Compact & stylish, the Horstmann Centaur Stat is a single channel, 7 day time & temperature control suitable for combi-boiler applications & conventional systems. Battery power (via 3 standard AA type batteries) means no extra wiring when replacing a conventional room thermostat 8 Amp rated 0.5°C close switching differential, with boiler cycling kept to a minimum Temperature range adjustable between 5°C & 30°C Choice of simple 24 hour unit, or 7 day version Battery life minimum two years, with indicator warning when batteries need replacing Quick, easy & safe battery changing which will not affect the programme Features :-7 Day 2 wire connection Battery Powered