Recent content by colmar

Please ignore the above post. Job done - all working satisfactorily.

Hi Looking for confirmation really. I'm about to replace an ageing Hortsmann Diadem H425 programmer with a new H27XL model. According to the Horstman literature it's a direct replacement. I'm also going to add a Horstmann HRT-4B room thermostat - there is currently no room stat installed...