Takagi TK-310U-E Outdoor Tankless Water Heater, Natural/Propane Gas Convertible, 190KBTU (replaces T-K4-OS NG & LP)
Brand: Takagi
Part#: TK-310U-E
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
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