An installer is asked to provide 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 needs to provide domestic water heating. The system he designs is shown above.
Assume that the amount of earth loop tubing is sufficient for the capacity of the heat pump. Can you identify at least four design deficiencies or operation issues that are likely to develop if the system is installed as shown?