house for work or school?
does anyone remains in the house during the day?
what time does the first person return home in the evening?
do you really need to heat the house at night while you are all asleep?
how long does it usually take for your home to reach a comfortable temperature?
do you have a different pattern at weekends?
then set the timer to be on at the times that are needed. it is a myth that it is more efficient to leave the heating on low all day. the most efficient is to use it only when it is needed. if your house takes a while to heat up then set the 