Wondering what the difference is of our Noritz EZ Series models?
EZ98 or EZ111
Are the standalone tankless unit sold separately. This is just the heater itself and purchasing heater-only allows the plumber or contractor to install the heater based on whichever the installation scenario calls for.
EZTR40, EZTR50, EZTR75
The EZTR Series is a BUNDLED PACK. This means that the bundle comes with the heater and it also comes packaged with a venting kit. 
What do the model numbers mean?
EZTR stands stands for “Easy Tank Replacement”. The numbers after EZTR stand for the gallon tank that they are meant to replace. So for instance the EZTR40 would be a direct replacement for a 40 gallon tank the EZTR50 would be a replacement for a 50 gallon tank, etc.
What heater model comes bundled in each EZTR model pack?
EZTR40 – The NRC663 comes in this bundle along with venting accessories
EZTR50 – The EZ98 comes in this bundle along with venting accessories
EZTR75 – The EZ111 comes in this bundle along with venting accessories
More Information
For more information on the EZSeries you can visit www.ezseries.noritz.com
An Example Video of the EZTR BUNDLE KIT installation.