BWT Perla Silk — Engineer's Review
BWT's award-winning Perla Silk is one of the most efficient and space-conscious water softeners on the market. Here's our honest assessment after installing it across prime London homes.
RARE Verdict: Excellent — with one caveat
The Perla Silk is an outstanding water softener — efficient, quiet, compact and well-designed. For London flats and apartments where space and noise are primary concerns, it's often our first recommendation. The one caveat: if you want an integrated mineralised drinking water supply at your kitchen tap, you'll need to step up to the BWT OnePipe Pearlwater system. The Perla Silk softens your water — it doesn't add the premium drinking water outlet.
Technical Specifications
Pros
Cons
Ideal for flats & apartments
Compact footprint and whisper-quiet regeneration make it the go-to choice where space and sound are a concern.
Best-in-class efficiency
BioTec+ resin uses up to 40% less salt and water per regeneration cycle — significant savings over 10+ years.
Award-winning design
Slim modern cabinet with AquaLite display — at home in a high-end London kitchen or utility room.
Perla Silk vs OnePipe Pearlwater — Which BWT Should You Choose?
Both are BWT systems, but they serve different needs. The Perla Silk is a premium softener — it produces genuinely soft water throughout your home at exceptional efficiency. The OnePipe Pearlwater does everything the Perla Silk does, plus adds a dedicated mineralised (PearlSilk) drinking water outlet at your kitchen tap from the same single pipeline.
If you're happy to use a separate unsoftened tap for drinking — or you're installing a reverse osmosis system alongside — the Perla Silk is the right choice. If you want one elegant solution that handles both soft water throughout and premium drinking water at the tap, choose the OnePipe Pearlwater.
Compare BWT vs HarveyFrequently Asked Questions
How much does a BWT Perla Silk cost to install in London?
Supply and professional installation of a BWT Perla Silk in London typically costs £2,800–£3,200 + VAT, depending on the property, access and any additional pipework required. RARE provides fixed-price quotes after a free site survey.
Is the BWT Perla Silk suitable for a London apartment?
Yes — the Perla Silk is one of our top picks for London flats and apartments. Its slim footprint fits tight utility cupboards and its whisper-quiet regeneration (designed for overnight operation) will not disturb neighbours in shared buildings.
What is the difference between BWT Perla Silk and BWT OnePipe Pearlwater?
Both are BWT ion-exchange softeners. The Perla Silk produces soft water throughout your home. The OnePipe Pearlwater does the same, but additionally provides a separate mineralised (PearlSilk) drinking water outlet at your kitchen tap from the same single pipeline — without the need for a separate unsoftened tap.
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Reviewed by RARE Plumbing London Engineering Team
Gas Safe Registered Heating Engineers · Reviewed 25 August 2026
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