A new induction hob can look like a straightforward replacement until you check the electrical label. Induction hob power requirements vary widely: one compact model may run from a standard plug, while a full-width family hob may need a dedicated cooker circuit. Checking this before you order helps avoid installation delays, unexpected electrical work and the cost of returning a hob that is not suitable for your kitchen.
What are induction hob power requirements?
An induction hob uses electricity to create a magnetic field that heats the base of a compatible pan. It is fast, responsive and generally more efficient than a conventional electric hob, but it can draw a substantial amount of power when several zones are working at once.
A hob's power rating is usually shown in watts (W) or kilowatts (kW). One kilowatt equals 1,000 watts, so a 7.2kW hob has a maximum rated load of 7,200W. This figure is a useful starting point, but it is not the only number that matters. Your electrician also needs to consider the circuit rating, cable size, protective device, isolation switch and the overall condition of the existing installation.
For most UK homes, the mains supply is around 230V. As a simple guide, higher wattage means higher current demand. A 3kW plug-in hob draws close to the practical limit of a 13-amp socket. A 7kW hob is in a different category and will normally require a suitably rated fixed connection rather than a standard plug.
Plug-in versus hardwired induction hobs
The first choice is often determined by the electrics already available in the kitchen.
Plug-in models
Some smaller induction hobs are supplied with a fitted 13A plug and are designed for a normal wall socket. Their total power is commonly limited to around 3kW. This can be a practical option for a compact kitchen, replacement project or property where adding a cooker circuit would be disruptive.
The trade-off is cooking flexibility. On a lower-powered model, you may not be able to use every zone on maximum power at the same time. The hob may share power between zones automatically, reducing the output available to each one. That is not necessarily a problem for everyday cooking, but it is worth understanding if you regularly cook for a large household.
Never assume a hob can be plugged in just because it is 60cm wide or has four zones. Always read the product specification and installation instructions. Two hobs that look almost identical can have very different connection requirements.
Hardwired models
Many standard four-zone induction hobs have a total connected load of roughly 6.4kW to 7.4kW. Larger five-zone, 80cm or 90cm models can be higher again. These are normally hardwired to a dedicated cooker circuit through a suitable cooker control unit or isolator.
A 32A circuit is common for many domestic induction hobs, but it is not a universal answer. The manufacturer's stated requirements take priority, and an electrician must confirm whether your cable, circuit breaker and consumer unit are suitable. Some installations may need a different circuit arrangement or an upgrade, particularly in older homes.
Hardwiring is not a DIY task. Electrical work in kitchens needs to be carried out safely and in line with the relevant building and wiring requirements. A qualified electrician can assess the installation, make the connection correctly and advise whether certification or notification applies to the work.
Why the maximum power rating can be misleading
A hob rated at 7.2kW does not continuously pull 7.2kW every time you cook. The maximum figure assumes that all cooking zones are working at full output, often with boost functions selected. In real use, elements cycle and power levels change as food heats and simmers.
However, the maximum rating still matters when planning the circuit. It tells you the potential demand of the appliance and helps an electrician calculate the installation safely. Do not rely on the idea that you will only use one ring at a time. A future buyer, tenant or family member may use the hob differently, and the circuit must be appropriate for the appliance as installed.
Electricians may apply diversity when assessing cooker loads. Put simply, this recognises that not every cooking zone is usually operating at full power continuously. The calculation is professional judgement based on the wiring rules and the property, rather than a reason to fit a high-powered hob to an unsuitable circuit.
Check your existing cooker circuit before buying
If you are replacing an older electric ceramic hob or cooker, there may already be a dedicated circuit in place. That can make fitting an induction hob more straightforward, but it should still be checked. The age of the wiring, rating of the protective device and condition of the cooker switch all matter.
A gas hob replacement can be more involved. Your kitchen may have only a standard socket nearby, with no dedicated high-current circuit. It is entirely possible to install one, but factor the electrical work into your budget and timescale before choosing a powerful induction model.
Look for a cooker control unit or red cooker switch near the worktop, and a connection point behind or below the appliance. These are useful signs, not proof that the circuit is suitable. Avoid removing covers or trying to identify cable sizes yourself. A short visit from an electrician before you order can prevent an expensive mistake.
If you are planning a wider kitchen renovation, arrange the electrical assessment early. Moving a consumer unit, chasing cables into walls or fitting new circuits is far easier before cupboards, splashbacks and worktops are finished.
Hob size, zones and power sharing
More zones do not automatically mean a hob needs more electrical capacity, but there is usually a relationship. A compact two-zone model may suit a flat, smaller household or secondary kitchen. A 60cm four-zone hob is a popular everyday choice, while larger formats give more room for wide pans, griddle plates and batch cooking.
Pay attention to the individual zone outputs as well as the total connected load. A strong boost setting is useful for boiling a large pan quickly, but the hob may limit another zone while boost is active. This is known as power sharing or power management, and it is a normal feature on many models.
Some induction hobs allow an installer to set a lower maximum power level. This can be helpful where the available circuit has limited capacity, but it may reduce how many zones can run at high heat together. It is a sensible compromise in some homes, not a feature to select without checking the manufacturer's instructions and getting professional advice.
Other installation details that are easy to miss
Electrical capacity is only one part of induction hob installation. The cut-out dimensions in the worktop must match the model, and there must be adequate ventilation beneath the hob. Induction electronics need airflow, so drawers, ovens and internal cabinet panels may require specific clearances.
If the hob is being fitted above a built-in oven, check that both appliances are approved for that arrangement. The hob's instructions may specify a divider panel, minimum gap or particular ventilation route. A shallow worktop, thick stone surface or drawer unit directly below can also affect what will fit.
You will also need induction-compatible cookware. A simple magnet test is useful: if a magnet sticks firmly to the base, the pan is generally suitable. Flat-bottomed pans with a base close to the size of the cooking zone perform best. Aluminium, copper and glass pans usually need a magnetic base layer to work.
Do not forget the extractor hood. It normally has its own electrical connection and should not be added to the hob circuit unless an electrician has specifically designed the installation that way.
A practical buying checklist
Before choosing your new hob, confirm these points:
- The hob's total connected load in kW and whether it is supplied with a 13A plug.
- The manufacturer's required circuit rating, cable specification and connection method.
- Whether your kitchen has an existing dedicated cooker circuit that an electrician has confirmed is suitable.
- The worktop cut-out, clearance and ventilation requirements.
- Whether a lower power setting is available and what effect it has on simultaneous cooking.
- The size and type of pans your household uses most often.
A low-priced induction hob is only a good saving when it suits the kitchen around it. Compare the appliance specification with your available electrics before you buy, then ask a qualified electrician to confirm the connection. If you are weighing up different sizes or power ratings, the HomeWise Appliances sales team are here to help you narrow down a practical option that fits your cooking habits and your budget.
