Navien NPE-240A x2 Manifold Parts/Advice

[schalliol]

I’m thinking of replacing my 75G water heater that’s at the end of its useful life with a pair of NPE-240As. The home has a lot of bathrooms and I want to be sure we can have up to 5 at once. I will have a plumber install the units, but I’m interested in getting all the parts figured out and see if you experts can help me confirm the ideal design so they can just install. It sounds like Navien offers a set of parts for this purpose, but I have difficulty finding the parts beyond the NPEs so I can buy them cost effectively.

- I’m looking for a Ready-Link system on a rack back-to-back
- The house does not have a recirculating line, but we’d like to use the cold Circ option in these units

Can anyone point me in the right direction? Thanks!

 

[Fitter30]

Don't thInk there going to do what u want page 8 of this manual. Look at temperature rise. With any condensing heater need to know two things lowest incoming water temp and max gpm. Also a hot water mix calculator just touch each box to change to gpm and f
Gas line looks to be 3/4" black pipe about 1 1/8" diameter. Larger gas line has to run. Heaters could hang from a unistrut frame can purchase the parts from a box store electrical dept. Power from existing wh from a 15 amp breaker could be used for both. Then the flues and combustion air. Need to look at you tube for yearly maintenance on these heaters and yes i saw the softener.

Specifications - Navien NPE-180A2 Installation Manual [Page 8]

Navien NPE-180A2 Manual Online: Specifications. The following table lists the specifications for the water heater. Additional specifications about water, gas, electric, and air supplies (venting) appear in the Installation section. Item Heat Natural Gas, Capacity Propane Gas (Input)...

www.manualslib.com

Water Mixing Calculator | Spirax Sarco

This calculator will help to consider the mixed temperature of two water streams, its flowrate, percentage flow and actual flow of each stream.

www.spiraxsarco.com

 

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[Breplum]

The accessories page from Navien has the part number.
You could easily build anything out of wood as well.
The Ready-Link Manifold System is what you may want, though a plumber can duplicate readily.

Navien Parts & Accessories | Navien | Navien

Find Navien accessories and parts kits for venting & termination, plumbing, Wi-Fi control & field service for tankless water heaters, boilers & combi-boilers.

www.navieninc.com

you will also need the common vent collar kit,
the ready-link comm cable
Any Navien distributor will be able to order and you won't likely ANY discounting.
With so many bathrooms, you won't get very good/hardly results using any 'bridge' recirc. NavCirc or other...
You are talking some big bucks. In my opinion you will have fine results with one NPE240A2 and one 240S2 units cascading with ReadyLink. But, talk to Navien customer service to be sure given how many GPM you ideally want to run.
Lack of dedicated hot water line will not be solved, unfortunately.

 

[GReynolds929]

Online parts availability will be difficult as navien only sell through authorized dealers. If you do find them make sure it's a authorized dealer or warranty is void. A 240A2 with a 240S2 on a back to back kit gets you 7.9 gpm at 100° rise. Depending on your ground water temp you may need a third if you want to run all baths at the same time.

 

[schalliol]

Thank you, everyone! I will talk with Navien!

 

[Master Plumber Mark]

Presently you have a Bradford white 75 gallon power vented
unit sitting on the floor of the basement with no pan underneath it and no
thermal expansion tank on the unit......
I am wondering if this is giving you any issues right now and is it keeping up
with your water heating needs.... ??

Some people get a throbbing desire to
switch to tankless because they think that they are going green and are saving the
environment or they just think its a fashionable thing to do... just like when we were kids
and you had to have mag wheels on your car or an ass kicking stereo system

I have no interest in doing tankless heaters because of the future issues that can arise with them
down the road....... We install Rheem 75 gallon power vented heaters with a 12 year tank warranty for
just under 4k and I am just curious as to what 2 of those puppies are gonna set you back...



I see that you are in Carmel Indiana . Their are a lot of plumbers in our town that are literally
sky high on everything they do and it really depends on who you call..
I am just morbidly curious as to what this is costing??

.... you can PM me if you wish

Thank you

 

[schalliol]

Hi Mark, it's working fine to supply water as of now. It looks like the difference is fairly considerable (~$3K) to go with tankless. It looks like we can get $600 tax credit (maybe 2x for two units, posting a question on that) plus the savings of less hot water wasted. If $1,200 in tax credits it's probably a money saver net but if it's $600, it's going to definitely cost more.

 

[Master Plumber Mark]

The hot water that gets wasted with a tank type heater is negligible..
more water gets wasted with tankless heaters due to the lag time before you
get hot water....

UL labs did a study on this a long time ago
and they claim the energy savings for a tankless heater vs a tank type unit works out to be about
10 bucks a month.... and it takes a very long time to reach even or payback because you end up
putting the small savings back into service to de-lime the unit...every year...


the average cost for a Rheem 75 power vent is 3500 with an 8 year tank warranty and a 12 year unit
runs 3900.... I really dont know off hand if their are any tax credits with a power vented heater at this time
I am looking into that for fun ..

if your unit is working fine I would just leave well enough alone and look
for other things to worry about and let it do its job....

If you really need to fuss about it then maybe throw a couple of water heater blankets on the unit to save energy, the blankets will save you about 25% on your yearly heating bill

I just did a 75 gallon Rheem power vent down in greenwood today for 3500... (cheap)

Shared album from Mark

Tap to view!

photos.app.goo.gl

I honestly do want to hear what the total cost for 2 tankless units would cost you from the
local north side plumbers.... I can PM you and give you the name of the highest in town and the lowest
I know of if you are interested in seeing the range.. With A few of them it feels like highway robbery

Thank you