The success of the technology concerning shallow geothermal installations creates a great density where systems will increasingly affect each other negatively. Especially in an urban context, this becomes an inextricable tangle. On top of that, different types of systems are active, both smaller closed and larger open systems are applied according to project size and specific needs. Based on a concrete example case, it is shown that it makes sense to go for a collective approach, in combination with a 5th GDHC. The impact is investigated by subsurface modelling and additional economic analysis. The hydrogeological modelling is performed using FeFlow 10.0, a 3D finite-element software. Both open loop systems (ATES, Aquifer Thermal Energy Storage) and closed loop systems (BTES, Borehole Thermal Energy Storage) are modelled. The thermal and hydraulic impact of the different systems on each other and the environment is investigated. The results show that when shallow geothermal systems are operating close to each other, there is a risk of mutual impact. Open loop systems can have both thermal and hydraulic impact on nearby systems, while closed loop systems can only thermally impact their surroundings significantly. Moreover, the economic analysis shows that the project is more cost-efficient by using a combined geothermal system. The use of a fifth-generation network with uninsulated pipes optimally contributes to favourable economics.