There is no doubt that the performance of 110v machines is unimpressive compared with 220/240v units. Heating times are quite long as with a usual 16 amps/ 110v supply the available power is limited, as it is restricted to a maximum sized boiler element of 1500watts.
In some countries where 110v is the standard supply, or in some Industries where the use of 110v for portable electrical devices are compulsory for Health and Safety reasons then Duplex supply 110v machines to special order. Using automatic refilling in combination with 110v power is not particularly advantageous so Duplex 110v machines use the single fill method in order to achieve maximum performance, albeit at the expense of longer downtime between refills.
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