Navien NPE-240A2 ComfortFlow® High Efficiency Condensing Tankless Water Heater, 199,900 BTU, Indoor/Outdoor, NG/LP Convertible Technology NPE-240A2

Navien NPE-240A2 ComfortFlow® High Efficiency Condensing Tankless Water Heater, 199,900 BTU, Indoor/Outdoor, NG/LP Convertible

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Navien NPE-240A2 ComfortFlow® High Efficiency Condensing Tankless Water Heater, 199,900 BTU, Indoor/Outdoor, NG/LP Convertible

Name: Navien NPE-240A2 ComfortFlow® High Efficiency Condensing Tankless Water Heater, 199,900 BTU, Indoor/Outdoor, NG/LP Convertible
Brand: Navien
SKU: NAVI-NPE-240A2
Price: 2910.00 USD
Availability: InStock

NavienSKU: NAVI-NPE-240A2

Price:

$2,910.00

Stock:

In stock (182 units), ready to be shipped

Quantity:

Ships UPS Ground for a flat $149 (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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Questions? Call (404) 678-9908 or chat with us.

Complete the install

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

Shipping details

Shipping weight: 84.7 lb
Box size: 19.3 × 29.4 × 15.2 in

Heat Capacity (input) (Natural gas)	13,300 - 199,900 BTU/h
Heat Capacity (input) (Propane)	13,300 - 199,900 BTU/h
Efficiency ratings (UEF (NG & LP))	0.95
Flow rate (DHW) (35°F temp rise)	11.2 GPM
Flow rate (DHW) (45°F temp rise)	8.7 GPM
Flow rate (DHW) (67°F temp rise)	5.6 GPM
Minimum flow rate	0.5 GPM, < 0.01 GPM option*
Connection sizes (Cold water inlet)	3/4"
Connection sizes (Hot water outlet size)	3/4"
Connection sizes (Gas inlet)	3/4"
Water pressure	15-150 PSI
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)	-0.03 " WC to -0.96 " WC
Propane gas manifold pressure (min-max)	-0.02 " WC to -0.96 " WC
Power supply (Main supply)	120V AC, 60 Hz
Power supply (Maximum power consumption)	200 W (max 2 A), 350 W (max 4 A) with external pump connected
Venting (Exhaust)	2" or 3" PVC, CPVC, approved polypropylene and stainless steel 2" or 3" special gas vent type BH (Class II, A /B/C)
Venting (Intake)	2" or 3" PVC, CPVC, approved polypropylene and stainless steel 2" or 3" special gas vent type BH (Class II, A /B/C)
Venting (Vent clearances)	0" to combustibles
High elevations	10,100 feet for both NG or LP gas. Please refer to Installation Manual for additional details and instructions.
Dimensions	17.3" W x 27.4" H x 13.2" D
Boiler weight	77 lbs
Materials (Casing)	Cold rolled carbon steel
Materials (Heat exchangers)	Primary heat exchanger: stainless steel Secondary heat exchanger: stainless steel
Safety Devices	Flame rod, APS, ignition operation detector, water temperature high limit switch, exhaust temperature high limit sensor, power surge fuse, burner high limit fuse, vent installation detector (VID)
AHRI number	206368359
Energy star certified	Yes
CSA	Yes
NSF (Standard 5)	Yes
Low Lead (<0.25%)	Yes
SCAQMD 1146.2 (NOx, <20ppm)	Yes

The Navien NPE-240A2 is a condensing tankless water heater from Navien's NPE-2 series, with the ComfortFlow® recirculation pump and buffer tank built into the cabinet. No external pump, no dedicated return line hardware to buy separately.

Rated input is 13,300 - 199,900 BTU/h on natural gas or propane — the unit is certified for both. It modulates from 199,900 BTU/h all the way down to 13,300, 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 NPE-240A2 delivers:

Temperature rise	Flow rate	Typical use
35°F	11.2 GPM	Warm-climate groundwater, or a preheated feed
45°F	8.7 GPM	The usual design point across most of the U.S.
67°F	5.6 GPM	Northern winter, incoming water near 40°F

Sized against a 2.5 GPM showerhead, the 67°F column is worth roughly 2 showers at once 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.

With a Navien recirculation setup this unit also supports the low-flow activation option, down to under 0.01 GPM.

About ComfortFlow®: the pump and the buffer tank are inside the unit, not bolted on. That is what kills the cold-water sandwich when someone turns the shower off and back on, and it lets you run recirculation on a dedicated return line or on a crossover valve at the far fixture.

Installing it

Cabinet: 17.3" W x 27.4" H x 13.2" D
Weight: 77 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: 2" or 3" PVC, CPVC, polypropylene or stainless steel, intake and exhaust
Vent clearance: 0" to combustibles
Altitude: approved to 10,100 feet for both NG or LP gas. See the installation manual for the details.
Heat exchanger: dual stainless steel, primary and secondary

Ratings and certifications

UEF: 0.95
ENERGY STAR® certified
CSA certified
NSF Standard 5
lead free (<0.25%)
SCAQMD 1146.2 low-NOx (under 20 ppm), the rule that governs Southern California
AHRI: 206368359

Model details

Brand: Navien
Manufacturer part number: NPE-240A2
UPC: 884954920870

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