AN UPDATE ABOUT COVID-19:Health and safety is at the heart of everything we do.Learn more
December 05, 2017

The Courtyard by Marriott

Casestudies marriot main.png

Project Details

The Courtyard by Marriott in Evansville, Indiana, uses seven Navien NPE-240’s to provide a steady supply of hot water for high and low demand.


The Courtyard by Marriott has to supply hot water on demand to 119 rooms as well as a laundry facility and a small restaurant. Demand varies greatly depending on the number of guests and restaurant traffic, so the hotel needed a system to provide the flexibility of handling peak loads and off times.


Design engineer Scott Reed from Evansville Winnelson, the Navien distributor, designed a hot water supply system with seven Navien NPE-240 water heaters and three unheated tanks to circulate water to and from the Navien heaters. Joe Cox from Altstadt Plumbing worked with Scott to plan and install the system. The entire installation took less than two weeks.


Efficiency for high and low demand: Joe explained how they configured the water heating system. “You’ve got to consider how many rooms there are based on the fixtures and the amount of occupancy you can have at one time and then basing that on gallons per minute, get the size of the equipment needed to handle that load. But you don’t want equipment running constantly when it’s not needed. That’s where Navien becomes a benefit because in times of low use they can run minimally or not run at all. Then in highest demand periods, all seven Naviens kick in.”

Scott added, “We used unheated storage tanks to supply plenty of water to the Navien heaters. At any one point in time there’s 119 gallons times three which is close to 360 gallons that can be drawn out for heating.”

Easier venting installation: “On this installation we used schedule 40 PVC solid core for intake and CPVC schedule 80 for exhaust,” Joe said.

Durability: Joe likes the long-term reliability of the NPE unit. “With the two stainless steel heat exchangers you don’t have to worry about scaling and corrosion so much. And basically the warranties are great.”



NPE Sizing Calculator
Navien Rebate Finder
Installer/Service Locator
Distributor/Sales Rep
Product Registration

Use our NPE sizing calculator

Download the Navisizer app

Navien Installer/Services Locator

Find the nearest Navien Service Specialist including installers and service providers.

Distributor & sales rep locator

Enter your state, city, or zip code to find a Navien Sales rep or distributor near you.

Product Registration

Online Product Registration

Navien uses the information from our web site to measure statistics such as: number of visits, pages visited, and information requested. 
Navien will never send unsolicited e-mail or share the e-mail or url address with other companies.

Customer Information

See Privacy Policy about collection and usage of your Personal Information.

Product Serial number is 15-16 digits and can be found either on the right side of the box or the back of the front cover.
Navien, Inc. Technical Customer Service Department

Training Information

Navien Academy
Go to Calendar

Navien Virtual Trainings
See Classes

Academy Experience
Watch video

In-Field Training
Find training near you