https://wccftech.com/iphone-11-fast-charging-22-watts/

Although all Apple smartphones since the iPhone 8 support 18W fast charging, the company always bundled in a 5W chargers with its devices. Fortunately for users wanting to upgrade this year, that has changed with this year’s iPhone 11 Pro and iPhone 11 Pro Max as they ship with an 18W adapter. However, that certainly doesn’t mean that 18W is the upper limit on iPhone 11 fast charging as a new report says that all three models can actually obtain a higher charge limit.

According to a post on the Chinese social networking website Weibo, the iPhone 11 fast charging touches 22W+. This means that if you use the 18W charger that comes out of the box of the more expensive iPhone 11 Pro and iPhone 11 Pro Max, you will probably be missing out by around 4 watts of additional power. As mentioned before, this applies to all three phones in the range. Regardless, if you do plan on purchasing a charger that’s capable of delivering a higher wattage, it’s important that the accessory is from a reputable brand.