TK-4-IN Takagi Tankless Indoor Water Heater (Propane)

Application: 2-3 Showers
Product Type: Tankless Heater
Fuel Type: Propane
Installation Type: Indoor Only
Direct Vent Convertible
Energy Factor: 0.82
Vent Size: 4″
Vent Type: Category III Stainless Steel
Inlet Gas Pressure: 8.0″-14.0″W.C.
Warranty: 12 Year Ltd. Warranty on Heat Exchanger/ 5 Year on Parts
Energy Star Rated: Yes
Height: 20.3″
Width: 13.8″
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°-167°F
PSI Range: 15-150 psi
Weight (lbs): 38 lbs



Note: Isolation valves are not included but are recommended for installaltion.

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.


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: 8.0″ W.C. / Max 14.0″ W.C.
Dimensions: 20.3″ H x 13.8″ W x 8.5″ D
Direct Vent Capability
Electric Ignition