Navien NPN-180U-LP Mid Efficiency Tankless Water Heater, 180,000 BTU, Indoor/Outdoor, Propane

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Navien NPN-180U-LP Mid Efficiency Tankless Water Heater, 180,000 BTU, Indoor/Outdoor, Propane

Name: Navien NPN-180U-LP Mid Efficiency Tankless Water Heater, 180,000 BTU, Indoor/Outdoor, Propane
Brand: Navien
SKU: NAVI-NPN-180U-LP
Price: 1085.70 USD
Availability: InStock

NavienSKU: NAVI-NPN-180U-LP

Price:

$1,085.70

Stock:

Only 8 units left

Quantity:

Ships UPS Ground for a flat $119 (continental US).
Flat rate by order weight: $119 under 70 lb · $149 for 70–100 lb · $189 for 100–150 lb.

Usually ships in 1–2 business days.

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Ships from Seattle, WA · 30-day returns · Manufacturer warranty

Shipping details

Shipping weight: 66.0 lb
Box size: 16 × 25 × 11.3 in

Heat Capacity (input) (Domestic hot water)	10,700 - 180,000 BTU/h
Efficiency ratings (Efficiency rating for NG & LP (UEF))	0.81
Flow rate (DHW) (35°F temp rise)	8.5 GPM
Flow rate (DHW) (45°F temp rise)	6.6 GPM
Flow rate (DHW) (67°F temp rise)	4.6 GPM
Minimum flow rate	0.5 GPM
Connection sizes (Cold water inlet)	3/4
Connection sizes (Hot water outlet size)	3/4
Connection sizes (Gas inlet)	3/4
Natural gas supply pressure (from source)	3.5 " WC to 10.5 " WC
Propane gas supply pressure (from source)	8 " WC to 13 " WC
Natural gas manifold pressure (min-max)	2.3 " WC to 0.53 " WC
Propane gas manifold pressure (min-max)	5.3 " WC to 1.3 " WC
Power supply (Main supply)	120V AC, 60 Hz
Power supply (Normal)	88 W
Power supply (Standby)	4 W
Power supply (Anti-frost)	114 W
Power supply (External pump)	< 150 W, 1.5 A W
Power supply (Fuse)	5.0 A
Dimensions	14.0" W x 23.0" H x 9.3" D
Boiler weight	60 lbs
Materials (Casing)	Cold rolled carbon steel
Materials (Heat exchangers)	Stainless steel
Safety Devices	Flame rod, APS, ignition operation detector, water temperature high limit switch, power surge fuse
AHRI number	204524353 (Natural gas) 204524354 (Propane)
CSA	Yes
NSF (Standard 5)	Yes
Low Lead (<0.25%)	Yes
DHW water pressure	15-150 PSI
Ultra low NOx	Yes

The Navien NPN-180U-LP is a mid-efficiency tankless water heater from Navien's NPN series. Mounts indoors or outdoors in a 14-inch-wide cabinet.

Rated input is 10,700 - 180,000 BTU/h on propane (LP). It modulates from 180,000 BTU/h all the way down to 10,700, so it is not running at full fire to fill a sink.

How much hot water you actually get

Navien rates every tankless unit by temperature rise, because the colder the incoming water, the less of it one burner can heat. Here is what the NPN-180U-LP delivers:

Temperature rise	Flow rate	Typical use
35°F	8.5 GPM	Warm-climate groundwater, or a preheated feed
45°F	6.6 GPM	The usual design point across most of the U.S.
67°F	4.6 GPM	Northern winter, incoming water near 40°F

Sized against a 2.5 GPM showerhead, the 67°F column is worth roughly one shower on the coldest day of the year, and more than that the rest of the year. Size to the 67°F row if your winter groundwater runs cold.

Minimum activation flow is 0.5 GPM, so it fires for a hand wash, not just a full shower.

Installing it

Cabinet: 14.0" W x 23.0" H x 9.3" D
Weight: 60 lbs
Water connections: 3/4" cold in, 3/4" hot out
Gas connection: 3/4"
Water pressure range: 15-150 PSI
Power: 120V AC, 60 Hz
Venting: per the Navien installation manual for this model — this is a non-condensing unit and does not vent in PVC
Heat exchanger: Stainless steel

Ratings and certifications

UEF: 0.81
CSA certified
NSF Standard 5
lead free (<0.25%)
ultra low NOx
AHRI: 204524353 (Natural gas) 204524354 (Propane)

Model details

Brand: Navien
Manufacturer part number: NPN-180U-LP
UPC: 884954227986

Ships in the manufacturer's carton. Shipping is calculated at checkout by weight, dimensions and destination. Gas connection and venting must be done by a licensed installer, to the Navien manual and to your local code.