The ornamental design for a spaceheater with decorativecandles, as shown and described.
FIG. 1 is a top, front, and left side perspective view of a space heater with decorative candles showing my new design:
FIG. 2 is a top plan view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a left side elevational view thereof; and,
FIG. 7 is a right side elevational view thereof.
The broken-line disclosure of decorative candles is understood to form part of the article in which the claimed design is embodied, but which forms no part of the claimed design.