Availability: In stock
Product Code: T-H35-IN
Categories: 2 ,



The T-H3S-DV-N supplies hot water to domestic hot water systems (directly or indirectly) which can be used with storage tanks, recirculation systems, hydronic heating systems, radiant floor systems, and/or domestic & heating applications.


The T-H3S is a high efficient, condensing, tankless water heater perfect for residential applications. With gas inputs of 180,000 BTU, the T-H3S can produce enough hot water for three bathrooms in warmer climates or two baths in colder climates.


  • ENERGY STAR® qualified
  • 15-year limited heat exchanger, 5 yrs limited parts Residential use
  • Energy Factor of 0.95 for Natural Gas
  • Maximum flow rate of 8.0 GPM at 35°F temperature rise (4.9 GPM at 70°F rise)
  • Primary heat exchanger utilizes HRS35 commercial-grade copper alloy for 25 times better heat transfer than stainless steel
  • Secondary heat exchanger utilizes 316L stainless steel for better corrosion resistance
  • Complies with Ultra-Low NOx regulations of less than 14 ng/J (<20ppm)
  • Integrated controls and power cord as standard features
  • Venting with Schedule 40 PVC, CPVC, PP, Category III stainless steel
  • Safety features include freeze, overheat, surge protection, and troubleshooting diagnostic codes


Emissions: Ultra Low NOx
Maximum BTUs: 180,000
Minimum BTUs: 19,500
Water Connection Location: Bottom
Water Connection: 0.75″
Flow Rate: 8.00
Heat Exchanger: Copper & Stainless
Voltage: AC 120V
Energy Factor: 0.95
ENERGY STAR® Qualified: Yes
Remote Control: No
Technology: Condensing
Multilink: No


Height: 22.50″
Width: 17.75″
Depth: 10.75″
Product Weight: 58 lbs.
Vent Type: Direct Vent
Vent Size: 4″