Net aperture area - 7 square meters. Balance of system costs are not included because of the variability of system designs. More than one dish may be connected to one system. Additional pumps and storage tanks would not be needed in district heating systems and in high load applications. Annual performance will decrease if not all of the energy is consumed.
Solar steam is possible.
Be sure to use pressure relief valves. The mirrors will not exceed engineered high wind loads nor gravity snow loads. TV dishes are polar mounted. Annual performance can be predicted from solar data tables for various locations. The following link is a good source for calculating the solar resource for a mix of fixed and tracking solar collectors.