On low temperature networks: Currently the modelling approaches employed focus on the steady-state thermal and hydraulic behavior of these highly complex systems. These give reasonable simulations of the energy flows, temperatures and pumping energy requirements necessary to size key components. There are still improvements to be made regarding the coupling of building-level models with system models and the use of improved detailed models of components (pumps, heat pumps and borehole fields), as well as a shift to fully dynamic models. There is much to be done to realise the full benefit of these systems, which could be aided by better models of the complex interactions involved and of the control systems that govern them \cite{Allegrini_2015}.