Unless you plan to live by candle light and bathe in the canal you are going to need electrics and hot water. The two main players when it comes to boat electrics are Victron and Mastervolt, I went for victron as their whole eco-system seems a lot more advanced and customisable (are a lot more guides, examples and advise readily available online). In terms of hot water and heating a calorifier is the only real sensible option, for the diesel heater I chose Webasto over Eberspacher as I liked how they how they have incorporated the use of Heatmiser thermostat controllers.