The 425 Tiara is a twin circuit, hot water and central heating programmer, has 16 programmes available for fully pumped systems, including independent programming of heating and hot water and 10 programmes for gravity HW / pumped CH systems. The Tiara is ideally suited for both gravity and fully pumped systems with either mid-position or zone valves.
Simple to use with easily understood settings adjusted in seconds
Easy to install using a nine pin backplate
Advance control to allow manual override ON or OFF