I found a page on boiler efficiency:
How a boiler works – boiler efficiency
It has a few tips, of which two seem contradictory (to me at least):
Quote:
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Another efficiency factor at this stage is the temperature you are running your system at. The hotter you run the boiler, the hotter it is trying to make the water that is to circulate around the house. Hotter water improves the response time of the system (the speed it can heat the radiators up at), but reduces the efficiency of the system.
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Quote:
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Running your boiler for less time is a good thing. If you don’t have a timer on your boiler, get one. They are very convenient, and they allow you to run your boiler for short periods when you need the heat.
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The only way to satisfy both of these is to superinsulate your house and replace all radiators with hydronic floors. That way you can have
both lower system temperature
and shorter running time.