BWT CubIQ installation: compact softening, WS 555 and BWT AQA drink Pro 20 context

Installing BWT’s split kitchen water system

The final plan is now complete.

▫️Large white filter housing | The first line of defence, intercepting sediment, rust and residual chlorine to protect the softener and integrated purifier-heater downstream and extend filter life.

▫️BWT under-sink softener | Its compact body fits beneath the counter. Softened water helps prevent dry-feeling skin when showering, keeps clothes and fabrics softer, and protects water heaters and shower fittings from limescale.

▫️BWT integrated purifier-heater | It combines drinking water and instant heating, with multiple temperature settings for tea, formula and warm water on demand. It also produces strontium-mineralised water, without needing a separate countertop water dispenser.

Water-routing logic: the large pre-filter comes first, then the supply splits into two lines.

One line supplies softened water to whole-home washing and water-using appliances; the other feeds the integrated purifier-heater for drinking and hot water in the kitchen.

It suits a finished apartment because the pipework does not need major changes. The space beneath the counter is planned neatly instead of becoming cluttered, and IoT connectivity lets you monitor water use at any time.

💡Water-treatment approach: coarse filtration first, softening next, and final drinking-water purification last—a single system for household water and drinking water.

Video transcript

The BWT softener and purifier-heater

Today, we're here to install the BWT Vienna water softener and integrated purifier and heater. This is the integrated purifier and heater. It contains strontium-rich minerals, which are said to give the water a great taste. This is the water softener. It's compact enough to fit under the cabinets. The two units can also be connected intelligently. The installer is helping me remove the old water purifier.

Finding space around the sink plumbing

We've run into a problem here. The installer says there's not enough space underneath because of the drainpipes and water manifold, so we need to figure out the best way to install everything.

Routing the purifier-heater and softener

In the end, we decided to put the integrated purifier and heater in the narrow cabinet on the right and cut a hole in the back panel. We'll cut a hole under the sink for the water softener. The installer is starting to cut the holes. We can finally start installing the integrated purifier and heater. The installer cleaned the floor for me. The service has been so thorough.

Fitting the compact softener beneath the sink

Now we're installing the water softener. It fits perfectly under the sink. Let's take a look—very nice.

Checking the softener’s 48 cm height and 30 cm width

It's only 48 centimeters tall. It's also only about 30 centimeters wide.

Testing room-temperature and locked hot water

This is the faucet for the integrated purifier and heater. Let's test it now. This is room-temperature water. The water flow is quite strong. For warm water, you first need to disable the child lock. Now let's try the hot water.

[Text: 50°C]

Likewise, we first press the unlock button.

When the compact units need cabinet cutting

The unit is actually very small. Unless the space under your cabinets is particularly cramped, it can be installed directly without any cutting. The installer was very meticulous with the modifications and cleanup. The service was excellent.

Adding the BWT 10-inch pre-filter

For pre-filtration, I chose BWT's 10-inch Big White filter housing. I plan to install it in the water-meter room. In addition to pre-filtration, its coconut-shell activated carbon can also provide some whole-house water-purification functionality. Let's see how it performs.

Before You Buy

Models in your region

The installation account shows a BWT under-sink softener and an unnamed integrated purifier-heater in a Chinese kitchen. For UK readers, BWT WS 555 is a same-brand softener rather than a confirmed CubIQ equivalent, while BWT AQA drink Pro 20 is a related drinking-water dispenser rather than the same purifier-heater. The source does not establish the installed purifier's full model, cartridge, plumbing or drinking-water test results, so these comparisons provide buying context rather than proof that the UK products match the demonstrated hardware.

Model in this review	Related regional model	What to know
BWT CubIQ	BWT WS 555 (UK)	The source installation uses a compact BWT under-sink softener, while BWT WS 555 is the documented UK same-brand comparison, not an identical regional version. WS 555 measures 270 × 480 × 602 mm and uses UK 22 mm hose/valve fittings with 3/4-inch BSP connections, so check cabinet space and plumbing before treating the installation dimensions as transferable.
BWT integrated purifier-heater, Chinese model unspecified	BWT AQA drink Pro 20 (UK)	The source demonstrates an unnamed BWT integrated purifier-heater with temperature controls and a separate drinking-water branch. BWT AQA drink Pro 20 is a related UK dispenser with magnesium mineralisation and ultrafiltration, not a confirmed equivalent; the source does not establish that its strontium mineralisation, under-sink format, IoT functions or temperature range apply.

Model in this review: BWT CubIQ
Related regional model: BWT WS 555 (UK)
What to know: The source installation uses a compact BWT under-sink softener, while BWT WS 555 is the documented UK same-brand comparison, not an identical regional version. WS 555 measures 270 × 480 × 602 mm and uses UK 22 mm hose/valve fittings with 3/4-inch BSP connections, so check cabinet space and plumbing before treating the installation dimensions as transferable.

Model in this review: BWT integrated purifier-heater, Chinese model unspecified
Related regional model: BWT AQA drink Pro 20 (UK)
What to know: The source demonstrates an unnamed BWT integrated purifier-heater with temperature controls and a separate drinking-water branch. BWT AQA drink Pro 20 is a related UK dispenser with magnesium mineralisation and ultrafiltration, not a confirmed equivalent; the source does not establish that its strontium mineralisation, under-sink format, IoT functions or temperature range apply.

A split route keeps softened water separate from drinking water

The installer’s design places a large pre-filter before splitting the supply: one branch serves softened water for washing and water-using appliances, while the other goes to the integrated purifier-heater for kitchen drinking and hot water. That layout matters because a softener should not be treated as proof that water is drinking-safe; the source describes the purifier branch separately but does not provide a laboratory safety test or complete purifier model.

The video shows the installer selecting a BWT 10-inch large white pre-filter with coconut-shell activated carbon and planning it for the water-meter room. The account presents this as providing part of a central filtration function, but it does not identify the filter’s rated contaminants, replacement interval or verified performance.

The compact installation still required cabinet changes

The owner initially found that the area beneath the sink was crowded by drainage pipework and a manifold. The installer therefore placed the integrated purifier-heater in a narrow cabinet to the right, opened a hole in its back panel, and made another opening beneath the sink for the softener. The video later reports the softener at about 48 cm high and 30 cm wide, while the claim that most installations need no cutting applies only when the cabinet is not especially crowded.

For UK buyers, BWT WS 555 is documented at 270 × 480 × 602 mm, measured width × depth × height, and uses a UK hose and valve fitting kit with 3/4-inch BSP connections. Those dimensions and fittings belong to WS 555, not the installed Chinese unit, so cabinet clearance, pipe routing and connection compatibility need to be checked against the exact local model.

The purifier-heater delivered a short installation demonstration, not a long-term test

The installer tested the integrated unit’s tap with room-temperature water and described the flow as strong. Warm water required the child lock to be opened first, and the video displayed 50°C during the hot-water demonstration. The cover image also shows a BWT touch-screen faucet displaying 98°C, but the supplied account does not establish whether that display represents the same operating setting, so it should not be read as a measured performance result.

The source describes the purifier-heater as producing strontium-mineralised water, offering multiple temperatures and connecting through IoT, but the installation does not verify mineral content, filtration performance, drinking-water safety, long-term reliability or app functions. The UK BWT AQA drink Pro 20 page instead documents magnesium mineralisation and ultrafiltration for listed configurations, so buyers should compare cartridges, plumbing and treatment claims rather than assume the two products are regional equivalents.