R E S I D E N T I A L /
C O M M E R C I A L
TANKLESS ULTRA-LOW NOx
GAS WATER HEATERS
Indoor Models
GTS-110U-NI, GTS-310U-NI,
GTS-510U-NI
Fully modulating, gas fired,
tankless water heater with sealed
combustion and power vented
flue. Indoor and outdoor models
available for residential
applications. Supplies hot water to
domestic hot water systems
(directly or indirectly) can be used
with water storage tanks,
recirculation systems, hydronic
heating systems, radiant floor
heating systems, and/or combined
domestic & heating applications.
FEATURES
Complies with Ultra-Low
NOx Regulations
Maximum Flow Rates up
to 10.0 GPM
Primary Heat Exchanger
• Stronger than standard copper and more
resilient against erosion
Indoor and Outdoor
Models Are Available
Easy-Link Up to 4 Units
(510U Models Only)
• With no additional parts or
accessories needed
Multi-Link Up to 20 Units
(510U Models Only)
GTS-510U-NI and
GTS-510U-NE can be used
in both Residential and
Commercial Applications
Safety Features:
• Built-in Freeze Protection
• Manual Reset Hi Limit (Up to 194°F)
• Overheat Cutoff Fuse
• Inlet and Outlet Thermistors for
Constant Temperature Monitoring
• Air Fuel Ratio Rod
• Flame Sensor
Venting and Combustion
• 4” Category III Stainless Steel
• Vertical or Horizontal Installation
• 50’ Max Length, 5 Elbows max
(90° elbows = 5’ equivalent length)
• Power Vent
• Electronic Ignition - No Pilot Light
• 3” Combustion Air Intake (with
optional kit)
Outdoor Models
GTS-110U-NE, GTS-310U-NE,
GTS-510U-NE
Outdoor Models Include
Remote Control as a
Standard Feature
Indoor Models Include Both
a Remote Control and Power
®
Cord as Standard Features
ENERGY STAR
(510U models only)
Available in Natural Gas
Complies with Lead
ANSI Z21.10.3
CSA 4.3
For more information on Ultra-Low NOx Tankless Water Heaters contact:
State Water Heaters
500 Tennessee Waltz Parkway
Ashland City, TN 37015
800.365.0024 Toll-free USA
www.statewaterheaters.com
Free Standards
®
Qualified
Optional Accessories
• Complete Line of Stainless Steel Venting
• Recess Box (outdoor)
• Pipe Cover
• Direct Vent Conversion Kit (indoor)
• Isolation Valve Kits
• Backflow Preventor
• Concentric Termination Kits
Warranty
• 12-year limited warranty on heat
exchanger in residential applications
• 5-year limited warranty on heat exchanger
in commercial applications
• 5-year limited warranty on all parts
December 2012R
SBGSS00111
TANKLESS ULTRA-LOW NOX MODELS
RESIDENTIAL /
COMMERCIAL
GAS CONSUMPTION
INPUT
MODEL
NUMBER
GTS-110U-NI Natural 15,000 140,000 0.82 5.0 10.5 6.6 20-1/2 13-4/5 8-1/2 120 0.54 4” O.D. 3.0” O.D. 3/4” NPT 37
GTS-110U-NE Natural 15,000 140,000 0.82 5.0 10.5 6.6 20-1/2 13-4/5 8-1/2 120 0.54 N/A N/A 3/4” NPT 37
GTS-310U-NI Natural 15,000 190,000 0.82 5.0 10.5 8.0 20-1/2 13-4/5 8-1/2 120 0.83 4” O.D. 3.0” O.D. 3/4” NPT 37
GTS-310U-NE Natural 15,000 190,000 0.82 5.0 10.5 8.0 20-1/2 13-4/5 8-1/2 120 0.83 N/A N/A 3/4” NPT 37
GTS-510U-NI Natural 15,000 199,000 0.82 5.0 10.5 10.0 20-1/2 13-4/5 8-1/2 120 0.86 4” O.D. 3.0” O.D. 3/4” NPT 39
GTS-510U-NE Natural 15,000 199,000 0.82 5.0 10.5 10.0 20-1/2 13-4/5 8-1/2 120 0.86 N/A N/A 3/4” NPT 39
All dimensions in inches.
15-150 psi water pressure. 40 psi or above recommended for maximum flow.
* Category III required
**Current numbers based on factory testing, 0.4 GPM required for continuous fire after initial ignition.
Pressure only relief valve required (Min. 200,000 BTUs. 150 PSI). Min 50 PSI or above recommended for maximum flow.
Complies with Ultra-Low NOx regulations (SCAQMD Rule 1146.2) complies with 20pp NOx effective January 1, 2012.
Freeze protection draws 1.1 AMP
Indoor models are certified from sea level to 8,000 ft. elevations.
FUEL
TYPE
MIN.
BTU/H
BTU/H
MAX.
ENERGY
FAC TOR
(EF)
INLET GAS
PRESSURE
MIN.
W.C .
MAX
MAX.
GPM**
W.C . HEIGHT WIDTH DEPTH
DIMENSIONS
IN INCHES
VOLT AMP FLUE*
INTAKE
(OPTIONAL)
HOT/COLD
GAS
CONN.
WEIGHT
INDOOR MODEL
Front view
Side view
UNIT
(LBS)
3-5/8" (94 mm)
20-1/4" (520mm)
1-7/8" (47 mm)
HOT 4-5/8" (116 mm)
13-3/4" (350 mm)
10" (254 mm)
7" (180 mm)
∅4 (101 mm)
1-3/8" (36 mm)
120 VAC 1-5/8" (40 mm)
COLD 1-5/8" (41 mm)
GAS 5" (127 mm)
4-3/8" (113 mm)
2-1/4" (58 mm)
19-3/8" (493 mm)
1" (26 mm)
120 VAC 3" (75 mm)
GAS 5-1/4" (135 mm)
COLD 6" (153 mm)
HOT 6" (153 mm)
9-1/2" (241 mm)
CLEARANCES: Top 12”, Bottom 12”, Front 24”, Back 0.5”, Sides 2”
SCGSS01412 Page 2 of 4
OUTDOOR MODEL
RESIDENTIAL /
COMMERCIAL
Front view
13-3/4" (350 mm)
10" (254 mm)
7" (180 mm)
20-1/4" (520 mm)
Side view
3-5/8" (94 mm)
7" (203 mm)
5" (128 mm)
19-3/8" (493 mm)
1-5/8" (43 mm)
1" (26 mm)
120 VAC 3" (75 mm)
GAS 5-1/4" (135 mm)
COLD 6" (153 mm)
HOT 6" (153 mm)
9-1/2" (241 mm)
1-7/8" (47 mm)
HOT 4-5/8" (116 mm)
120 VAC 1-5/8" (40 mm)
COLD 1-5/8" (41 mm)
GAS 5" (127 mm)
CLEARANCES: Top 36”, Bottom 12”, Front 24”, Back 0.5”, Sides 2”
SBGSS00111 Page 3 of 4
RESIDENTIAL /
COMMERCIAL
110U Indoor/Outdoor Pressure Loss
50
40
30
20
Pressure Loss (psi)
10
0
0.0 2.0 4.0 6.0 8.0
Flow Rate (GPM)
310U Indoor/Outdoor Pressure Loss
50
40
30
20
Pressure Loss (psi)
10
0
0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0
Flow Rate (GPM)
120
100
80
60
40
20
0
120
100
80
60
40
20
0
Head Feet
110U Comparison of Flow Rate vs. Temperature Rise
7
6
5
4
Head Feet
3
2
Flow Rate (GPM)
1
0
0 20 40 60 80 100 120 140
Temperature Rise (°F)
310U Comparison of Flow Rate vs. Temperature Rise
9
8
7
6
5
4
3
Flow Rate (GPM)
2
1
0
0 20 40 60 80 100 120 140
Temperature Rise (°F)
510U Indoor/Outdoor Pressure Loss
Set temperature 130°F (55°C) or higher
80
70
60
50
40
30
20
Pressure Loss (psi)
10
0
Set temperature 125°F (52°C) or lower
0.0 2.0 4.0 6.0 8.0 10.0 12.0
Flow Rate (GPM)
120
100
80
60
40
20
0
510U Comparison of Flow Rate vs. Temperature Rise
Head Feet
Set temperature of 125°F & lower
12.0
11.0
10.0
9.0
8.0
7.0
6.0
Flow Rate (GPM)
5.0
4.0
3.0
2.0
1.0
0.0
0 20 40 60 80 100 120 140
Temperature Rise (°F)
Set temperature of 130°F & higher
Specification
Water heater(s) shall be Model_____________________ as manufactured by State Water Heaters. Water heater(s) shall be a copper coil integral n and tube construction with quick
release brass or bronze waterways. Heater(s) will be factory assembled and tested.
e heater shall be vented with 4” stainless steel Category III vent pipe or Special BH type gas vent at a distance not to exceed 50’ (equivalent) for 4” vent, terminating vertically or
horizontally as prescribed. Intake air pipe may be of such material as ABS, PVC, galvanized B-Vent, corrugated aluminum or stainless steel, or Category lll / IV stainless steel not to
exceed 50’ (equivalent) for 3” vent.
e heater(s) shall be controlled by an onboard solid-state printed circuit board monitoring incoming and outgoing temperatures with factory installed thermistors, sensing and
controlling ow rate to set point temperature, controlling both air and gas mixture inputs to maintain thermal combustion eciency. e heater(s) shall also consist of inline fusing, a
spark ignition and sensor system, aluminized stainless steel burners, an air-fuel ratio sensor, a hi-limit temperature switch, modulating and proportional gas valves, a freeze protection
sensor with ceramic heating blocks, and an overheat cuto fuse.
e water heater(s) shall be CSA listed, exceed the energy eciency requirements of ASHRAE 90.1b-1992, and shall comply with SCAQMD Rule 1146.2 complies with 20pp NOx
Ultra-Low NOx Standards.
For complete information on limited warranties, consult written warranty or contact technical support at 1-800-365-0024.
State Industries, Inc., reserves the right to make product changes or improvements without prior notice.
For more information on Ultra-Low NOx Tankless Water Heaters contact:
State Water Heaters
500 Tennessee Waltz Parkway
Ashland City, TN 37015
800.365.0024 Toll-free USA
www.statewaterheaters.com
SBGSS00111 Page 4 of 4 © 2012 State Industries, Inc. Printed in U.S.A
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