Gas pipes were cut when thieves stole gas bottles from Rockbridge Caravan Park near Presteigne.
Thieves cut straight through pipes on the underside of a caravan to steal the two bottles sometime between 22 and 29 April.
Appealing for witnesses PC Bill Cowen of Dyfed-Powys Police said: "This type of crime is thankfully rare but in times of financial hardship these gas bottles could become a more common target."
Owners are advised to hide bottles from view or deter thieves with locked gates.
To give information to police call 101.
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