Takagi TK4OSNG

T-K4-OS-NG Tankless Outdoor Water Heater: Natural Gas

Christmas Appliance Sale

View and share related images
Takagi Products
Model #:

Takagi TK4OSNG

Takagi T-K4-OS-NG Tankless Outdoor Water Heater: Natural Gas
Rating: (Write a Review)
Availability: In Stock [Details] QuickShip
Fuel Type:

Shipping: FREE
Today's Price: $935.00
(Why don't we show the price?)


Condition:Brand New Factory Sealed With 1 Year USA Warranty
For installation promos & shipping promos.

Product Promotion

0% Easy Financing! No Payments, No interest for 6 Months

Payment Options Why Buy From Us

Takagi Products
Quick Specs:
Brand: Takagi
Stock Id: SID256116
Type: Tankless Heater
Fuel Type: Natural Gas
Width: 13.8"
Height: 20.3"
Technical Details
Installation Type: Outdoor Only
Weight (lbs): 38 lbs
Depth (Inches): 8.5"
Temperature Range (F): 99-167F
Water Connection: 3/4"
Gas Connection: 3/4"
Gas Input: 11000-190000 BTU/h
Energy factor: 0.82
Inlet Gas Pressure: 5.0-10.5"W.C.
Manifold Pressure: 2.0-2.5"W.C.
Max Flow (GPM): 8
PSI Range: 15-150 psi

Released in 2010, the T-K4 improves upon many of the features from the T-K3. The T-K4 is one of Takagi's smaller tankless water heaters. At 13.8 inches wide and weighing only 38 pounds, its ultra-compact design allows it to be mounted on a wall.

Takagi's newest tankless water heater also features an energy factor of 0.82, so it is extremely efficient and environmentally friendly. Since tankless water heaters only burn gas when hot water is needed, installing this unit can help homeowners save up to 45% on their monthly gas bills.

The T-K4-OS has a built-in power venting system and was designed specifically for outdoor installations. The T-K4-OS does not require any additional Category III venting or vent caps, making installation one step easier for installers.


  • Capacity: 2 to 3 Bathrooms
  • Flow Rate: Maximum 8.0 GPM
  • Gas Inputs: 11,000 to 190,000 BTU per hour
  • Energy Factor Rating: 0.82
  • Inlet Gas Pressure: Min: 5.0" W.C. / Max 10.5" W.C.
  • Dimensions: 20.3" H x 13.8" W x 8.5" D
  • No Venting Required
  • Electric Ignition


Application:2-3 Showers
Product Type:Tankless Heater
Fuel Type:Natural Gas/Propane
Installation Type:Outdoor Only
Energy Factor:0.82
Inlet Gas Pressure:5.0-10.5"W.C.
Manifold Pressure:2.0-2.5"W.C.
Depth (Inches):8.5"
Max Flow (GPM):8
Gas Input:11000-190000 BTU/h
Water Connection:3/4"
Gas Connection:3/4"
Temperature Range (F):99-167F
PSI Range:15-150 psi
Weight (lbs):38 lbs

Takagi TK4OSNG Reviews & Ratings

5 Star:
0 Reviews
4 Star:
0 Reviews
3 Star:
0 Reviews
2 Star:
0 Reviews
1 Star:
0 Reviews
Share your thoughts with other customers:

Shipping Methods & Details

  • Please enter your shipping ZIP Code to get available shipping methods and cost: