We have found a slight issue with the modern Instant Hot Water Heater, single handle shower valves, and a well system. Because the pressure on the system isn't high enough, it is hard to maintain the water temp. What we found out is that the water heater will shut off if you try to bring the temp into a normal range. If we had a two handle system, we could leave the hot on enough to keep the water heater running, and adjust the temp with the cold. Just wondered if anyone else has experienced the same issue; or if the experts have any other suggestions.