polymer housings can over a decade of British weather. The finish options (particularly the wood-inlay variants) put it in a different visual class from the Cord's functional black box.

The caveat is precise and important: that 10-year figure covers the enclosure, not the electronics inside it. The internals carry a 3-year warranty — the same as the Cord's standard term. Cord is currently shipping with a promotional upgrade to five years, which — if still running when you order — gives the cheaper charger the longer electronics cover. Check before buying.

The Simpson also offers a 22kW three-phase option, rare at this price. Fewer than 5% of UK homes have three-phase supply, but if yours does, the Simpson becomes a more interesting proposition. The Cord is single-phase only, capped at 7.4kW.

Install cost widens the gap

Both chargers quote OZEV-approved status, so grant-eligible renters and flat owners can claim the £500 towards their install. For the Cord Zero, that £500 covers the £473 unit price outright and chips into the install costs too. For the Simpson at £649, the grant still leaves £149 on the unit alone before installation.

Beyond the grant, the Cord's bundled protection components — built-in RCD, PEN fault detection, SPD — mean the electrician does not need to fit them at the consumer unit. That typically saves £150–£250 on labour. The Simpson requires standard installation work, quoted at £400–£600. The Cord quotes £400–£500 before the component savings. On total installed cost, the Cord can land several hundred pounds below the Simpson.

The verdict

Buy the Simpson & Partners Home 7 if:

• Your charger will be visible from the street and you want materials that match the house
• You have three-phase supply and want 22kW charging
• A 10-year enclosure warranty matters more to you than a lower purchase price

Buy the Cord Zero if:

• You want the lowest realistic total installed cost in this pairing
• Your Wi-Fi signal to the charger location is uncertain or weak
• You prefer built-in safety hardware and a potentially longer electronics warranty

For most buyers on a single-phase supply, the Cord Zero is the more rational purchase. It costs £176 less, saves further on installation, stays online where other chargers might not, and does everything a smart home charger needs to do. The Simpson earns its premium only when the wall it hangs on matters as much as the car it charges — and for that smaller audience, it remains one of the better-looking options short of the Andersen A3 at £900. If design is the priority but £649 feels steep, the Andersen A3 vs Simpson comparison is worth a look.