Yes, great bathroom heaters Hamid.
You just have to make sure it does not fall into the bath when climbing in.
Most of these were 600 watts and were plugged into the lighting supply via a bayonet adaptor. They were very popular in the 30's 40's and 50's only superseded by the much safer heat lamp.
We actually had one of these in the very cold bathroom as a child. It was plugged into the bathroom light via a 2 way adaptor. We only had a single 2amp socket in the war requisitioned flat that my parents moved into in 1946. [My parents original flat, moved into shortly after getting married in 1936 in Haydons Road Wimbledon, was burnt out during WW2.]
It was of course NOT balanced on the edge of the bath as my crazy picture shows..[took that a few moments ago.] Very cold times the 1950's. John.