Takagi T-D2U User Manual
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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.
®
ANSI Z21.10.3
CSA 4.3
OUTDOOR MODELS
T-KJr2U-OS-N, T-K4U-OS-N,
T-D2U-OS-N
INDOOR MODELS
T-KJr2U-IN-N, T-K4U-IN-N,
T-D2U-IN-N
Page 1 of 2 www.takagi.com TBGSS01212
(T-D2U models only)
FEATURES
COMPLIES WITH ULTRA-LOW
NOx REGULATIONS
MAXIMUM FLOW RATES UP T
O
10.0 GPM
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
®
QUALIFIED
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
T-D2U-IN AND T-D2U-OS
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)
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
255045_TBGSS91212.indd 1255045_TBGSS91212.indd 1 3/25/13 2:47 PM3/25/13 2:47 PM
Summary of Contents
Page 1 - Tankless Water Heaters
Residential / Commercial Gas Ultra-Low NOx Tankless Water HeatersFully modulating, gas fired, tankless water heater with sealedcombustion and power ve
Page 2 - Front view
Residential/Commercial Ultra-Low NOx Gas Tankless Water HeatersPage 2 of 4 www.takagi.com TBGSS01212All dimensions in inches.15-150 psi water pressure
Page 3
Residential/Commercial Ultra-Low NOx Gas Tankless Water HeatersPage 3 of 4 www.takagi.com TBGSS01212OUTDOOR MODELSide viewFront view1" (26 mm)19-
Page 4 - Residential /Commercial Gas
Residential /Commercial Gas Ultra-Low NOx Tankless Water HeatersPage 4 of 4 www.takagi.com TBGSS01212SpecificationWater heater(s) shall be Model______
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