Hi, this concern seems to be common in Texas. Here is basically how it works. The mixing valve has to mix hot water from the water heater with the water coming in through your fresh water hose. If the temps outside are hot, the water in the pipes will be hot too. [Texas is hot] I have found that while camping in cold areas, I have to turn my valve almost all the way to the hot side. And when camping in hot areas, I have to barely turn it on or it will be too hot. The valve has a plastic sleeve that can be adjusted to give you more, or less hot water, as you turn on the valve. If you plan to always be in a hot area, you might want to adjust it for less hot water from your water heater. In normal weather, 65 to 75 degrees, my handle is in the middle.