I'm not actually convinced that the floor would even feel warm to the feet for much of the day (particularly in the evenings) if it were only heated by E7 during the night. UFH is not really an effective way of heating a room at the best of times, but expecting its effects to still be noticeable, say, 15 hours after it was last heated seems to me to be exceedingly wishful thinking.
Fair point, I had disregarded the Eco7 on the equation for that exact reason. Was assuming it would be run morning and evening as per normal UFH.
If, which I very much doubt, it were possible to have enough UFH to effectively heat a room (without the floor becoming too hot to stand on), rather than the 'usual' aim of just making the floor warm, the cost of running it on daytime E7 electricity (which is even more expensive than 'standard rate' electricity) would, I imagine, be unpleasantly high.
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