My install was just completed with 1000 feet of vertical loops, TT30, HWG, and Ecobee thermostat. I can see the temps in and out, both air and water. And I know about the air filter. But is there anything else to monitor, any tools or meters or diagnostic equip I should get to keep the system running? Id rather not just wait for a problem, if there is some way to prevent it.
Log your EWT/LWT and EAT/LAT. You should be able to get an idea of what to expect. In time this baseline understanding will let you catch problems early on.