We installed a new System 2000 oil boiler, installed new manifolds, and flue pipe. Reconnected the existing indirect water heater to improve reliability, efficiency, and safe operation. Purged all zones clear of air to ensure proper heat flow. Checked boiler safeties. Tested system for proper operation. Had a problem with zone 2 and floor thermostat not holding a call so replaced it with new. Will need to return to give customer a total walkthrough.