This zone pump controller works great with the navien boiler. One thing to note is that this doesnt come with the navi link cable (which it should in my opinion). They do that because this unit can be used interchangeably with other boilers, but still, for the money spent on this item, a cord should not make or break navien's bank.
Advantages: Works great for a navien boiler. Can be used to control a generic boiler with a boiler pump if needed.
Disadvantages: Doesnt come with the communication cable