Home Improvement → Re: Not enough hot water - house has 2 WH connected together.

You are wrong.

"Most adults will suffer third-degree burns if exposed to 150 degree water for two seconds. Burns will also occur with a six-second exposure to 140 degree water or with a thirty second exposure to 130 degree water. Even if the temperature is 120 degrees, a five minute exposure could result in third-degree burns."
»www.accuratebuilding.com ··· aph.html

By the way - learn to use the correct reply button.

Third degree burns are very severe. According to Wikipedia they can result in "Scarring, contractures, amputation" »en.wikipedia.org/wiki/Burn

The point is even a 1st or 2nd degree burn is very painful and should be avoided.

The same site you quotes says
"Each year, approximately 3,800 injuries and 34 deaths occur in the home due to scalding from excessively hot tap water. The majority of these accidents involve the elderly and children under the age of five."

and

"The CPSC notes that a thermostat setting of 120 degrees Fahrenheit (49 degrees Celsius) may be necessary for residential water heaters to reduce or eliminate the risk of most tap water scald injuries. Consumers should consider lowering the thermostat to the lowest settings that will satisfy hot water needs for all clothing and dish washing machines."

Reduce or eliminate. That contradicts what the all-knowing Xcal said, which was it would cause third degree burns "a few seconds later".

I was burned in the Navy back in 1978. Third degree, on my leg. Wanna see it?

For my house, that's 135 degrees.