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I'm looking for the name of a horror/slasher film (probably the latter) from the '70s or early '80s that features a woman who sleeps with a knife under her pillow in one scene and in another towards the end she pulls the gas line out of a wall mounted water heater in a bathroom (?) and uses that to blow up her attacker?

I remember seeing scenes from this movie when I was in kindergarden in the mid-'80s on what I assume was broadcast television so it's possibly a B-Movie.  I remember little about it except for a scene where a girl (maybe brunette in her late teens/early 20s) hides a butcher knife under her pillow which she then stabs her attacker using and then later she is trapped in a bathroom and pulls a gas line out of what I now know might be a wall mounted water heater (I hadn't seen one of these until I travelled in Europe in my 20s so until then I always thought it was odd that she had access to a gas line in the bathroom - this might indicate that this film comes from Europe though there weren't subtitles and I don't remember it being dubbed).  She then uses this to blow up her attacker but I don't remember if she survied.  As I said I was pretty little and only saw a little bit of this movie before some adult probably changed the channel or told me to go to bed.  The question of its title has been rolling around my head for 30 years, please help!
asked Jul 20, 2015 in Name That Movie by tsuyoikuma (113 points)
retagged Jul 20, 2015 by tsuyoikuma
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