Navien · NPN-E Non-Condensing Tankless Water Heaters (DHW)
Navien NPN-180E
The Navien NPN-180E is a non-condensing tankless water heater — a DHW-only appliance, not a boiler — firing 10,700 to 180,000 BTU/h at 0.81 UEF with up to 8.5 GPM at a 35°F rise.
Key figures
- Max input
- 180 MBH
- Max CSA output
- —
- AFUE
- —
- Min input
- 10.7 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Navien NPN-180E in practice
The NPN-180E is a non-condensing tankless water heater in Navien's NPN-E line. the NPN Specification Sheet prints an input range of 10,700 to 180,000 BTU/h and a Uniform Energy Factor of 0.81; the official product page publishes up to 8.5 GPM at a 35°F (19.4°C) temperature rise. It heats domestic hot water on demand and has no hydronic heating circuit.
The unit weighs 60 lb in a 14 W × 23 H × 9.3 D in cabinet, connects on 3/4" NPT water and gas lines, and is installed outdoor wall-hung (exterior). Recirculation control built into the circuit board. As a non-condensing appliance it is designed to avoid flue-gas condensation; venting and clearances follow the installation manual.
The NPN product pages live on navieninc.com; the launch press release was also published on navieninc.ca, but no Canadian availability statement was found on the product pages, so Canadian availability is recorded as unknown. For homes that need space heating as well as hot water, Navien's combi boilers (NCB-H, NFC-H) are the boiler products; a tankless water heater such as the NPN-180E covers domestic hot water only and is sized on peak hot-water demand, not on a building heat-loss calculation.
Best suited to
- Domestic hot water at up to 180,000 BTU/h input
- 0.81 UEF non-condensing operation with 8.5 GPM maximum flow at a 35°F rise
- Installations calling for a DHW-only appliance (outdoor wall-hung (exterior))
Applicability and support
- Model number
- NPN-180E
- Canadian availability
- unknown
- Production status
- current
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Not verified
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Specifications
Published specifications
Values as published by Navien. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input, minimum | 10.7 MBH | 10,700 BTU/h, per the NPN Specification Sheet. |
| Input, maximum | 180 MBH | 180,000 BTU/h, per the NPN Specification Sheet. |
| Efficiency | ||
| Uniform Energy Factor (UEF) | 0.81 UEF | 0.81 UEF (NG and LP) per the NPN Specification Sheet; UEF is a dimensionless efficiency factor, not an AFUE percentage. |
| Domestic hot water | ||
| Maximum flow rate at 35°F (19.4°C) rise | 8.5 GPM | As printed on the official product page's temperature-rise table. |
| Water connections | 3/4" NPT | Hot and cold water connections per the official specification sheet. |
| Physical and connections | ||
| Weight | 60 lb | As printed on the official product page. |
| Width | 14 in | |
| Height | 23 in | |
| Depth | 9.3 in | |
| Gas connection | 3/4" NPT | |
| Operating limits and other | ||
| Technology | non-condensing tankless water heater | Recorded as a DHW appliance: this model is not a boiler and has no space-heating circuit. |
| Recirculation | Recirculation control built into the circuit board | |
| Fuel | Natural gas or propane | All NPE-2 models are field convertible from NG to LP per the product pages; conversion is licensed gas work. |
| Installation | Outdoor wall-hung (exterior) | |
| Approvals | CSA; NSF/ANSI 5; SCAQMD 1146.2 (NOx < 20 ppm); AHRI listed per model | As printed on the official product pages. |
Manuals
Alerts documented for this model
None documented yet.
Frequently asked questions
Is the Navien NPN-180E a boiler?
No. The NPN-180E is a non-condensing tankless water heater (DHW-only). It has no space-heating circuit; Navien's combi boilers are the NCB-H and NFC-H series.
What is the input range of the NPN-180E?
the NPN Specification Sheet prints 10,700 to 180,000 BTU/h, 0.81 UEF and up to 8.5 GPM at a 35°F temperature rise.
Where is the NPN-180E available?
The NPN line's official product pages are on navieninc.com; Navien also published the NPN launch press release on navieninc.ca, but Boilers.ca found no Canadian availability statement on the product pages, so Canadian availability is recorded as unknown.
Questions about the Navien NPN-180E?
Describe what the boiler is doing and get a straight answer about the next step.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
- Navien — NPN-E series · accessed September 9, 2026
- Navien — NPN-180E product page · accessed September 9, 2026
- NPN Specification Sheet (EN) · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.