Securing the house (empty houses) and its contents is the duty of the executor when a property is part of an estate. This includes protection from theft, vandalism, and other hazards.
In the cold months, it is sensible to drain down the water system unless the central heating system is kept on.
Basic precautions such as security lights, timers for switching lights, and stopping milk and newspaper deliveries are easily done. Also consider telling the neighbours who the keyholder is. Executors securing the house and contents should remove valuable items and arrange secure storage elsewhere. Especially as insurance cover for contents on empty property is usually very restrictive.