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

Warranty

This unit comes with a 15-year limited warranty on the heat exchanger when used in residential application. It also comes with a 5-year limited warranty on all parts. Additionally, this unit has no hardwater exclusions in the industry’s first “peace of mind” limited warranty.