TPOne-M programmable room thermostat with a large LCD indicating function mode, time and temperature. Features a timing circuit for controlling up to 3 domestic hot water on/off times per day, 4 selectable comfort modes with up to 3 home heating time/temperatures per day, optimised or delayed start, on/off or chrono-proportional control, manual override, boost for 1, 2 or 3 hours, external sensor input, service interval option, BST/GMT auto time update and frost protection.