Burglars stole two boilers after breaking into homes under construction near Matlock.
The offenders smashed windows at the houses, being built off Main Street, in Birchover, and searched inside.
They then removed two Ideal Logic 30 combi boilers from the houses.
The burglaries happned between 1pm on Saturday, February 28 and 8am on Monday, March 2.
Police are urging anyone who might have been offered a boiler for sale since then to call them on 101.