In this entry I'm going to discuss in more detail how I came to choose our heating and hot water system, and how it has performed to date.   As other forum members have found, deciding which fuel source and type of technology to use in a low energy house, is a challenge given the different requirements each of us has.  We had three stipulations – low running costs, hot water available on tap 24/7 and maintenance of the whole house at an even and constant temperature 24/7.   H