Youcan trust me. 110v tubs are less efficient, and cost more over time. Those two heaters would heat the hot tub in the same amount of time. The 110 heater would have to be about double the size of the 240v. 5.5 kw / 110v = 50amp 5.5kw / 240v = 22amp. a 110v heater doesn't run at 5.5kw, it runs at 1.5kw. Ifyour company's devices are rated 110V or 220V, that is likely a conscious decision so that they can be used +-10% in many areas. 220 - 10% = 192 which covers 208V input, even down to 200V (Japan) and 220 + 10% = 242V which covers 230 or 240V input. 110V is a similar compromise between 100V (japan) and 120V (North America).

Whatare the differences between 220VAC, 230VAC and 240VAC Mains Supplies and what voltage equipment should I use? For many years, mainland Western

xXXe.
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    • 220v vs 230v vs 240v