Excellent 4.9 | 18,452 reviews

State Proline XE Series 199,000 BTU Condensing Gas Tankless Water Heater - SGTS540X3NIH

State Proline XE Series 199,000 BTU Condensing Gas Tankless Water Heater - SGTS540X3NIH

$1,391.99
$1,391.99 $1,855.28
SAVE 24% Sold out
State Proline XE Series 199,000 BTU Condensing Gas Tankless Water Heater - SGTS540X3NIH

State Proline XE Series 199,000 BTU Condensing Gas Tankless Water Heater - SGTS540X3NIH

$1,391.99
$1,391.99 $1,855.28
SAVE 24% Sold out

State Proline XE Series 199,000 BTU Condensing Gas Tankless Water Heater - SGTS540X3NIH

The Proline XE Condensing Ultra-Low NOx series with X3 Scale Prevention Technology is well suited for residential applications. State has combined water heating and treatment in a product designed to revolutionize tankless water heating. Their new condensing gas tankless line features X3 Scale Prevention Technology to last three times longer than other tankless models without X3 Technology.

The GTS-540X3-NIH tankless water heater uses up to 199,000 BTU/hr of natural gas to deliver an endless supply of hot water for a 3 bath home in northern climates and up to a 4 bath home in southern climates (one shower head per bath).

Features
  • Energy Star Qualified
  • X3 Scale Prevention Technology
  • No annual descaling required
  • No scale buildup means the heater lasts 3 times longer than competiros and maintains like-new performance longer
  • Primary heat exchanger is constructed of a commercial-grade copper that is more resilient to corrorsion than other materials
  • Secondary heat exchanger is made of 316L Stainless Steel to protect against corrosion
  • Qualified as lead free under the Safe Drinking Water Act
  • Exhaust and water temperature safety controls
  • Overheat cut-off fuse
  • Air-fuel ratio (AFR) sensor
  • Internal freeze protection system
  • Tankless water heaters with X3 Technology are approved to work with an external recirculation pump and cross-over valve
  • Category III or IV venting can be used
What Our Experts Think

  • Exceptional energy efficiency with 199,000 BTU output.

  • X3 Scale Prevention Technology extends lifespan up to 3x compared to standard models.

  • Ultra-Low NOx design ensures environmentally friendly operation.

  • Ideal for residential use, supporting continuous hot water without interruptions.

  • Reliable condensing technology maximizes heat recovery and reduces energy costs.

Q&A

  • Q: What applications is this heater suitable for?
    A: Residential homes needing high-efficiency, continuous hot water.

  • Q: How does X3 Technology help?
    A: Prevents scale buildup, reducing maintenance and extending lifespan.

  • Q: Is it eco-friendly?
    A: Yes, it operates with Ultra-Low NOx emissions.

  • Q: What is the BTU rating?
    A: 199,000 BTU for high-demand water heating.

Maintenance Tips

  • Flush the unit annually to remove mineral buildup.

  • Inspect inlet filters and clean regularly for optimal performance.

  • Check venting and gas connections periodically.

  • Schedule professional servicing every 1–2 years for best efficiency.

  • Use water treatment solutions compatible with X3 Technology to prevent scaling.

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