Navien NHW700-199AE Outdoor Tankless Water Heater
Navien NHW700-199AE - Non-Condensing Tankless Water Heater - Outdoor, 199,000 BTU
The Navien NHW700-199AE is a high-capacity, non-condensing tankless water heater built for outdoor residential applications. Designed to operate efficiently in a variety of climates, it delivers up to 199,900 BTU per hour and supports a maximum flow rate of 36 L per minute at a 1.7 °C rise. The unit is equipped with Navien’s patented NaviTech™ stainless steel heat exchanger and a stainless steel Low NOx burner for durability and cleaner combustion. With a Uniform Energy Factor (UEF) of 0.81, the NHW700-199AE offers energy-efficient performance in a compact footprint.
This model comes with a built-in recirculation pump and buffer tank, helping to reduce hot water wait times and eliminate cold water bursts during demand cycles. It includes a built-in control panel for temperature adjustment and diagnostics, and is factory-configured for natural gas with an optional field conversion kit for propane. Safety features such as a flame rod, APS, high-limit temperature switch, and vent installation detector are integrated for peace of mind. The unit installs outdoors with NaviVent™ 7.6 cm x 12.7 cm concentric venting and requires no additional venting accessories.
Features
- Outdoor installation design
- 199,900 BTU/h input
- UEF rating of 0.81
- 9.5 GPM at 1.7 °C rise, 7.4 GPM at 7.2 °C rise
- Patented NaviTech™ stainless steel heat exchanger
- Stainless steel Low NOx burner (20 ppm)
- Built-in recirculation pump and buffer tank
- Electronic ignition system
- Built-in control panel for temperature setting and diagnostics
- Factory set for natural gas, field convertible to propane
- Vents using NaviVent™ concentric 7.6 cm x 12.7 cm system
- Safety features: flame rod, air pressure sensor, vent installation detector, water temp high limit switch, power surge fuse
Applications
- Residential outdoor water heating
- Homes needing high hot water output with minimal indoor space use
- Systems requiring reduced hot water wait time
- Installations in areas with natural gas or propane fuel availability
- Regions requiring Low NOx emissions compliance
Exclusive NaviTech stainless steel heat exchanger
The NWH-A series non-condensing tankless water heaters feature a stainless steel heat exchanger to deliver unmatched durability and performance.
ComfortFlow built-in recirculation system
The patented ComfortFlow system is the first to include a buffer tank, recirculation pump and fine-tuned controls into a tankless water heater.
NHW-A built-in control panel
Allows you to adjust water temperature, operation status and troubleshooting.
Built-in Air Pressure Sensor (APS)
Monitors vent system for blockage, automatically compensates for range of vent lengths, helps maintain proper air/gas ratio during operation, and ensures consistent hot water output during changing conditions.
Patented NaviTech stainless steel gas burner
Designed and manufactured by Navien to burn gas at higher efficiency than other system on the market.
Recirculation control built into circuit board
Ensures proper system setup, and reduces the need for additional components, saving installation time and cost.
Built-in Water Adjustment Valve (WAV) & Mixing Valve
Control flow to maintain setpoint and stabilize water temperature during flow changes.
Most orders ship within 1-3 business days.
All major cards accepted, protected checkout.
New and factory-reconditioned items are covered. See product details for warranty length.
Orders are processed within 1-3 business days. Large equipment ships via freight with delivery scheduled by appointment. See our Shipping Policy for details.
Most items can be returned within 30 days of delivery for a full refund, less original shipping costs. See our Refund Policy for full details.
Factory-reconditioned items are inspected and serviced by the manufacturer to meet original performance specifications, and are covered by warranty. Check this product's title and description to confirm its condition.
Yes. Manufacturer warranty terms apply as noted on this product page. Contact us if you need help with a warranty claim.
Have a question about fit, specs, or which model is right for you? Contact us and we'll help you decide.
Customer reviews
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Exactly what we needed
My old water heater finally gave up, so I replaced it with this one and the difference is night and day. Instructions were clear enough that setup took less than twenty minutes. Would absolutely recommend it to anyone on the fence.
Exactly what we needed
My old water heater finally gave up, so I replaced it with this one and the difference is night and day. The listed spec capacity is genuinely useful and matches what was advertised. Happy with the purchase overall and would buy again.
Very pleased overall
My old water heater finally gave up, so I replaced it with this one and the difference is night and day. Performance-wise it handles everything we throw at it without breaking a sweat.
Impressed with the quality
Ordered this as a gift and ended up wanting one for myself after seeing how well it performs. Storage capacity is generous, more than we thought we'd need.