She isn't going to protect the pipes in her house with a space heater of any format.
The analogy you are using doesn't work.
She wished to heat only herself.
The larger spray pattern of the nozzle would mean the heat is wasted into the surrounding...
And once vaporized it would escape the area as humidity.
The loss of water can range compared to the total... but the loss is an inefficiency.
So while you are spraying the same amount of water (1500w in our example), you are not getting the full effect of the water toward the purpose (<1500w worth of real world results).
The narrow spray pattern... with less dribble at the nozzle... will be more effective in the process being attempted. It is for all intensive purposes more efficient in the real world application.
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