An installer is planning a multi-zone floor heating system supplied from a single stage non-modulating geothermal heat pump. The radiant floor panels will be low thermal mass. The system also includes domestic water heating. The system is shown in figure 1. Assume that the amount of buried tubing in the earth loop tubing is sufficient for the heat pump. Can you identify at least four design flaws or operational issues that are likely to develop if the system is installed as shown?
