We installed 2 Takagi TK-1 flash heaters in our newly remodeled house. Everything worked fine for 4 weeks, but now we are having problems. The hot water is taking much longer to reach the faucet as before, and the temperature will not remain constant. Any ideas as to what is going on? Does anyone know of a plumber in the Seattle area that can service these and check the installation? This is the first one that our plumber has done. Or perhaps there is someone who could talk with him on the phone, or…? Thanks
Yhis heater requires a minimum flow of .75 gpm or more. If the flow drops below .65 gpm, the burner will go off, making the wwater cool. The instructions tell the installer to purge the system of dirt before installing the unit.
Even so, if there has been some dirt further up the line that could come through, the tubing may have become partially blocked reducing the flow to below minimum. Have this checked out. There are some reasonably priced flow indicators that would show problems in the future. A low restriction dirt-catching filter could help eliminate further problems.
European and Japanese users are used to having the repair company come to disassemble, check, and flush the units on a yearly basis. They do not expect the unit heat exchangers to last more than 5 years, so they trade longevity for energy savings.