ADAPT™ + PREMIUM
NO SCALE. NO FLUSHING. NO LIMITS. JUST LOTS OF HOT WATER.
Introducing A. O. Smith's ADAPT™ + Premium
A. O. Smith's ADAPT™ + Premium Condensing Gas Tankless Water Heater, featuring X3® Scale Prevention Technology and an Integrated Recirculation Pump, delivers robust, on-demand performance. These high-efficiency heaters are designed for practically any residential setting. The single stainless steel, heavy-duty heat exchanger is more resilient to scale buildup and corrosion. When combined with X3 Scale Prevention Technology, lifetime descaling maintenance is eliminated.
The unit is depicted as a modern, compact tankless water heater with an ENERGY STAR certification and labeled 'XX3 TECHNOLOGY'. It shows connections for gas and water, with a digital display on the front.
Model Specifications
Models with Integrated X3® Scale Prevention Technology
| Model | Height | Width | Depth | Weight |
|---|---|---|---|---|
| ATHR-160X3 | 41.8" (106.2 cm) | 16.5" (42 cm) | 16.1" (41 cm) | 104 lb. (47.2 kg) |
| ATHR-180X3 | 41.8" (106.2 cm) | 16.5" (42 cm) | 16.1" (41 cm) | 104 lb. (47.2 kg) |
| ATHR-199X3 | 41.8" (106.2 cm) | 16.5" (42 cm) | 16.1" (41 cm) | 104 lb. (47.2 kg) |
Models with Bypass (Easily Add Scale Prevention Any Time*)
| Model | Height | Width | Depth | Weight |
|---|---|---|---|---|
| ATHR-160M | 33.8" (85.9 cm) | 16.5" (42 cm) | 16.1" (41 cm) | 104 lb. (47.2 kg) |
| ATHR-180M | 33.8" (85.9 cm) | 16.5" (42 cm) | 16.1" (41 cm) | 104 lb. (47.2 kg) |
| ATHR-199M | 33.8" (85.9 cm) | 16.5" (42 cm) | 16.1" (41 cm) | 104 lb. (47.2 kg) |
*X3 Scale Prevention Cartridge Kit Sold Separately
ADAPT™+ UNIVERSAL CONFIGURATIONS
The ADAPT™+ Premium series offers versatile installation options, suitable for both indoor and outdoor environments. The product line includes models like the ATHR-199M and ATHR-199X3, available in configurations for indoor use and outdoor installation (requiring an Outdoor Vent Cap Kit, sold separately).
Four configurations are shown: an indoor unit labeled ATHR-199M with 'XX3 TECHNOLOGY', an outdoor unit labeled ATHR-199M, an outdoor unit labeled ATHR-199X3, and an indoor unit labeled ATHR-199X3. All units feature a digital display and prominent branding.
X3® Scale Prevention Technology
- Extends the life of the unit up to three times longer*
- No warranty exclusions for hard water with X3 models
- Maintains "like-new" performance longer
- Easily add scale prevention to M models, kit sold separately
*Compared to other tankless models without X3 Technology
Key Features
- Integrated Recirculation Pump
- Available in 160k, 180k, 199k BTU/h
- Field convertible from Natural Gas to Liquid Propane (Kit Included)
- Universal install, Indoor or Outdoor**
- 9k BTU minimum input
- 22:1 Turndown Ratio (199k BTU/h model)
- 0.95 UEF (Energy Star certified)
- Max flow rate 10.5 GPM, 0.4 GPM activation
- Ultra-Low NOx emissions
- 1/2" Gas Line
- Venting Flexibility: 2" up to 75' & 3" up to 150'
**Outdoor Vent Cap Kit Required, Kit Sold Separately
Hard Water Performance Comparison
A comparison highlights the durability of tankless water heaters in hard water conditions:
- Unprotected tankless: Failed at 5.8 simulated years and 136,000 gallons.
- Tankless with X3 Technology: Still running after 19.7 simulated years and 460,000 gallons.
