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142 Total Reviews Harmonic Heating & Air Conditioning


Condensing Gas Tankless Water Heater

State condensing tankless water heaters are well suited for residential/commercial applications such as small restaurants and beauty salons. Remote control included as a standard feature. Indoor models are certified up to 10'100 ft. altitude. Provides a variety of installation options: outdoor and direct vent. Complies with Ultra-Low NOx regulations and meets the energy efficiency requirements of ASHRAE 90.1b-1992. Easy-Link System capable up to 4 units. Multi-Link System capable up to 20 units.

  • Ultra-Low NOx Condensing Technology Provides Unprecedented 0.95 Energy Factor
  • Primary Heat Exchanger is constructed of HRS35 Commercial-Grade Copper which is more resilient against erosion
  • Secondary Heat Exchanger is made of Type 316L Stainless Steel to protect against corrosion
  • Continuous Maximum Flow Rates up to 10.0 GPM
  • NG or LP
  • Indoor Models Includes a Built-In Temperature Controller and Advanced Diagnostics to Simplify Troubleshooting
  • Outdoor Models Include a Wall Mount Temperature Remote Controller and Advanced Diagnostics to Simplify Troubleshooting
  • Internal Freeze Protection System
MODELConfigurationMax
MBtuH
Min
MBtuH
Flow Rate
GPM
UEFTemp.
Range
Dimensions
HxWxD
Weight
Lbs.
GTS-240-NIHInterior NG 160.0 15.0 6.60 0.95 22.5x17.75x10.75 58
GTS-340-NIHInterior NG 180.0 13.0 8.00 0.95 22.5x17.75x10.75 58
GTS-540-NIHInterior NG 199.0 15.0 10.00 0.95 22.5x17.75x10.75 59
GTS-240-PIHInterior LP 160.0 13.0 6.60 0.95 22.5x17.75x10.75 58
GTS-340-PIHInterior LP 180.0 13.0 8.00 0.95 22.5x17.75x10.75 58
GTS-540-PIHInterior 199.0 13.0 10.00 0.95 22.5x17.75x10.75 59
GTS-240-NEHExterior NG 160.0 15.0 6.60 0.95 22.5x17.75x10.75 58
GTS-240-PEHExterior LP 160.0 13.0 6.60 0.95 22.5x17.75x10.75 28
GTS-340-NEHExterior NG 180.0 15.0 8.00 0.95 22.5x17.75x10.75 58
GTS-340-PEHExterior LP 180.0 15.0 8.00 0.95 22.5x17.75x10.75 58
GTS-540-NEHExterior NG 199.0 15.0 10.00 0.95 22.5x17.75x10.75 59
GTS-540-PEHExterior 199.0 13.0 10.00 0.95 22.5x17.75x10.75 59

Warranty Information

  • All Parts for 60 months -
  • Heat Exchanger for 144 months -

Available Documents


State Tankless Water Heater Standard Warranty

All models include 15 year Heat Exchanger + 5 year Parts + 1 year labor warranty.
Additional service and maintenance can be covered by our VIP or Total Rock*Star Plans.


EXCLUSIVE 12 YEAR GENERAL PARTS WARRANTY

We customize your comfort by making your home smarter, healthier and more efficient. Your peace of mind is as important to us as your comfort.

That's why every product us backed by warranties as robust and dependable as the products themselves.

Every piece of heating & cooling equipment is eligible for a 12-Year Parts Warranty, when you join the "Rock*Star Maintenance Program".

All other products are eligible for the 12-Year Parts Warranty.

Ask for details, terms, and conditions. All product warranties are registered by Harmonic within 30 days of purchase.

EXCLUSIVE 12 YEAR LABOR WARRANTY
on all equipment repairs, indoor air quality & comfort items

Including humidifiers, air filters, air cleaners, thermostats and more! 12 year parts and labor warranty requires joining Rock*Star Maintenance Program. Ask for details, terms, and conditions.

The "Exclusive 12-year Parts & Labor Warranty" covers parts and labor cost from the time of purchase. "Exclusive 12-year Parts & Labor Warranty" requires annual maintenance to be performed by Harmonic Heating & Air Conditioning beginning immediately from the time of purchase. Maintenance must be performed annually during the initial 12-year coverage term in order to uphold warranty status. If annual maintenance is missed or not performed by Harmonic Heating & Air Conditioning, the "Exclusive 12-year Parts & Labor Warranty" becomes void immediately. Warranty coverage defaults to a 10 year part warranty and a 2 year labor warranty from the time of purchase. Warranty is registered to the purchaser and is not transferable.

1ST YEAR OF MAINTENANCE IS FREE!

when you purchase a Furnace or Air Conditioner from Harmonic!