Detail review of Takagi T-K4 tankless water heaters. T-K4 units are designed for residential water heating in high demanding homes, that are using propane and natural gas, and are installed outdoor and indoor.
There are two gas models from T-K4 series and two from T-K4U (Ultra Low NOx models), all designed as the non-condensing units:
Takagi T-K4 water heaters are using the tankless technology for the on-demand water heating, while providing continuous and endless supply of hot water. During the water heating, water heater adjusts its power by using the fully modulating gas valve, for the optimized operation.
The modulation allows water heaters to work in the range from the minimum 11,000 Btu/hr to the maximum 190,000 Btu/hr, either using the propane or natural gas. In both cases, energy factor is 0.82 or higher, which makes these units energy efficient and also green, with the reduced emission of green house gases.
Remote control is included for the convenient use - the temperature of hot water can be set in the range from 99 F to 167 F (16 options), also to monitor the heating operation and see when something is wrong with the unit. If the remote control is not used, you can select one of four temperatures by changing the dip-switch settings on the computer board: 113, 122, 131 and 140 F where the 122 F is factory preset value.
The flow rate through the water heater is limited to 8 gallons per minute, which can supply up to four showers at the same time (calculated household flow rate for shower is 2 GPM). The minimum flow rate, which activates the water heater, is 0.75 GPM while 0.4 GPM is the minimum flow that keeps these gas water heaters running.
T-K4 water heaters are self-diagnostic. The diagnostic system allows easy troubleshooting and repair. If something is wrong with the unit, and you have a remote control, TK-RE02, installed, the error code will display, or if the controller is not installed, red LED will be blinking.
If you are looking for a tankless water heater with an endless hot water, with on-demand operation, that is compact and has space saving design; and you live in the house with the high demand hot water supply, Takagi T-K4 is a good choice for you. By being the energy efficient, these water heaters save the energy and with the computerized safety system, protect you and your home. The warranty is 15 years on the heat exchanger, 5 on other components and 1 on labor, which is very similar to most of the manufacturers in North America.
Pictures are courtesy of Takagi WH company