HORSTMANN H21XL 24HOUR CENTRAL HEATING TIMER

Horstmann H21XL 24hour Central Heating Timer Second generation programmer that offers 2 independent channels and feature improved display and easier programming. 5 Year Guarantee 3 Amp rated Two  channel version 24 hour programming Large, easy to follow LCD displays, give clear programme information Up to 3 ON/OFF periods per channel in each 24 hour operation Programmable Holiday setting can be set in advance of departure for any period of time. 1 or 2 hour boost and advance on each channel Mains powered with battery back up 3 Amp changeover contacts Are voltage free as standard Uses the same backplate as the 425 and 5 series programmers