Rinnai RL75i Tankless Water Heater

[AndrewS]

I have a recurring problem with hot water temperature regulation. While showering, the water temperature will fluctuate. Once the water is to temperature after a few minutes the temperature will go down to Luke warm for a minute then hotter than original temperature then back to starting temperature. This will have 2-3 times during a 15 minute shower. It is quite aggravating. Any suggestions on this?

 

[Diehard]

I have a recurring problem with hot water temperature regulation. While showering, the water temperature will fluctuate. Once the water is to temperature after a few minutes the temperature will go down to Luke warm for a minute then hotter than original temperature then back to starting temperature. This will have 2-3 times during a 15 minute shower. It is quite aggravating. Any suggestions on this?

I suggest you call the manufacturer and see what they have to offer.

 

[RS]

We had neighbors that installed a tankless water heater, never could get it to work satisfactorily. They eventually put a small tank type heater in series after the tankless.