Ohme Home Pro vs Cord Zero: Which Smart Charger Saves You More?

Two Smart Chargers, £20 Apart — So What Actually Separates Them?

The Ohme Home Pro at £535 and the Cord Zero at £555 are about as closely matched on paper as two chargers can be. Same 7.4kW output. Same 5m tethered cable with 8m upgrade options. Same 3-year warranty (though the Cord has a trick up its sleeve there). Both include built-in 4G connectivity with a SIM card, and both integrate with smart energy tariffs.

So why does one exist if the other already does the job? Because the differences are beneath the surface — and they matter depending on how you charge.

In a nutshell:

• Ohme Home Pro: The tariff automation specialist. If you want your charger to think about electricity prices so you never have to, this is the one.
• Cord Zero: The reliability-first option. Better built-in safety hardware, the most dependable connectivity, and potentially lower total installation costs.

Does the Ohme Home Pro Actually Save More on Energy Bills?

Both chargers support smart tariff scheduling, but they approach it very differently. The Ohme connects directly to your energy provider's API — Octopus, OVO, British Gas, and others — and automatically distributes your charging across the cheapest half-hour slots overnight. It doesn't just charge during a fixed off-peak window; it actively optimises session by session.

The Cord Zero supports EV tariffs too, including Octopus Go, but its integration is more conventional: you set a schedule, and it charges during the cheap hours. That works perfectly well on a flat off-peak tariff like Octopus Go's 00:30–04:30 window. Where the Ohme pulls away is on variable tariffs like Octopus Agile or Intelligent Go, where rates shift every 30 minutes. The Ohme tracks those fluctuations automatically. The Cord doesn't — at least not with the same granularity.

If you're planning to use Intelligent Go specifically, the Ohme is the obvious pick. Octopus officially recommends it for that tariff. If you're happy setting a fixed overnight schedule on a simpler tariff, the Cord Zero handles that just fine.

Cord Zero's Hidden Installation Advantage

Here's something that rarely gets enough attention: the Cord Zero packs in a full safety suite — built-in Type A RCD, PEN fault detection, surge protection, and overvoltage protection. The Ohme Home Pro has PEN fault detection but relies on your consumer unit for RCD protection.

Why does this matter? If your home's consumer unit doesn't already have a suitable RCD, your installer will need to add one. That can add £50–150 to the installation bill. The Cord Zero's built-in RCD can sidestep that entirely. So while the charger itself costs £20 more, your total installed cost could actually be lower.

Both chargers quote standard installation at £400–500, but real-world costs depend on your home's existing electrical setup. The Cord Zero simply reduces the variables.

App Experience: Ohme's Clear Lead

The Cord Zero's app — Cord AI — does the basics. You can schedule sessions, monitor energy use, and manage access via RFID. But reviews consistently describe it as functional rather than polished. It lacks the session-by-session cost breakdowns and the intuitive tariff visualisation that the Ohme app delivers.

The Ohme app shows you exactly what you paid per session, how much you saved versus a flat rate, and lets you set charge targets by percentage or departure time. If you're the sort of person who likes seeing the numbers — and if you're reading a comparison this detailed, you probably are — the Ohme's software experience is meaningfully better.

That said, the Cord Zero's OCPP 1.6J support gives it a future-proofing edge. OCPP is an open protocol that could allow third-party apps or energy platforms to control the charger down the line. The Ohme operates within its own ecosystem, which is slick but closed.

The Warranty Situation

Both chargers come with a 3-year warranty as standard. But the Cord Zero is currently offering a free upgrade to 5 years. That's a significant sweetener — an extra two years of cover for nothing. The catch, as flagged in the data, is that this is promotional and could end at any time. If you're ordering soon, it's a genuine differentiator. If you're reading this months from now, check whether the offer still stands.

The Ohme's 3-year warranty is solid and includes the built-in 4G SIM for the full duration. No complaints there, but no bonus either.

Which Should You Buy?

Buy the Ohme Home Pro if:

• You're on or planning to join Octopus Intelligent Go or Agile
• You want fully automated tariff optimisation without manual scheduling
• A polished app with detailed cost tracking matters to you
• You have solar panels and want built-in diverting

Buy the Cord Zero if:

• You want the most reliable connectivity with automatic Wi-Fi/4G failover
• Your consumer unit lacks a suitable RCD and you want to minimise installation costs
• The 5-year warranty promotion is still available when you order
• You prefer open standards (OCPP) for future flexibility

For most Tesla owners already on or considering a smart energy tariff, the Ohme Home Pro's tariff automation is the stronger long-term money saver. But if you want a charger that's robust, well-connected, and potentially cheaper to get on the wall, the Cord Zero is an excellent alternative that won't leave you short. Check our best smart EV charger guide if you want to see how both stack up against the wider field.