Heat pump dryers don't exhaust air to the outside, which saves a lot of energy relative to what is pulled from the house. (The water is either collected in a c

Heat pump dryers don't exhaust air to the outside, which saves a lot of energy relative to what is pulled from the house. (The water is either collected in a container or goes down a drain) For modern top loading washers, the final temperature of the water is restricted by limiting the hot water let in, they don't have a heater.