I second what Cowboy says. 15-20 years ago geothermal was all the rage in the north bay area. I installed it on several new high schools, wineries, huge custom homes and large government facilities.
Due to the new push for everything to be electric, geo is now obsolete being replaced by VRF (Variable Refrigerant Flow) heat pumps and split systems. I haven't bid a new boiler/tower/heat pump job or geothermal project in years.
The newest system which seems to be the wave of the future here in Commiefornia is the Heat Pump water heater/HVAC system. This system incorporates the HVAC equipment into the domestic plumbing system to utilize the heat or cooling created during the refrigeration change of state to accomplish both HVAC heating/cooling/radiant and the heating of domestic hot water with the same equipment.
This of course of an all electric system, so if you are off grid or plan to use natural gas or propane like the good ol' days it probably isn't a great option. It also lacks redundency, so if one of the major components goes down, everything goes down. But, if your circ pump craps out on your geo loop, guess what, so does your entire system.
Lots of options out there to consider. Where do you live?