What is the original Watt (W) value in original i phone 8+ charger??

iPhone 8 and iPhone 8 Plus usually shipped with 5W chargers.

Details: About Apple USB power adapters - Apple Support

Higher wattage charging is supported.

Details: Fast charge your iPhone - Apple Support

iPhone 8 and iPhone 8 Plus is supported as far as iOS 16.

The iPhone 8+ originally used a 5W adapter, but a 12W adapter was included with later versions.....according to Mactracker.

The iPhone 8+ that I purchased shortly after it was introduced included a 5W adapter.

The charger that was shipped with the iPhone 8+ was a 5 Watt charger.

Axel F.