Takagi T-K4-IN-NG 8 GPM Indoor Tankless Water Heater, Natural Gas | Review

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Takagi is a prominent brand when it comes to water heater models. The Takagi T-K4-IN-NG Indoor Tankless Water Heater that works on natural gas is one of the most popular and highly efficient models known to meet up with hot water requirement of the household.

The water heater is used for indoor purposes only and has already proven to be a model with good demand in the market. The Takagi T-K4-IN-NG Indoor Tankless Water Heater was first introduced on September 13, 2010.

  1. Cost-effective

Takagi T-K4-IN-NG Indoor Tankless Water Heater is a highly cost-effective model that is known to come with advanced functionalities. The water heater works on natural gas and does not cost you much when it comes to energy usage. The model is not only cost-effective but also turns out to be environment-friendly.

Many gas-based water heaters are known to cause air pollution but this is not the case with this tankless water heater model. It comes with a direct vent conversion option and works at 11,000 – 190,000 BTU/hr. The maximum flow rate is 8 GPM (gallons per minute) with 0.82 energy factor. The model is Energy Star certified.

  1. Advanced features

The indoor tankless water heater comes with many advanced, beneficial features which includes air-fuel radio sensor, exhaust and safety control on water temperature, freeze protection mechanism nad power cord with manual reset feature.

Takagi T-K4-IN-NG Indoor Tankless Water Heater gives adequate importance to safety features. The exhaust and water temperature safety control feature ensures to keep the connection secure and safe for regular usage.

  1. Good capacity

Takagi T-K4-IN-NG Indoor Tankless Water Heater tops when it comes to capacity. It produces constant supply of hot water and is able to provide 200 gallons to 500 gallons of hot water per hour. The model is known to serve domestic as well as commercial needs.

  1. Compact model

The compact indoor tankless water heater model can be fitted into any space with ease. Takagi T-K4-IN-NG Indoor Tankless natural gas water heater weighs about 43 pounds and comes with a product dimension of 8.5 x 13.8 x 20.5 inches.

One can avail 12 year warranty period on heat exchanger, 1 year for labor and 5 years for parts but the tankless water heater should be installed by a licensed technician. If not, the warranty is not valid.



Certain Takagi T-K4-IN-NG Indoor Tankless Water Heater seems to have some problem in the maintenance and durability factors. However, the overall functionality turns out to be fair.

Customer Review

Takagi T-K4-IN-NG Indoor natural gas tankless water heater comes with a mix of positive reviews as well as negative reviews. Some users claims the model to be working in perfect condition and some others have major issues in its functionality. The stainless steel exhaust vent pump that is expected to be fitted with the water heater model turns out to be quite expensive. Overall, it provides users with a fair performing tankless water heater.

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