Power too low, and the water never gets hot enough.
Too big, and you overpay on the unit and your wiring.
Picking the right kW is simple once you know the one rule below.
emperature rise = the hot water you want minus your incoming cold water.
That is why the same shower needs different power in different countries.
Warm-region water enters at ~25°C; cold-region water can be as low as 5°C — and that gap can double the kW you need.
Sizing by Region
Tropical / hot (~22–28°C) — SE Asia, Middle East, Brazil, southern India: A single shower runs on 5–6 kW; a sink needs just 3–4 kW.
Warm / mild (~18–22°C) — southern China, Mexico, Mediterranean Europe, southern USA: Plan for 6–8 kW per shower.
Temperate (~10–18°C) — central & northern China, central Europe, most of the USA: A comfortable shower needs 8–11 kW.
Cold (~3–10°C) — Canada, northern Europe, Russia, northern USA in winter: Expect 11 kW and up; whole-home use may need multiple units.
A 7 kW unit praised in Thailand may disappoint in Germany — the reviewer's water was simply warmer.
Always check your own region's winter water temperature, and size up slightly for the coldest month.
Why Anlabeier Makes It Easy
Anlabeier offers tankless heaters across a wide power range, each with clear power specs.
So you can match your home — and your climate — with confidence, backed by real safety protection and precise temperature control.
Conclusion
Count your outlets, check your winter inlet temperature, match the kW.
Every shower feels exactly the way it should.
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