The figure means that the satellite giant is well on track to reaching its target of 25% penetration of Sky+ boxes in BSkyB homes by 2010.
Sky has also published new research highlighting how Sky+, which enables viewers to pause and rewind live TV and record programmes, has impacted TV viewing habits.
Research from the Sky View panel found that drama programming is most frequently recorded on the box, accounting for 39.3% of all time-shifted viewing. Other popular genres include documentaries (14.9%), entertainment (13%) and movies (9.5%) News and weather account for just 0.6% of time-shifted viewing while current affairs account for a mere 1.2%.
The research also found that in Sky+ households, time-shifting accounts for 22% of all viewing of programmes originally scheduled between 9pm and 10pm and 17% of all viewing of programmes scheduled between 10pm and 11pm.
This year, Sky will also introduce a number of new enhancements, including the ability to use the internet to set a recording on the Sky+ box and record programmes. Customers will be able to log on to http://www.sky.com/to programme the box remotely.
Also in 2007, the company will introduce access to a selection of the week's best programmes on demand.