How long does it take to install a Navien Tankless Water Heater NR-240A?
How many hours does it take to install a Navien NR-240A?
To install my unit took 4 hours and 19 minutes - from the time they knocked on the door to the time the door closed as they left. There were 2 people - one was the gas guy and the other was a general labourer. The gas guy worked inside unpacking the unit and attaching the flex line, etc. while the other guy drilled the holes through the wall for in the input and discharge.
All told, they could have saved about an hour if they'd had a better drill for going through the brick, and some of their other equipment (e.g. drainage hose for the existing hot water tank) more accessible.