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Well took the plunge and changed the wires.... put on boost for an hour and had enough hot water for shower and 2 lots of washing up! Can't believe it was wired up wrong :shock: Next question.. how long would you think it takes to heat up the tank - don't want to have it set for longer than...

Just read this post and think it might help me!! I've also got a DD170 where get enough hot water for 2 showers max and the boost setting never seems to work! I've just checked the wiring and found that the bottom cable goes to the boost setting of the Horstmann Economy 7 Quartz and the top...