Takagi TK-310U-I tankless water heater model is a direct replacement for T-K4-IN 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.
TK-310U-I indoor heater now includes a built-in temperature control on the front panel.
Cross-References:
- Rinnai: V75i (HE Series)
- State: GTS-310U-I
- American: GT-310U-I
- Factory-installed power cord with plug
- 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
- Flue vented using Cat. III stainless steel (such as Z-Vent or NovaVent)
- Electronic ignition - no pilot light
- Temperature controller on front panel
- Wall-mounting design with integrated brackets
- AHRI certified, Low-Lead compliant, Low Nox (SCAQMD Rule 1146.2 - California & Texas, NG models only)
- 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
- Flue/Exhaust: 4" (up to 60ft of pipe length equivalent, max. 6 elbows) - Cat III Stainless Steel only
- Combustion Air Intake: 3" (up to 60ft length, 6 elbows max) - Flexible Aluminum Duct, Cat. IV (PP, PVC or CPVC) or Cat. III (St. Steel)
- Installation Altitude: 0 - 2,000 (de-rate for higher elevations, up to 10,100ft max - see manual for details)
- Power Supply: 120V, 60Hz (factory wired plug-in cord)
- 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
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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