If you are interested Evaluation of Domestic Heating Controls is a report of work done by Strathclyde University on the efficiency of various systems. It is purely theoretical, based on computer modelling of various types of houses, heating systems and controls.
If you are a real "anorak", you can even download the programs used and play around with them yourself.
If you are a real "anorak", you can even download the programs used and play around with them yourself.