Navien NPE 240 S2 NaviCirc valve

[Freedomeagle]

I have the above Navien and want to install the NaviCirc recirculation valve. Two questions. First, I understand I will need an external recirculation pump. What is the recommended recirculation pump for this model of Navien? Second, its in a new, single level home. It is approximately 100 ft from one end to the other. On one end is a seldon used guest room, the master bath is on the other. The water heat sits about 30' from the guest room end and the kitchen and laundry are about 1/2 between. Can/should I use two valves, one at the guest room and and one at the MB end; or can I only use one valve. Thanks in advance for your help with this.

 

[Fitter30]

Use one valve. Guest bath will get hot faster if turned to full hot. Bathroom sink faucets 1.8 gpm. Navian doesn't list a pressure drop for their valvejust a pump requirement for optional pump.
30' of 3/4" m copper .81 gallon
100' 2.69 gallons
Most houses use M copper
www.hotwaterproducts.com/calculators/pipe-volume-calculator-copper

 

[Sponsor]

 

[Dradam]

I have the NPE24A with built in recirc. I asked my installer about two recirc valve during my install. He said can be done, but only if you need hot water faster in that additional area.

 

[John Gayewski]

Navien says you can use two.