What’s this movie please

In this movie a family have a robot/cyborg that is commissioned to look after their HOUSE, a guest visits and drops a vase or similar and the robot kills him as he thinks he has hurt the house. The home owners try to stop him but he then thinks they have turned against him so try to kill them too. Sure he tries to gas them. Pretty sure he is defeated in the end by plunging into a swimming pool

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