Remove old boiler from basement. Install new navien tankless boiler in same location as old unit. Connected gas, heat loop, condensate, fresh air intake, and exhaust and connected all wiring. Bled all air from system and called navien to register unit and go over parameters. Turned system on and everything is in working order at this time. $500 left to collect on Monday once rebate paperwork (if there is any) is discussed with customer.