Pacific Blue Mechanical » Navien NHW-180SU Premium Non-Condensing Tankless Water Heater
The Navien NHW-180SU Premium Non-Condensing Tankless Water Heater is a compact and high-efficiency outdoor water heating solution designed for reliable on-demand hot water production in residential applications. Built with NaviTech stainless steel heat exchanger and burner technology, it delivers durability, stable performance, and long service life.
Its space-saving exterior design makes it ideal for retrofit projects where indoor installation space is limited. By moving the system outdoors, it eliminates the need for interior venting while still maintaining strong heating performance and energy-efficient operation.
The Navien NHW-180SU Premium Non-Condensing Tankless Water Heater provides consistent hot water delivery while optimizing installation flexibility. Its outdoor configuration is especially beneficial for homes with limited mechanical room space or retrofit upgrades.
The stainless steel heat exchanger ensures long-term reliability and resistance to wear, even under frequent usage. Cascading capability allows multiple units to be connected together to support larger homes or higher simultaneous hot water demand.
With low NOx emissions, the system also supports cleaner operation and improved environmental performance.
| Item | NHW-180SU |
| Gas Input (Domestic Hot Water) | 10,700 - 180,000 BTU/h (3.14 - 52.74 kWh) |
| UEF (NG & LP) | 0.81 |
| Flow Rate - 35°F Temp Rise | 8.5 GPM (32.2 l/m) |
| Flow Rate - 45°F Temp Rise | 6.6 GPM (25 l/m) |
| Flow Rate - 67°F Temp Rise | 4.8 GPM (18.2 l/m) |
| Dimensions | 14.0" W x 23.0" H x 9.3" D (35.6cm x 58.4cm x 23.6cm) |
| Boiler Weight | 65 lbs (29.5 kg) |
| Installation Location | Indoor or outdoor wall-hung (vent cap kit required for outdoor) |
| Venting Type | Forced draft direct vent (indoor only) |
| Ignition | Electronic ignition |
| DHW Water Pressure | 15-150 PSI (1.05-10.55 kg/cm²) |
| Natural Gas Supply Pressure | 3.5 " WC to 10.5 " WC (0.87 kPa to 2.61 kPa) |
| Propane Gas Supply Pressure | 8 " WC to 13 " WC (1.99 kPa to 3.23 kPa) |
| Natural Gas Manifold Pressure (min-max) | 2.3 " WC to 0.7 " WC (0.57 kPa to 0.17 kPa) |
| Propane Gas Manifold Pressure (min-max) | 4.5 " WC to 1.3 " WC (1.1 kPa to 0.32 kPa) |
| Minimum Flow Rate | 0.3 GPM (1 l/m) |
| Cold Water Inlet | 3/4 |
| Hot Water Outlet | 3/4 |
| Gas Inlet | 3/4 |
| Power Supply | 120V AC, 60 Hz |
| Normal Power Consumption | 100 W |
| Standby Power Consumption | 4 W |
| Anti-Frost Power Consumption | 114 W |
| External Pump | < 150 W, 1.5 A W |
| Fuse | 5.0 A |
| Casing Material | Cold rolled carbon steel |
| Heat Exchangers | Stainless steel |
| Safety Devices | Flame Rod, APS, Vent Installation Detector, Ignition Operation Detector, Water Temperature High Limit Switch, Power Surge Fuse |
Navien reserves the right to change specifications at any time without prior notice.
| Product | Warranty Type | Labor | Parts | Heat Exchanger |
| Residential* | Standard1 or Controlled Recirculation2 | 1 Year | 5 Years | 15 Years |
| Residential* | Uncontrolled Recirculation3 | 1 Year | 3 Years | 5 Years |
| Commercial or Combi4 | Standard1 or Controlled Recirculation2 | 1 Year | 5 Years | 5 Years |
| Commercial or Combi4 | Standard or Controlled Recirculation3 | 1 Year | 3 Years | 3 Years |
* Applies only to single family, residential locations.
1 Standard means there is no recirculation being used.
2 Controlled Recirculation means recirculation of the water through the water heater is controlled by either the water heater or an external aquastat.
3 Uncontrolled Recirculation: External pumps configured to circulate continuously through the water heater are subject to the uncontrolled recirculation warranty terms. An aquastat is the minimum pump control requirement for DHW or storage tank recirculation in order to maintain the full controlled recirculation warranty.
4 Combi refers to a combination potable water and space heating application. Water heaters cannot be used in space-heating-only applications or this warranty will be voided.
Pacific Blue Mechanical provides complete supply, installation, repair, and maintenance services for the Navien NHW-180SU Premium Non-Condensing Tankless Water Heater across Metro Vancouver. Whether you are upgrading an existing outdoor water heating system or planning a new installation, our licensed technicians deliver end-to-end service designed for long-term reliability and performance.
If requested, we can source and supply the NHW-180SU directly and manage the entire installation process from start to finish. This includes gas line connection (NG or LP), outdoor wall mounting, water line integration, system commissioning, safety testing, and full performance optimization to ensure safe and efficient operation.
Already have a Navien NHW-180SU installed? We also provide professional repair and maintenance services including diagnostics, troubleshooting, flushing, descaling, burner servicing, leak detection, component replacement, and preventative maintenance to keep your system operating efficiently year-round.
If your unit is experiencing issues such as inconsistent hot water, ignition problems, reduced flow, error codes, or performance drops, our experienced technicians can quickly diagnose the issue and provide the most cost-effective repair solution.
From full system supply and installation to emergency repairs and routine maintenance, Pacific Blue Mechanical delivers trusted workmanship and reliable hot water solutions for homeowners throughout Metro Vancouver.
The Navien NHW-180SU Premium Non-Condensing Tankless Water Heater is a premium outdoor non-condensing tankless water heater.
Yes. The NHW-180SU is designed specifically for exterior wall-mounted installation.
Yes. It is available for both Natural Gas and Propane applications.
Yes. The system is cascading capable, allowing multiple units to be connected.
Yes. It operates with low NOx emissions rated at 20ppm.
