Horstmann (Secure) Tiara Programmer
The Tiara has all the programme capability and features of the 425 Diadem but without the indicator lights.
The Tiara is ideally suited for both gravity systems and fully pumped systems with either zone or mid-position valves.
A new backplate is included with the 425 Tiara.
This programmer has been rebadged and sold as:
Honeywell ST1000 Newlec NL425T
Compatible alternatives with same backplate & wiring:
Horstmann H21XL - 24 Hour digital programmer with boost holiday & 5 year warranty
Horstmann H27XL - 7 day digital programmer with boost holiday & 5 year warranty