Choosing the right electrical panel is one of the most important decisions in any residential wiring or service-upgrade job. For most homes across the Greater Toronto Area, the choice comes down to a 100-amp or 200-amp Eaton main-breaker panel. This guide breaks down the difference, when each makes sense, and what to look for — so you can spec the right loadcentre the first time.
What a main-breaker panel actually does
Your electrical panel (also called a loadcentre or breaker box) is the hub that distributes power from the utility service to every circuit in the building. A main-breaker panel includes a single main breaker that shuts off all power and sets the panel’s amperage rating. Eaton’s residential loadcentres are among the most widely installed in Canada, valued for reliable bus construction and broad breaker compatibility.
The panel’s amperage — 100A or 200A — is the maximum current it can safely carry. That number should be matched to the building’s total electrical load, not just picked by habit.
100A vs 200A Eaton panel: the core difference
The headline difference is capacity. A 100A panel supplies up to 100 amps of service; a 200A panel doubles that to 200 amps and typically offers more breaker spaces for future circuits.
| 100A Eaton Panel | 200A Eaton Panel | |
|---|---|---|
| Service capacity | Up to 100 amps | Up to 200 amps |
| Typical use | Smaller or older homes, condos, no electric heat | New builds, larger homes, electric heat, EV charging |
| Breaker spaces | Fewer circuit positions | More positions for future circuits |
| Future-proofing | Limited headroom | Room for EV chargers, heat pumps, additions |
| Cost | Lower up front | Higher, but avoids a second upgrade later |
When a 100A panel is enough
A 100-amp service still meets the needs of many homes. It is often the right call when:
- The home is modest in size with gas heating, a gas range, and a gas water heater
- There is no electric vehicle charger, hot tub, or electric heat planned
- You are replacing an aging panel like-for-like and a load calculation confirms 100A is adequate
Our Eaton 100A 120/240V panel with main breaker is a common choice for these installs.
When to choose a 200A panel
A 200-amp service has become the default for new construction and major renovations — and demand is growing as homes electrify. Choose 200A when the property includes, or may soon include:
- EV charging — a Level 2 charger draws significant continuous load
- Electric heat or a heat pump — including mini-splits and backup electric heat
- Electric range, dryer, and water heater running together
- Larger square footage, a finished basement, or a future addition
The Eaton 200A 120/240V panel with main breaker gives you the capacity and the extra breaker spaces to grow into. For contractors, spec’ing 200A up front is often cheaper than returning for a second service upgrade in a few years.
Don’t forget the breakers and accessories
A loadcentre is only half the order. You will also need matching branch breakers, and it is good practice to cap unused openings with filler plates for a clean, code-compliant finish. Browse our circuit breakers and the full panels & loadcentres selection to complete the package in one stop.
A note on Ontario code and permits
In Ontario, electrical service and panel work must comply with the Ontario Electrical Safety Code and requires notification to the Electrical Safety Authority (ESA). Panel and service upgrades are normally performed by a Licensed Electrical Contractor, and the correct panel size should be confirmed with a proper load calculation. Always consult a licensed electrician before purchasing or installing a service panel.
Frequently asked questions
Is a 100-amp panel enough for a house?
For a smaller home with gas heating and no major electric loads, 100A is often sufficient. However, if you plan to add EV charging, electric heat, or a heat pump, a 200A service is the safer long-term choice. A licensed electrician’s load calculation is the definitive answer.
Can I upgrade a 100A panel to 200A myself?
Service upgrades involve the utility connection and must meet the Ontario Electrical Safety Code with ESA notification. This work should be carried out by a Licensed Electrical Contractor — it is not a typical DIY project.
How many circuits does a 200A Eaton panel hold?
It depends on the specific loadcentre configuration, but 200A panels generally provide more breaker positions than 100A models, leaving room for future circuits. Check the space count on the product listing or ask our team for the model that fits your circuit plan.
Eaton or Siemens panel — does it matter?
Both are quality, code-approved brands widely used across the GTA. Eaton and Siemens use different breaker types, so match your breakers to the panel you choose. We stock both Eaton and Siemens panels and can help you standardize on one system.
Buy Eaton panels wholesale in Vaughan & the GTA
CSG Electric Supply stocks Eaton 100A and 200A panels, breakers, and accessories at wholesale prices, with same-day pickup from our Concord showroom at 1300 Alness St, Unit 3. Whether you are wiring a single home or supplying a full project, we can get you the right loadcentre fast. Contact our team or request a quote to get started.
