No Tank, No Fuss. Just Smart Hot Water with ADAPT™

Instant hot water, fewer hassles. ADAPT™ by State Water Heaters delivers peak performance, longer life, and less maintenance.

Adapt™+ Premium Condensing

Adapt™ Standard Condensing

Adapt™ Non-Condensing

Adapt™ Standard Condensing

On-demand hot water

X3® Scale Prevention Technology

Rebates & Tax Incentives Available

Adapt™+ Premium Condensing

On-demand hot water

X3® Scale Prevention Technology

Rebates & Tax Incentives Available

Integrated Recirculation Pump

Adapt™ Standard Condensing

State’s ADAPT™ SC Standard Condensing tankless water heaters are available in 160k, 180k, and 199k BTU/Hr configurations. These natural gas models deliver a maximum flow rate of up to 10.5 GPM, providing strong, on-demand performance with the flexibility to install in nearly any setting.

The ADAPT™ SC series offers two design options, models with integrated X3® Scale Prevention Technology and Bypass (M) models. Scale prevention can easily be added to any M model by replacing the bypass cartridge with an optional X3 cartridge, sold separately. The optional X3® Scale Prevention Technology helps protect the heat exchanger from mineral buildup, maintaining like-new performance and extending the life of the unit up to three times longer than standard tankless water heaters.

All Adapt™ SC water heaters feature a built-in control display for adjusting settings and viewing heater status and error codes. ENERGY STAR® certified with a Uniform Energy Factor (UEF) of 0.95, these models also meet Ultra-Low NOx emission standards.

ADAPT™ SC models are suitable for both indoor and outdoor installation (outdoor vent cap kit sold separately) and can be cascaded, up to 12 units, for larger applications, with the necessary cable included.

Featured Products

Adapt™ SC Standard Condensing Ultra-Low NOx 199,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention Technology Model STM-199X3-N 100

ENERGY STAR® certified with a UEF of 0.95
199,000 BTU input
15-year limited warranty

Adapt™ SC Standard Condensing 199,000 BTU Natural Gas Tankless Water Heater Model STM-199M-N 100

ENERGY STAR® certified with a UEF of 0.95
199,000 BTU input
15-year limited warranty

Adapt™ SC Standard Condensing Ultra-Low NOx 180,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention Technology Model STM-180X3-N 100

ENERGY STAR® certified with a UEF of 0.95
180,000 BTU input
15-year limited warranty

Adapt™ SC Standard Condensing 180,000 BTU Natural Gas Tankless Water Heater Model STM-180M-N 100

ENERGY STAR® certified with a UEF of 0.95
180,000 BTU input
15-year limited warranty

Adapt™ SC Standard Condensing Ultra-Low NOx 160,000 BTU Natural Gas Tankless Water Heater with X3® Scale Prevention Technology Model STM-160X3-N 100

ENERGY STAR® certified with a UEF of 0.95
160,000 BTU input
15-year limited warranty

Adapt™ SC Standard Condensing 160,000 BTU Natural Gas Tankless Water Heater Model STM-160M-N 100

ENERGY STAR® certified with a UEF of 0.95
160,000 BTU input
15-year limited warranty

How it works

Adapt™ SC standard condensing tankless water heaters by State offers an efficient solution for continuous hot water supply. Unlike traditional tank systems, it heats water on demand, ensuring you have hot water whenever needed without the energy losses associated with storing heated water.

When the hot water tap is activated, cold water enters the unit, triggering the system to ignite its gas burner. This burner heats the water as it flows through the primary heat exchanger. Then water passes through a secondary heat exchanger, which captures residual heat from the exhaust gases. This dual-exchanger process enhances energy efficiency, achieving a Uniform Energy Factor (UEF) of 0.95, meaning 95% of the energy consumed is effectively converted into hot water.

The Adapt™ SC models are designed for flexibility, allowing installation in various settings, either indoors or outdoors, with an optional vent cap kit. They support PVC venting up to 150 feet, accommodating diverse installation requirements. Additionally, for homes with higher hot water demands, up to 12 units can be linked together, ensuring a consistent and ample hot water supply.

These water heaters feature a built-in control display, enabling users to monitor system status, adjust settings, and view error codes easily. Certain models feature integrated X3® Scale Prevention Technology, while the feature can be added as an optional accessory for Bypass (M) models. Patented, the X3 technology protects against scale buildup and extends the lifespan of the heat exchanger.

Rebates & Tax Credits

Up to $850 in Local Utility Rebates may be available in your area!

View Rebates

*Gas water heaters with UEF of 0.82 or higher OR with a thermal efficiency of at least 90%. Local utility rebates available in limited geographical areas. For information on the Federal Tax Credit, go to: energystar.gov. Check with your tax advisor for applicability. Offer details and expiration may vary. See Rebate Center for details.

Still Have Questions?

A gas tankless water heater is more efficient than a conventional tank water heater, as it doesn't require energy to keep a reservoir of water heated around the clock. Water flows to a heat exchanger that immediately heats the water using hot exhaust gasses. According to the U.S. Department of Energy, a tankless water heater is up to 34% more energy efficient than a tank water heater for homes using less than 41 gallons of water per day and up to 14% more efficient for homes using 86 gallons of water daily. It's also more compact than a tank water heater, saving space.

Tankless water heaters offer the option of venting through an exterior side wall instead of through a chimney flue on the roof. Water heaters that are direct venting have two vents — one that pulls in air from the outside and one that carries away exhaust. Power venting water heaters draw air from inside the room and have only a single vent for exhaust. While non-condensing tankless water heaters require thick metal venting to handle the temperature of heat that's released, condensing tankless water heaters can use plastic venting such as PVC. They have already used the hot vapors to heat more water, leaving only cooler fumes for ventilation.

State tankless water heaters boast industry-leading 15 year limited warranties. While the lifespan of a gas tankless water heater can vary, factors like water conditions, usage rates and maintenance all contribute to your water heater’s health. New condensing units come equipped with X3® Scale Reduction Technology that extends life up to three times longer.

Tankless water heaters have different flow rates measured in gallons per minute (GPM), which indicate the amount of water they can deliver at a time. Because these water heaters don't maintain a supply of hot water in a tank, you need to choose an appropriately sized tankless model based on household needs. The ideal output rate for your home depends on the number of people in the residence, the appliances you use, and the original temperature of the water being heated. Some people install more than one tankless water heater based on their requirements. Check out our water heater selector to help choose the best water heater for your needs.

What do I need?
Before installation, you will need to determine the incoming ground water temperature, the ideal location in your home, and the correct water heater size required for your needs.
Where to install?
A tankless water heater can be installed anywhere in your home with the correct piping—closets, garage, bathrooms, etc. In warmer climates where there is no risk of freezing, a tankless water heater may be installed on the exterior of the home to save on interior space.