200A vs 400A Electrical Panel: Which Do I Need? (Salem, OR Guide)
By Wire Smart Inc. · Updated 2026-05-24 · Oregon CCB #215974 · BCD #C1787
Short answer: 200A is the right call for almost every modern Salem single-family home — including heat pump and one EV charger. You really need 400A when you're combining two EVs, an ADU on the same meter, or heat pump + EV + hot tub + shop all on one service. Below is a real Salem load calculation you can compare your house against.
Real Salem load example — 4-bedroom, all-electric
This is a recent Salem load calculation we ran for a homeowner debating 200A vs 400A. After NEC demand factors are applied, total continuous demand came in at ~178A — inside 200A, but with no headroom for a second EV charger. Adding EV #2 pushed it to ~218A, which is when 400A becomes the right call.
| Load | Connected Amps |
|---|---|
| HVAC heat pump (3-ton) | 20A continuous |
| Electric water heater | 20A |
| Electric range / oven | 40A |
| Electric dryer | 30A |
| Level-2 EV charger #1 | 40A continuous |
| Level-2 EV charger #2 | 40A continuous |
| Hot tub | 50A |
| Shop sub-panel | 60A |
| Lighting + receptacles (NEC) | ≈30A |
Connected amps before demand factors. NEC 220 demand calculations reduce most loads — see your actual quote for the math on your home.
When 200A is the right call
- Standard single-family Salem home, gas or heat-pump heating
- One Level-2 EV charger (or two with load management)
- Standard electric appliances (range, dryer, water heater)
- Detached shop with modest 30–60A sub-panel
When 400A starts to make sense
- Two Level-2 EV chargers running simultaneously without load management
- ADU on the same meter as the main house
- Heat pump + EV + hot tub + shop combined on one service
- Full all-electric conversion of a 3,500+ sq ft home
- Light commercial / live-work properties
Frequently Asked Questions
Is 200A enough for a modern Salem home?
For most Salem single-family homes — yes. 200A handles HVAC, electric water heater, range, dryer, and one Level-2 EV charger comfortably. You start to feel tight when you add a second EV charger plus a hot tub plus a shop sub-panel on the same service.
When does 400A actually make sense?
Four scenarios drive most Salem 400A upgrades: (1) heat pump + EV + hot tub + shop combined, (2) two EV chargers running simultaneously, (3) ADU on the same meter as the main house, or (4) all-electric conversion of a larger home where gas appliances are being replaced.
Can I just add a sub-panel instead of going to 400A?
Sometimes. A sub-panel adds breaker space but does NOT add service capacity — the main 200A service is still the ceiling. If your load calculation comes in under 200A, a sub-panel for the shop or ADU is the cheaper move. If you're over 200A continuous, you need a service upgrade.
What's the cost difference between 200A and 400A in Salem?
200A residential upgrades typically run $2,500–$4,800 in Salem. 400A service runs $6,500–$9,500 — the meter base, panel(s), and service-entrance conductors are all heavier. Most Salem homes don't need 400A; the calculation is worth running before you spend the extra.
Will load-management EV chargers let me stay on 200A?
Often, yes. Wallbox Pulsar Plus, Emporia, and Tesla Wall Connector with Power Sharing can throttle charging based on whole-home load — that single feature has saved a lot of Salem homeowners from a 400A upgrade.
Does a heat pump push me to 400A?
Almost never on its own. Modern Salem cold-climate heat pumps draw 15–25A continuous — well within a 200A budget. Heat pump PLUS EV plus shop is when the math starts getting tight.
Can Wire Smart run the load calculation for me?
Yes. A NEC-compliant load calculation is part of every panel-upgrade estimate. We size for what you actually plan to add — heat pump, EV(s), hot tub, ADU — not just what's on the wall today.