Residential / Commercial Gas
Ultra-Low NOx
Tankless Water Heaters
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 T
PRIMARY HEAT EXCHANGER
Primary Heat Exchange is constructed
of HRS35, a Commercial-Grade Copper
that is more resilient to erosion. HRS35
is 25x better at heat transfer than
stainless steel thus stabilizing outgoing
water temperatures quicker
INDOOR AND OUTDOOR
MODELS AVAILABLE
OUTDOOR MODELS INCLUDE
REMOTE CONTROL AS A
STANDARD FEATURE
INDOOR MODELS INCLUDE BOTH A
REMOTE CONTROL AND POWER
CORD AS STANDARD FEATURES
ENERGY STAR
AVAILABLE IN NATURAL GAS
EASY-LINK UP TO 4 UNITS
(T-D2U MODELS ONLY)
With no additional parts or
accessories needed
MULTI-LINK UP TO 20 UNITS
(T-D2U MODELS ONLY)
COMPLIES WITH LEAD
FREE STANDARDS
®
QUALIFIED
O
10.0 GPM
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)
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
15-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
INDOOR MODELS
T-KJr2U-IN-N, T-K4U-IN-N,
T-D2U-IN-N
OUTDOOR MODELS
T-KJr2U-OS-N, T-K4U-OS-N,
T-D2U-OS-N
T-D2U-IN AND T-D2U-OS
CAN BE USED IN BOTH
RESIDENTIAL AND
COMMERCIAL APPLICATIONS
Page 1 of 2 www.takagi.com TBGSS01212
(T-D2U models only)
®
ANSI Z21.10.3
CSA 4.3
Residential/Commercial Ultra-Low NOx Gas Tankless Water Heaters
Ultra-Low NOx Tankless Models
GAS CONSUMPTION
INPUT
MODEL
NUMBER
T-KJr2U-IN-N Natural 15,000 140,000 0.82 5.0 10.5 6.6 20-1/4 13-3/4 120 0.54 4” O.D. 3.0” O.D. 3/4” NPT 37
T-KJr2U-OS-N Natural 15,000 140,000 0.82 5.0 10.5 6.6 20-1/4 13-3/4 120 0.54 4” O.D. 3.0” O.D. 3/4” NPT 37
T-K4U-IN-N Natural 15,000 190,000
T-K4U-OS-N Natural 15,000 190,000
T-D2U-IN-N Natural 15,000 199,000
T-D2U-OS-N Natural 15,000 199,000 0.82 5.0 10.5 10.0 20-1/4 13-3/4 120 0.86 4” O.D. 3.0” O.D. 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) 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
MAX.
BTU/H
ENERGY
FACTOR
(EF)
0.82 5.0 10.5 8.0 20-1/4 13-3/4 120 0.83 4” O.D. 3.0” O.D. 3/4” NPT 37
0.82 5.0 10.5 8.0 20-1/4 13-3/4 120 0.83 4” O.D. 3.0” O.D. 3/4” NPT 37
0.82 5.0 10.5 10.0 20-1/4 13-3/4 120 0.86 4” O.D. 3.0” O.D. 3/4” NPT 39
INLET GAS
PRESSURE
MIN.
W.C.
MAX.
W.C.
DIMENSIONS IN INCHES
MAX
HEIGHT WIDTH DEPTH
GPM**
VOLT AMP FLUE*
9-1/2
9-1/2
9-1/2
9-1/2
9-1/2
9-1/2
INTAKE
(OPTIONAL)
HOT/COLD
GAS
CONN.
SHIPPING
INDOOR MODEL
Front view
Side view
APPROX.
WEIGHT
(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)
CLEARANCES: Top 12”, Bottom 12”, Front 24”, Back 0.5”, Sides 2”
∅
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)
Page 2 of 4 www.takagi.com TBGSS01212
Residential/Commercial Ultra-Low NOx Gas Tankless Water Heaters
OUTDOOR MODEL
Front view
13-3/4" (350 mm)
10" (254 mm)
7" (180 mm)
20-1/4" (520 mm)
Side view
4" (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”
Page 3 of 4 www.takagi.com TBGSS01212
Residential /Commercial Gas
Ultra-Low NOx
Tankless Water Heaters
T-KJr2U 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)
T-K4U 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
T-KJr2U Comparison of Flow Rate vs. Temperature Rise
120
100
80
60
40
20
0
Head Feet
7
6
5
4
3
2
Flow Rate (GPM)
1
0
0 20 40 60 80 100 120 140
Temperature Rise (°F)
T-K4U Comparison of Flow Rate vs. Temperature Rise
9
8
7
6
5
Head Feet
4
3
Flow Rate (GPM)
2
1
0
0 20 40 60 80 100 120 140
emperature Rise (°F)
T
T-D2U Indoor/Outdoor Pressure Loss T-D2U Comparison of Flow Rate vs. Temperature Rise
Set temperature 125°F (52°C) or lower
80
Set temperature 130°F (55°C) or higher
70
60
50
40
30
20
Pressure Loss (psi)
10
0
0.0 2.0 4.0 6.0 8.0 10.0 12.0
Flow Rate (GPM)
120
100
80
60
40
20
0
Head Feet
Set temperature 125°F (52°C) or 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)
Specification
Water heater(s) shall be Model_____________________ as manufactured by Takagi. Water heater(s) shall be a copper coil integral fin and tube construction with quick release brass or
bronze waterways. Heater(s) will be factory assembled and tested.
The 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.
The 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
flow rate to set point temperature, controlling both air and gas mixture inputs to maintain thermal combustion efficiency. The 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 cutoff fuse.
The water heater(s) shall be CSA listed, exceed the energy efficiency requirements of ASHRAE 90.1b-2007, and shall comply with SCAQMD Rule 1146.2 Ultra-Low NOx Standards.
Set temperature 130°F (55°C) or higher
Page 4 of 4 www.takagi.com TBGSS01212
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