ADAPT™ 180 MBH Indoor/Outdoor Natural Gas Tankless Water Heater with X3® Scale Prevention - SSTHR180X3
The ADAPT™ 180 MBH Indoor/Outdoor Natural Gas Tankless Water Heater with X3® Scale Prevention delivers efficient, on-demand hot water with ENERGY STAR® certification and a 0.103 UEF. Its X3® Scale Prevention eliminates annual descaling and maintains like-new performance longer. The built-in control display allows easy monitoring, while the integrated recirculation pump ensures instant hot water when needed.
Designed for flexibility, it converts from natural gas to liquid propane with the included kit and can cascade up to 12 units for larger applications. The front panel controls simplify recirculation scheduling, reducing wait times. Whether installed indoors or outdoors, this unit delivers reliable, energy-efficient performance with minimal maintenance.
Features
- Energy Star Qualified
- ENERGY STAR® certified with a Uniform Energy Factor of 0.103
- No annual descaling required
- No conditioning period required when using new copper pipe
- Maintains like-new performance longer
- Approved to work with the integrated recirculation pump
- Cascade up to 12 like heaters together for larger applications requiring multiple water heaters to work in conjunction, cable included
- Field convertible from Natural Gas to Liquid Propane, kit included
- Features a built-in Control Display for checking heater status and error codes and for setting and reviewing up to two recirculating schedules
- Front panel controls make it simple to set your recirculation pump operation so you now that you will have hot water at your faucet
What Our Experts Think
High-Performance On-Demand Hot Water
This 180,000 BTU tankless water heater delivers continuous hot water without the limitations of a storage tank, making it ideal for homes with high hot-water demand.
X3® Scale Prevention Technology
Built-in X3® scale prevention protects the heat exchanger from mineral buildup, extending system life and eliminating the need for annual descaling.
Integrated Recirculation Pump
The built-in recirculation system helps reduce wait times for hot water at fixtures, improving comfort and efficiency throughout the home.
Energy-Efficient Condensing Design
The condensing heat exchanger maximizes efficiency, helping reduce energy consumption and operating costs while meeting modern efficiency standards.
Indoor or Outdoor Installation Flexibility
Designed for both indoor and outdoor installations with proper venting, allowing versatile placement options based on space and climate needs.
Q&A
Q: What fuel does this water heater use?
A: Natural Gas (field-convertible to Liquid Propane)
Q: How much heating capacity does it provide?
A: 180,000 BTU
Q: Does this unit require regular descaling?
A: No — X3® Scale Prevention eliminates the need for annual descaling.
Q: Is hot water available instantly?
A: Yes — the integrated recirculation pump helps deliver hot water faster to fixtures.
Q: Can it be installed outdoors?
A: Yes — suitable for both indoor and outdoor installations with appropriate venting.
Maintenance Tips
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Keep air intake and exhaust vents clear of debris
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Periodically check the recirculation pump and control panel
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Inspect gas connections for leaks or wear
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Flush the system occasionally to maintain peak flow performance
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Schedule annual professional inspection for long-term reliability
Damage 
Loss 
Theft 
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