Is your domestic hot water (from the faucets) on a seperate system from the heating hot water system? I hope so.

A hydrionic system has a water heater (gas or electric burner), a storage tank, a circulating pump or two, and the piping to/from the radiant units and the units themselves. My experience is NOT state of the art with these systems. I last fooled with one in the house I grew up in in 73. Give me some more details and I'll noodle it some more. Look for a speerate breaker panel if the system water heating unit is far from the main panel. Check all the 110 and 220 breakers. Look for a reset on the pump and heating unit. Hope it's warmer there than here....