The Worcester Greenstar Comfort Plugin Programmer is a twin channel digital programmer that is plugged directly in to your boiler. It provides accurate timing for your heating and hot water, with the ability to have different settings for each day of the week to suit your requirements. Each day can be programmed for the heating and hot water to come on and off up to 3 times. Its clear back-lit display and easy-to-use menu enables you to increase your heating efficiency with the added benefit of automatic adjustment to British summer/winter time.