Which Water Heater to Buy in Thailand: 3,500 W or 4,500 W

Updated 6 Nov 2026

Choose the right wattage for your home, then compare popular Stiebel Eltron, Panasonic, Rinnai and MEX models.

Most home shower heaters are 3,500 W or 4,500 W. Higher wattage heats better at stronger flow, but your wiring and breaker must support it, so have an electrician check before installing.

Popular models

STIEBEL ELTRON

WS 45E

4,500 W

from ฿3,690 · 9,000+ sold

See price at Shopee

Panasonic

DH-3VL1TW

3,500 W

from ฿2,444 · 4,000+ sold

See price at Shopee

RINNAI

SENTO 350

3,500 W

from ฿5,590

See price at Thai Watsadu

MEX

COCO 350

3,500 W

from ฿3,590

See price at Thai Watsadu

Details from the listings in Nov 2026, not our own testing. The listing shows the current price.

Before buying, check earthing and a residual-current breaker.

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