Pacific Blue Mechanical » Navien NHW-199AI Premium Non-Condensing Tankless Water Heater
The Navien NHW-199AI Premium Non-Condensing Tankless Water Heater is a high-performance indoor tankless water heating solution engineered for reliable residential hot water delivery. Designed with premium components and advanced recirculation technology, this unit provides fast hot water response, improved efficiency, and dependable long-term operation.
Featuring a built-in recirculation pump and integrated buffer tank, the NHW-199AI helps reduce hot water wait times while minimizing temperature fluctuations during operation. Its NaviTech stainless steel heat exchanger and burner are designed for durability, corrosion resistance, and efficient heat transfer.
The Navien NHW-199AI Premium Non-Condensing Tankless Water Heater is designed to deliver consistent hot water performance while improving user comfort and system efficiency. Its integrated recirculation pump and buffer tank help provide quicker hot water delivery throughout the home while reducing cold water waste.
The durable stainless steel heat exchanger and burner improve long-term reliability and heat transfer performance, while cascading capability allows multiple units to work together for higher-demand residential or light commercial applications.
Its compact indoor wall-mounted design also helps save valuable installation space compared to traditional storage tank systems.
| Item | NHW-199AI |
| Gas Input (Domestic Hot Water) | 10,700 - 199,900 BTU/h (3.14 - 58.57 kWh) |
| UEF (NG & LP) | 0.81 |
| Flow Rate - 35°F Temp Rise | 9.5 GPM (36 l/m) |
| Flow Rate - 45°F Temp Rise | 7.4 GPM (28 l/m) |
| Flow Rate - 67°F Temp Rise | 5 GPM (18.9 l/m) |
| Dimensions | 17.3" W x 26.5" H x 10.3" D (43.9cm W x 67.3cm H x 26.2cm D) |
| Boiler Weight | 65 lbs (29.5 kg) |
| Installation Location | Indoor wall-hung |
| 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) | 2.8 " WC to 0.7 " WC (0.7 kPa to 0.17 kPa) |
| Propane Gas Manifold Pressure (min-max) | 5.4 " WC to 1.3 " WC (1.3 kPa to 0.32 kPa) |
| Minimum Flow Rate | 0.4 GPM (1.5 l/m), < 0.01 GPM (0.04 l/m) option* |
| Cold Water Inlet | 3/4" NPT |
| Hot Water Outlet | 3/4" NPT |
| Gas Inlet | 3/4" NPT |
| Power Supply | 120V AC, 60 Hz |
| Normal Power Consumption | 115 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, VID (vent installation detector), ignition operation detector, water temperature high limit switch, power surge fuse |
* Available for NHW-A Models configured in an optional ComfortFlow® recirculation mode.
Energy consumption will increase when the system is configured for recirculation.
Navien reserves the right to change specifications at any time without prior notice.
| Product | Configuration | 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-199AI Premium Non-Condensing Tankless Water Heater throughout Metro Vancouver. Whether you are upgrading from a traditional storage tank water heater or installing a new high-performance tankless system, our licensed technicians deliver professional solutions tailored to your home’s hot water needs.
If requested, we can directly source and supply the NHW-199AI for your project and professionally handle the entire installation process from start to finish. This includes gas line installation, venting configuration, recirculation system setup, water line connections, commissioning, and performance optimization to ensure safe and reliable operation.
Already have a Navien NHW-199AI installed? We also provide ongoing maintenance and repair services including diagnostics, troubleshooting, flushing, descaling, burner servicing, component replacement, and preventative maintenance to help maximize efficiency and extend system lifespan.
If your tankless water heater is experiencing inconsistent hot water, ignition problems, error codes, pressure fluctuations, leaks, or reduced performance, our experienced technicians can quickly diagnose the issue and recommend the most cost-effective repair solution.
From complete tankless water heater installations to emergency repairs and annual maintenance services, Pacific Blue Mechanical delivers dependable workmanship and reliable hot water solutions for homeowners across Metro Vancouver.
The Navien NHW-199AI Premium Non-Condensing Tankless Water Heater is a premium indoor non-condensing gas tankless water heater.
Yes. It includes a built-in recirculation pump and buffer tank for faster hot water delivery and improved comfort.
Yes. The NHW-199AI is available for both natural gas (NG) and propane (LP) installations.
Yes. This model is specifically designed for indoor wall-mounted installations.
Yes. The NHW-199AI is cascading capable, allowing multiple units to operate together for larger hot water demands.
