Ohme Home Pro vs CTEK Chargestorm Connected 3: £551 apart, different planets

£551 and a phase apart

The Ohme Home Pro costs £535. The CTEK Chargestorm Connected 3 costs £1,086. That is a £551 gap — wider than the price of several complete chargers on the market. It demands a reason, and the reason is three-phase power.

• Ohme Home Pro — £535, single-phase, direct smart-tariff integration with Octopus, OVO, and British Gas. The charger that saves you money while you sleep.
• CTEK Chargestorm Connected 3 — £1,086, three-phase native at 22kW, MID-approved metering, OCPP 2.0.1, built-in Type B RCD. The charger engineered for a commercial spec sheet.

If your house has a standard single-phase supply — and the vast majority of UK homes do — the CTEK delivers the same 7.4kW as the Ohme, in a heavier box, without the tariff smarts, for twice the money. That is not a close call.

The Ohme's tariff advantage is the whole story on single-phase

The Ohme Home Pro talks directly to Octopus Intelligent Go, OVO Charge Anytime, and British Gas Electric Drivers. On Intelligent Go, it chases 7p/kWh slots across the overnight window — 23:30 to 05:30 — without you touching anything. On Octopus Agile, it picks the cheapest half-hours automatically. The CTEK cannot do any of this. Its scheduling runs through third-party OCPP platforms like Monta, which means manual timer-style configuration rather than live rate-chasing. You can set a window — charge between midnight and five — but you cannot ask it to follow a price signal.

On a fixed off-peak tariff like Octopus Go at 8.5p/kWh, a simple timer is fine. But the Ohme still handles that natively through its own app, with per-session cost tracking and a colour display on the unit. The CTEK requires a separate app ecosystem. For a home user who just wants to plug in and pay less, the Ohme is the simpler, cheaper, smarter path.

When the CTEK earns its price

Three-phase supply changes the arithmetic. On three phases, the CTEK delivers 22kW — roughly three times the single-phase rate. A 60kWh battery goes from empty to full in under three hours rather than eight. If you drive high mileage, charge mid-day between trips, or share the charger across multiple vehicles on a commercial premises, that speed matters.

The CTEK also carries hardware that the Ohme does not. Its built-in MRCD Type B protection (30mA AC and 30mA DC) saves the cost of an external RCD — typically £150–£250 at install. Its MID-approved energy meter is Eichrecht-compliant, which matters if you need auditable billing — a landlord recharging tenants, or a small business reclaiming costs. OCPP 2.0.1 and ISO 15118 readiness mean it can talk to future back-end systems and support plug-and-charge authentication. The five-year warranty is two years longer than the Ohme's three.

All of this is useful. None of it is useful to someone on a single-phase terrace in Bristol who wants cheap overnight charging on Intelligent Go.

If three-phase is your situation, the CTEK's natural rival is the Zaptec Go 2 at £500 — far cheaper, also three-phase capable, also OCPP-ready. The Zaptec lacks the MID meter and built-in Type B RCD, so the installed cost gap narrows once your electrician adds those separately, but it is still worth comparing. That pairing is covered in the Ohme Home Pro vs Zaptec Go 2 comparison.

Installation cost widens the gap further

The Ohme's standard install runs £400–£500. The CTEK's runs £900–£1,300 — higher because of the unit's 24kg weight, dual Ethernet wiring if you want it, and the likelihood that a three-phase install involves a longer cable run or sub-main upgrade. Total outlay: roughly £935–£1,035 for the Ohme, roughly £1,986–£2,386 for the CTEK. The £500 OZEV grant (available to eligible renters and flat owners) applies to both, but it does not close a gap that wide.

The verdict

Buy the Ohme Home Pro if:

• Your home is single-phase — which almost certainly means you
• You want automatic smart-tariff optimisation with Octopus, OVO, or British Gas
• You would rather spend £535 than £1,086 for the same 7.4kW output

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 expense reclaim
• You value OCPP 2.0.1 and a five-year warranty over first-party tariff integration

For the typical UK Tesla owner on a single-phase supply, the Ohme Home Pro is the right charger. It costs half as much, installs for less, and does the one thing that saves real money every night — talks to your energy supplier so you do not have to. The CTEK is a fine piece of engineering aimed at a different building.