Instructions for setting the temperature in the Fallen Leaf hot water heaters.
Although some manufacturers set water heater thermostats at 140ºF, most households usually only require them set at 120ºF. Water heated at 140ºF also poses a safety hazard - scalding. However, if you have a dishwasher without a booster heater or a hydronic heating system which uses the hot water heater as a heat source, a water temperature within a range of 130ºF to 140ºF may be required for optimum function.
Reducing your water temperature to 120ºF will slow mineral buildup and corrosion in your water heater and pipes. This helps your water heater last longer and operate at its maximum efficiency.
Since our water heaters are the source of heat for our (hydronic) heating systems, they might need to be set at a higher than usual temperature for the heating system to operate effectively. The higher temperature, if required for heating, is not necessary during the the warmer months.
The manual for the hydronic heating systems installed in Falling Leaf does not recommend a specific hot water temperature, but mention that if the water entering the hydronic heat exchanger is at 140ºF it will be at about 120ºF when it leaves the exchanger. You can check the temperature your hot water heater is set to by following the instructions on the right. It should probably be no higher than 130ºF for the summer months. Only increse it for the winter if your heating system seems to run too long, and be very cautious about using a temperature higher than 140ºF. Even 140ºF is dangerous since exposure to 140ºF water can result in dangerous burns (scalding) in just a few seconds.