The BeerMKR takes a week to make a gallon, with makers claiming each new batch can be started in just five minutes.
Co-founder Aaron Walls said: "Put a brew pouch into the machine, fill the system with water, then add your ingredients. Open the app and press brew and the machine takes it from there." The wifi-connected gadget controls temperature and carbon dioxide levels.
"You will get notifications on your phone about what's happening inside your brew or if you're needed to pitch yeast or add dry hops," said Walls.
The machines cost $445, with the beer then costing $2.40 a pint - cheaper than craft ales but more expensive than some mass-produced beers available in supermarkets.
Traditionally, home-brewers have had to disinfect their kit, but the LG system is self-cleaning, while BeerMKR's parts can be put in a dishwasher.
However, not everyone is convinced - not least because nine pints a fortnight might not slake the thirst. Peter Robinson, of the National Association of Wine and Beer Makers, said: "I don't think you can really call this brewing. This takes all the fun and glorious uncertainty out of our hobby.
"I don't think this will appeal to genuine home-brewers, but I suspect there is a market among those who like gadgets.'