Hi FTT,Not much to go on here but some? may help;
Is this an oldish system, in which case hot water to tank may be gravity fed so not pumped & only control is blr on / off.
Are there any other controls ie motorised Valves, tank thermostats etc . have a good look @ what you have got first.
presume of course this not a Combi system with hot water on demand?
Hi Fred ,
look on side of lower tank for wires to a small rectangular thermostat, I believe what u have is a 'Fortic' cylinder which has an inbuilt upper head tank, if gravity fed system there will be only a couple of quite large pipes going in to lower tank, 1 near top & other near bottom.
if several small pipes with valves with flex attached then could be fully pumped system, in which case you may be able to alter programmer but I think you have pump on timer for heating only because gravity system, if still unsure ask local plumber to advise best course of action.
BTW how do you get hot water at the moment? Electric immersion heater?
BTU regards SPARX