Agreed, Richard - it sounds to me more like a device to encourage people to heat their houses when they're not there 'so it's warm when we get in'. That won't save any energy, unless they're in the habit (and people continue to amaze me with some of these things, so it's possible) of just leaving the heating on whether they're in or not.
How long does it take to warm up a house from a cold start anyway? Ours is biggish but well insulated and it's pleasantly warm within 15 minutes of starting the system.
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