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| Attribute | Details |
|---|---|
| Make | A.O. Smith |
| Model | ATM-199X3 |
| Product Type | Tankless / Instant Water Heater |
| Maximum Flow Rate | 10.5 GPM |
| Heating Capacity | 199,000 BTU |
| Energy Efficiency | High Efficiency |
| Energy Star Certified | Yes |
| Installation Type | Wall Mounted |
| Dimensions | Compact Design (Space Saving) |
| Application | Residential & Commercial |
| Water Supply | Continuous Hot Water |
| Temperature Control | Advanced Digital Temperature Control |
| Safety Features | Overheat Protection, Auto Shut-Off |
| Suitable For | Multiple Bathrooms & Simultaneous Usage |
| Usage Areas | Homes, Apartments, Hotels, Clinics |
| Warranty | 5 Years Parts + 15 Years Heat Exchanger + 1 Year Labour |
The A.O. Smith ATM-199X3 is a high-capacity tankless water heater designed to deliver powerful and continuous hot water for residential and commercial use. With a strong heating capacity of 199,000 BTU and a flow rate of 10.5 GPM, this unit is built to handle multiple water outlets at the same time, making it ideal for large homes and high-demand environments.
Key Features
Continuous Hot Water Supply
The tankless design heats water only when needed, ensuring an uninterrupted supply of hot water without the limitations of a storage tank.
High Flow Rate – 10.5 GPM
Easily supports simultaneous use of showers, faucets, and appliances without compromising water pressure or temperature.
Powerful Heating Capacity – 199,000 BTU
Delivers fast and efficient heating performance, suitable for larger households and commercial applications.
Energy Efficient Operation
Reduces energy consumption by heating water on demand, helping lower electricity or gas bills compared to traditional water heaters.
Compact and Space Saving Design
Wall-mounted unit designed to save space, making it perfect for modern homes, apartments, and commercial setups.
Advanced Temperature Control
Maintains consistent and accurate water temperature for a comfortable and reliable experience.
Durable Build Quality
Engineered with high-quality components for long-lasting performance and dependable operation.
Multiple Safety Features
Equipped with safety systems such as overheat protection and automatic shut-off to ensure safe usage.
Why Buy A.O. Smith ATM-199X3 Tankless Water Heater
The ATM-199X3 is a reliable and high-performance solution for users who need continuous hot water with maximum efficiency. Its powerful heating capacity, energy-saving operation, and compact design make it a strong choice for both residential and commercial installations where performance and durability are essential.
Customer Reviews
10 reviews for A.O. Smith ATM-199X3 Tankless Water Heater 10.5 GPM, 199,000 BTU
Why Homeowners Trust Jimmy HVAC for Reliable Comfort
Reliable HVAC Solutions Built for Comfort, Efficiency, and Long-Term Peace of Mind.
Financing Options Available
Enjoy peace of mind with low monthly payments that make your costs easy to manage without compromising on quality.
Transparent, Upfront Pricing
No hidden charges—just honest, clear pricing so you always know exactly what to expect before work begins.
Free Installation Included
Enjoy hassle-free setup with free professional installation completed on every purchase.
Licensed & Certified Technicians
TSSA-licensed experts ensure safe, highly reliable, and precise system installations and diagnostic repairs.
Parts & Labour Warranty
Long-lasting protection with comprehensive parts coverage alongside our trusted, comprehensive labor guarantees.
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Professional HVAC Installation & Replacement
Jimmy HVAC provides professional installation, replacement, and system upgrades for residential and light commercial HVAC equipment throughout the Greater Toronto Area. Our certified technicians ensure every system is installed according to manufacturer specifications, Ontario building codes, and industry best practices.
Whether you are upgrading to a high-efficiency system, replacing ageing equipment, or installing a new HVAC solution, our team serves homeowners and property managers across the GTA with reliable service and transparent pricing.
Full-Service HVAC Solutions
- Furnace installation & replacement
- Air conditioner installation
- Heat pump systems
- Tankless water heaters
- Boiler systems
- HVAC system upgrades & retrofits
- Complete Commercial HVAC Solutions
- Preventative maintenance & system inspections
Benjamin Carter –
The A.O. Smith ATM-199X3 has been reliable so far. Install team knew what they were doing, though scheduling took an extra day.
Sophie Gagnon –
No more running out of hot water, which is great for our family. Jimmy HVAC arrived on time and finished the job same day.
Mason O’Reilly –
Good heater overall. Water pressure and temperature are steady. Pricing was slightly higher than expected but installation was clean.
Emma Clarkson –
Really like the space-saving design of this tankless system. Jimmy HVAC team was friendly and explained basic maintenance.
Lucas Pelletier –
Service was quick, booked and installed within a few days. Unit works fine, but I wish the initial explanation was a bit clearer.
Noah Singh –
The A.O. Smith ATM-199X3 is powerful and keeps up with multiple showers. Jimmy HVAC did a solid job with installation, no complaints.
Ava Tremblay –
Hot water is instant now. Big upgrade from our old tank. Happy with the product and the team was polite.
Ethan McAllister –
Jimmy HVAC handled the install of the ATM-199X3 tankless heater. Took a bit longer than expected, but the system itself performs great once up and running.
Chloe Bouchard –
Good experience overall. Pricing was reasonable compared to other quotes I got. The unit runs quietly and does the job.
Liam Fraser –
Got the A.O. Smith ATM-199X3 installed through Jimmy HVAC. Works well so far, hot water is consistent. Installation team was on time and cleaned up after.