The different models of Navien tankless heaters and what they do.

I get a lot of questions about the different model and sizes of Navien tankless heaters and which one they should install. So here we go.
Navien makes three different tankless heaters for domestic hot water. They make other models for heating only and their combi-boiler that does heating and domestic hot water.
Here are the models and sizes,
NPE-A2 this is the one with circulation completability weather you have a dedicated circulation line, or you are going to use a Navi-Circ.
180 A2
210-A2
240-A2
They have the same model without the pump and that will be the S2
Both the A2 and the S2 come to the USA as natural gas and has a propane conversion kit inside the left-hand side of the unit (see my past video on the conversion) This unit can also be used inside with 2
' PVE venting and fresh air intake or can be installed outside with their vent hood. So, this one unit is 4 unites in one inside, outside, natural gas and propane. It also comes with a high-altitude conversion kit if you are installing it over 2000 feet.

NPN model is there noncondensing version, this model needs to be bought either natural gas or propane. It comes as an outside unit or there (U) universal model that can be installed inside with concentric venting or outside with their vent hood.
NPN 160E
NPN180E
NPN199E
NPN 160U
NPN180U
NPN199U
Just remember you need to order this model either natural gas or propane.

NHW model is there noncondensing unit with circulation capability so it a cross between the NPE and the NPN unit this unit also comes either inside or outside model. the outside model can be installed with there vent hood.
NHW-AI 160
NHW-AI 180
NHW-AI 199
The AI is their interior model.
NHW-AE is their exterior unit,
and it comes as,
160
180
199
Remember with this model you need to order it natural gas or propane.
This is a rundown of the models and in the video, I give the sizing info.

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I hope you enjoy the video,
Mike

PLEASE USE A LICENSED PLUMBER TRAINED IN LEVEL THREE TRAINING.PLEASE FOLLOW ALL LOCAL AND NATIONAL GAS AND PLUMBING CODES AND TO FILE A PERMIT AND OBTAIN AN INSPECTION WITH YOUR LOCAL BUILDING DEPARTMENT.