Cannot see a model number, but from a quick google, these are programmable stats. Is it controlling a combi? simpler versiosn exist - the Honeywells are simple I think. For even simpler, replace it with a timer, and a separate stat, use a dial type timer, and an analog stat, so need digital buton to press etc.If a combi, you need a single channel programmer, and any suitable stat. More info needed to give a more precise answer.