On Mon, 20 Mar 2017 19:14:02 +0200, Micky
wrote:

I'm renting a room from a woman and the power is 220 Volts. More than
once she has scorched one pin of her room heater's plug. The last
guy who replaced it adviced her to only turn on one of the two heater
halves.

I replaced the plug too and pointed out that if the receptacle is
loose, that's a problem too. She showed me that her bedroom socket
barely grips the plug or not at all.

She hasn't asked me yet to replace the whole socket, and even if I
did... the apartment was wired for internet cable, so it must have
been remodeled not that long ago, and I'm guessintg the electric
sockets were replaced too (I can ask her.)

So.... Is there a device one can put into a 220v. socket (receptacle)
that will expand and make a tight connection with a loose socket?

Or any other way around her problem?

You need to rewire that whole place immediately. I can smell the wood
charring around those wires right now. Either begin rewiring IMMEDIATELY
(as in TODAY), or just toss a gallon of gasoline in that place along
with a lit match. The life you save may be your own, as well as that of
all your neighbors.