Water meter is ticking away. No sign of water or leaks, most plumbing visable. Have turned off all sink and toilet valves. Turrn off water main, ticking or water running stops. With main on, turn off valve at Sears Kenmore 45 Gal hot water heater, ticking or water flowing stops. Suspect hot water heater (float valve? the check or release valve seams to be working fine ,NOT Leaking) or maybe fitting on the "hot side" as suggested by a plumber. Hot water heater NOT leaking. Internal leak inside hot water heater? Help winter is comming. CBM

Water Heaters - Rheem