Set of 5 Short Heat Bulbs for EdenPURE Suntwin Infrared Heaters After-market replacement infrared quartz bulbs with lifetime warranty so buy with confidence. Used in all EdenPURE generation 3 (GEN 3) or older heaters. 7" wire leads. Element itself measures 6.25". Replaces EdenPURE MK 2633 bulb. The 8" bulb, which rarely goes out, is not included and sold separately.