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Yep . A heat pump is the most efficient although they do make a soft noise. I have had a quality one for 20 years which only draws 10 amp and only recently replaced. Rinnai are making them now in Australia although they require 15 amps as they have a backup element to cover alpine locations and keep the unit from freezing outside. The quantum model has no need for the element due to their design.
The problem is the cheap units made in china to get the Renewable Energy Certificates giving them a bad name and that plumbers are not experienced in them. Better installed and serviced by the manufacturers recommended mechanical tradesman or air con contractors.
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