Thanks Mr T for your help
It will continue to run untill the D H W timer programme comes to the end of its auto x hours cycle it will then shut down,or manually switching off it stops in 30 secs of being switched off,unlike the c/h which cuts off after 30sec automatically (when the heat has reached pre set thermostat temperature setting) and shuts down and starts up as normal ,although it could have x hours left to run on the timer programme
Richard P
June 2008