[VeniVidiVici]

Shutting off my electric water heater on the warmest days when there is a high electric load due to air conditioners has never affected my comfort level to any perceptible degree.

How much do you think your hot water heater actually runs on hot days? Probably next to nothing.

[nascarnation]

Well since the basement temp is always about 67F, I assume it runs pretty much the same every day.

[Alaska Wolf]

How much do you think your hot water heater actually runs on hot days?

That would depend on the amount of hot water used, the temperature of the water entering the hot water tank and the temperature set on the thermostat. Most homes have mixer valves installed in the plumbing system so every time you flush a toilet you use a certain amount of hot water.