Description

Takagi TK-310U-E outdoor tankless water heater model is a direct replacement for T-K4-OS Natural (NG) and Propane (LP) gas non-condensing models and is intended for small to medium residential applications. The new unit uses natural gas by default and comes with a propane conversion kit. The heater includes a remote temperature control.

Cross-References:

Rinnai: V75e (HE Series)
Navien: NPN-180-E
State: GTS-310U-E
American: GT-310U-E

Features:

Remote temperature controller included
Field convertible from Natural Gas to Propane (kit included)
Fully modulating, non-condensing, with copper heat exchanger
Up to 8.0 GPM max flow rate
Built-in safety features include freeze protection, manual reset hi limit (up to 194F), overheat cut-off fuse, inlet & outlet thermistors (for constant temperature monitoring), air-fuel ratio rod and flame sensor
Outdoor model – no vent pipes needed
Electronic ignition – no pilot light
Wall-mounting design with integrated brackets
AHRI certified, Low-Lead compliant, Low Nox (SCAQMD Rule 1146.2 – California & Texas, NG models only)

Technical Specifications:

Shower Capacity: 3 – 2 Showers (4.2 GPM @ 75°F rise; 5.8 GPM @ 55°F rise; 8.0 GPM @ 40°F rise)
Min Flow: 0.4 GPM
Gas Input (Min – Max): 15,000 – 190,000 BTU/h
Fuel Type: Natural Gas (4 – 10.5 WC pressure) or Propane (8 – 14 WC pressure) – LP conversion kit included
UEF: 0.81
Hot & Cold Water Connections: 3/4″ NPT
Gas Connection: 3/4″ NPT
Installation Altitude: 0 – 2,000 (de-rate for higher elevations, up to 10,100ft max – see manual for details)
Power Supply: 120V, 60Hz (hardwired)
Consumption: 79W Operation, 2W Stand-by, 96W Freeze protection
Dimensions: 13-3/4″ Wide x 22-1/2″ High x 10″ Deep
Weight: 37.5 lbs

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