Hydrofast W100 Reverse Osmosis Hot Water Purifier

A six-stage RO purifier with no plumbing: fill the 4 L raw-water tank and plug it in. It dispenses at room temperature or heats instantly to seven settings from 45 to 98 °C, and the display shows live TDS and filter life.

~~$379.64~~

5%$359.64

Price with code · Geekbuying · as of 2026-10-09

Code 26BTS01 · 6% off

max $20 · orders over $50 · until 2026-10-31

Copy code & shop Geekbuying

~~$379.64~~5%$359.64Copy code & shop Geekbuying

1Eight settings from ambient to 98 °C

Pick ambient or 45, 55, 65, 75, 85, 92 or 98 °C and it heats on the spot. There are 150, 300 and 500 ml presets plus 15 volume levels from 50 to 999 ml, a child lock and a night light.

The silver purifier filling a mug with hot water

2Six-stage RO with remineralising

Water passes PP, CTO, RO, PCF, mineral and UV stages; the 0.0001 μm RO membrane cuts TDS by up to 95%. The mineral filter adds back minerals such as magnesium and calcium, and a UV lamp sterilises the water.

The 4 L tank and 150, 300 and 500 ml presets

32000 L from one filter set

The pure-to-drain ratio is 3:1, and one filter set handles about 2000 L. The RO filter lasts up to 12 months and the composite filter nine, with a reminder when it’s time to swap.

Key specs

Filtration: PP · CTO · RO · PCF · MIN · UV
Temperatures: Ambient + 45–98 °C
Water tank: 4 L raw · 2 L purified
Power input: 2200 W · AC 220–240 V
Weight: 7.3 kg
Ships from: Poland warehouse

Good pick if

You need water at exact temperatures for formula or tea
Your home can’t take under-sink plumbing

Think twice if

You want chilled water

FAQ

Is there a promo code?

Yes. Enter 26BTS01 at Geekbuying checkout when buying the Hydrofast W100 Reverse Osmosis Hot Water Purifier for 6% off. Conditions: max $20 · orders over $50 · until 2026-10-31.

Which voltage does it need?

It runs on 220–240 V AC and ships from the Poland warehouse. It won’t work on 110 V mains without a transformer.

What’s in the box?

The purifier, an RO filter, a 4-in-1 composite filter, the manual, a quick-start guide and an interface guide.