A developer of a team posted a couple of images of a Greek fire machine for a game that is situated between 1212 AD and 1500 AD. It consist of a boiler with a hose, mounted on a wall. There is also a similar version for ships.

• First question. Does the sources indicate the use of these weapons in this specific time frame?
• Second question, quoting the developer: " P.S: What's the real-life historically plausible and gameplay-suitable range for these things anyway? " What is the probable range these weapons?

If you have other things to mention about the looks or other characteristics about the machine itself, feel free to indulge yourself.

Here are two images of the machine mounted on the Theodosian Walls of Constantinople.

Image 01
Image 02

Source.