State GTS-110U-NE User Manual

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