that has been claimed. I’ve not seen it. I also don’t understand why anyone would build them that way.
what should happen is the heater flows the same amount of water, and just doesn’t bother heating it. just because it’s already at temp, doesn’t mean the user wants less water. so only moron would engineer the device to reduce flow (imo).
they should certainly stop heating when the don’t sense flow…but reducing flow when the input temp is approaching set point makes no sense given how these things are generally supposed to be used.
I can see some utility in throttling flow if input is ABOVE the set point, but actually achieving that in use seems unlikely, so I wouldn’t actually expect it to be built in.