A mains electricity (AC-powered) device designed to heat factory-sealed prep pads (skin cleansing pads typically containing alcohol or povidone iodine), with a pre-set maximum temperature (e.g., 55?C) for the purpose of warming the pads prior to use on a paediatric patient, notably to reduce the number of venous access attempts (needle sticks). The device is typically of tabletop design and includes a heat exchanger that uses electromagnetic radiation (e.g., radio-frequency, microwaves) to transmit heat to the packaged pads that have been placed in separate compartments within the device; it also includes temperature controls and/or alarms.