I have 20 gallons of water (salt water, but this might be irrelevant). These 20 gallons have a heater that maintains a minimum of 78º F.
With the increasing temperatures during summer, the water during the day can go up to 80ºF. (Gain of 2 aprox).
My question is: If the heater was set to maintain a minimum of 80ºF would the increase in the room temperature affect the 20 gallons in the same way? Would it go up to 82ºF or would it stay the same since the difference with room temperature is less?