The man and his wife were sleeping at 3.30am, when the man was awakened by the trio in his bedroom.
Springs police spokesman Capt Johannes Ramphora says one of the robbers was armed with a firearm.
The armed suspect assaulted the victim on his head and back with the firearm, while the other two searched the house.
The suspects took two cellphones, blankets, a jewellery box and a wallet, and left the scene.
A case of house robbery was opened at the police station.
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