It all depends on your demand. If you want faster recovery time, a higher capacity unit will heat more water faster. The behavior of the unit can be twisted no matter how the unit was designed originally. A dehumidifier has been done, as well as a run-of-the-mill 5000 btu window a/c unit. Both are in operation today. According to their respective hackers, they both do the job cheaper than they did before as electric units.
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