I had a NORITZ tankless water heater installed six months ago after doing an addition to my house. The original piping (copper) is 1/2" but the piping to the new master bath is 3/4".
Recently, the plumber installed the remote thermostat, and ever since the system shuts off periodically. Namely in the middle of showers in the new bathroom. But also, it seems (and always has seemed) that the water in the showers must be full-on for it to be hot enough.
I can't say what the base unit was originally set at, but the remote is set at 125 degrees, and when it goes out, we get a flashing 90 on the readout, then must restart the system. Very annoying in the middle of EVERY shower in the new bathroom.
I have heard that this may have something to do with gas pressure (and that the RENNAI systems don't have this problem?). My fear is that my plumber is just not experienced enough with these systems, and that the Noritz rep may be unwilling ot fess up to the fact that his system is not right for our gas pressure (if it is indeed the gas).
FYI: We have three bathrooms, and a front-load washing washer, and we live in Los Angeles. Any help much appreciated!