What Should I Consider Before Replacing Gas Appliances with Electric?
Before replacing gas appliances with electric, look beyond the individual appliance. Confirm that your home’s electrical foundation can support the combined new demand, choose the right technology for each job, and plan the electrical, plumbing, and gas work in the right order.
Moving to electric can improve efficiency, simplify how your home uses energy, and make future technologies easier to integrate. The best result comes from treating the change as one coordinated home-energy decision rather than a series of unrelated appliance replacements.
Consider the whole home, not just one appliance
Gas may currently provide some or all of your cooking, hot water, and space heating. Because those loads sit outside the electrical system, replacing them with electric alternatives changes how much electricity your home may need at busy times.
This is not simply a question of annual electricity use. An induction cooktop can draw considerable power for short periods, while water heating and space heating may operate for longer. A heat pump water heater generally uses much less electricity than a standard resistance cylinder, but its suitability still depends on your household, its location, and the way you use hot water.
What matters is how the new appliances will operate together with existing loads.
1. Choose the right electric alternative for each job
For cooking, induction is efficient, responsive, and easy to control. You may need compatible cookware, and the exact cooktop model will influence the electrical requirements. Good extraction remains worthwhile for steam, moisture, and cooking odours even when there is no gas flame.
For hot water, compare a standard electric cylinder with a heat pump water heater. Consider household size, peak hot-water use, recovery time, available space, pipe routes, outdoor temperature, noise, and where the equipment can be installed.
For space heating, heat pumps are usually the main electric alternative. Correct sizing and placement should reflect the room layout, insulation, and how heat moves through the home.
2. Check whether the electrical foundation can support the change
Before appliances are purchased, the existing electrical system should be understood. An assessment may consider:
The capacity of the incoming supply
The main switch and switchboard
Circuit protection and available switchboard space
The condition of existing wiring and earthing
The routes available for new cables
Other major loads, such as an EV charger, spa, workshop, or additional heating
Some homes can accommodate the change with new circuits and carefully selected appliances. Others may need switchboard modernisation, changes to distribution, or an upgrade to the electrical supply.
In some cases, smart controls or sensible load management can reduce peak demand and avoid unnecessary work.
The important point is to establish this before committing to appliances, not after they arrive.
3. Plan the new circuits and cable routes early
Induction cooktops, hot-water systems, and heat pumps may each need their own electrical supply. The cost and disruption can depend as much on the cable route as the appliance itself.
If the change is part of a renovation, planning while walls and ceilings are accessible can make the work cleaner and reduce repeated labour. It also allows the electrical work, plumbing, and cabinetry to be coordinated before installation begins.
4. Include safe gas disconnection in the project
Removing a gas appliance is not only an electrical job. A currently licensed gasfitter should disconnect, cap, or alter the gas installation, while a licensed electrician completes the new electrical work. Hot-water changes may also need a plumber.
In Dunedin, gas appliances generally use bottled LPG because reticulated natural gas is not available in the South Island. If you are removing your final gas appliance, consider the whole exit process, including the bottles, regulator, pipework, supplier arrangements, and any ongoing bottle-related charges.
Coordinating the trades avoids leaving redundant services, unfinished connections, or unclear responsibility between contractors.
5. Allow for what you may add next
Replacing gas appliances can be one part of a larger change in how your home uses power. You may also be considering EV charging, solar, a home battery, additional heat pumps, or a future renovation.
Those plans should be included in the load assessment now. A well-planned electrical foundation can allow new appliances to be added in stages without repeatedly altering the switchboard or retracing the same cable routes.
Hot-water timing and other controllable loads may also be coordinated later with solar generation or off-peak electricity pricing.
When is a proper electrical assessment worthwhile?
An assessment is especially useful if you plan to replace more than one gas appliance, have an older switchboard, do not know the capacity of your supply, or expect to add an EV charger or solar in the future.
A Riverline Power Integrity Review™ looks at Capacity, Protection, Distribution, Condition, and Future Ready planning. It gives you a clear view of the electrical foundation you already have and a practical pathway for making changes in the right order.
The takeaway
Replacing gas with electric is not simply an appliance swap. Start by understanding the loads you are moving onto electricity, choose efficient appliances that suit the home, and coordinate the new circuits, gas removal, and future plans before work begins.
Done in the right order, the result is a simpler, more efficient home with an electrical foundation ready to support what comes next.