Category: ,

PS15UK – Luxury Water Softeners PERLA Silk

An excellent choice for homes of up to 6 people. At under 600mm tall, the Perla Silk 15 will still fit into most kitchen cupboards whilst delivering copious amounts of perfectly softened water.

• Stylish design and impressive performance
• Automatic & intelligent regeneration for uninterrupted softened water supply
• Multifunction back-lit display
• Easy to set up and simple to live with
• Brine safety valve for added protection
• Premium ‘monospheric’ resin for maximum softening efficiency


Do you require installation?

Chosen Softener + £360* Fixed Price Installation

(subject to free site survey*)

*Includes installation, installation kit, associated plumbing and salt starter pack. This service is only available in selected areas at this time, please continue to check availability in your area



The price shown is for a standard Installation, our free site survey will confirm whether this is possible or not within your home. Additional cost may be required if non standard installation. Click here for more details

The PS 15UK is part of a compact and concise range of modern appliance like water softeners that bring a wealth of features and benefits to the market; like  symbol driven set up, IOT capability (wi-fi models only) easy connection with the BWT uniconnect connect block and frugal use of salt and water.  All in a well designed and smart cabinet designed and developed for UK homes and plumbing systems.  Each model is easy to install and live with.

Free @ Home Commissioning

is the perfect way to ensure your new Luxury water softener is perfectly set up for you, your home, your lifestyle and your local water conditions. Set up correctly your new Luxury Water softener will adapt to your normal water usage. This ensure that you have copious amounts of silky soft Luxury Water and minimises your water and salt usage. BWT’s Free @ Home Commissioning also provides the perfect opportunity for you to ask any questions.

Model shown PS15UK

Market Leading Warranty

The PS15UK is  supplied with a full 5 year parts and 2 year labour @ home warranty. In the unlikelihood that your new softener should develop an issue  there is no need to worry about getting it back to us, we will come to you. One of our fully trained engineers will soon have your favourite appliance back up and running again and no cost to you.  When your warranty runs out you can simply top it  up for a small fee. Ensuring you’re free to enjoy all the benefits of  luxury water worry free.

Additional information

Number of bathrooms

, ,

Pipe size


Number of people

, , ,

Hot water system

, ,

BWT Perla Silk Type PS15UK
Nominal connection (outside thread) BSP ¾“ (DN 20)
Nominal flow rate in accordance with EN 14743 l/h 1560
Operating pressure (min./max.) bar 1.7 / 5.0
Operating flow range (min./max.) l/min 5 / 50
Maximum flow rate * l/min 80
Quantity of ion-exchange resin l 15
Nominal capacity Litres 2500
Capacity salt reservoir kg 16
Salt consumption per regeneration kg 0.6 – 2.0
Water consumption per regeneration l 105
Protection class IP 51
Water temperature (min./max.) °C 5 /30
Ambient temperature (min./max.) °C 5 /40
Electrical connection V/Hz 230 / 50
Dimensions: Width x depth x height (W x D2 x H) mm 276 x 470 x 596
Connection height (A) / Overflow height (S) mm 415 / 320
Operating weight, approx. kg 50
Fitting Kit mm Hi-Flow: 22mm Valves and Hoses 
*Tested with HiFlow connection – continuous operation at this level may affect softening efficiency


What is Hard Water?

Hard Water is water that contains dissolved hardness minerals above 100 parts per million (PPM). Relative levels of hardness have been establish as Soft Water less than 100PPM, Slightly Hard 100 TO 200 PPM, Hard 300 TO 400 PPM, Very Hard 400 and above.

How Does a Water Softener Work?

BWT Water Softeners work on the ion exchange principle. They work by passing the incoming water supply through the resin bed, that removes all excess minerals and impurities. As a result, the calcium and magnesium cling to the resin beads and are replaced by sodium ions. The resin bed can only capture a certain amount of minerals, and when this limit is reached, the system is regenerated by flushing it with a brine solution. This helps in the removal of calcium deposits and replenishes the resin with sodium ions. Therefore, with water softeners you can easily turn your hard water into softened water.

Can You Drink Softened Water?

There are no real reasons why you cannot drink softened water, for most people it is a matter of choice and lifestyle. However, for those that have installed a water softener, please be mindful that softened water does contain a slight increase in the amount of sodium, the actual amount of which will depend on your local water hardness and is therefore not recommended for people who are on a low sodium diet, for the preparation of baby formula milk, or for areas where the hardness exceeds 390ppm. Please also note in line with guidance an untreated water tap should be available within the property.

Can You Use Water Softener Salt in a Dishwater?

Once you have installed a water softener in your home, it is unlikely that you will need to add extra salt in your dishwasher. Simply change your dishwasher’s internal water softener setting to the off position or alternatively ensure the incoming water hardness setting is at its lowest/softest.

How Much Time Does It take to install a Water Softener System?

The Installation time will depend on where the water softener is going to be installed and the experience of the installer. Given a suitable location with easy access to the necessary services we would expect an experienced installer to allow 3-4 hours. Check out our video on our YouTube channel How to install a BWT Water Softener, where we have explained the installation process.

Are the BWT water softeners Electric Powered?

The WS range softeners use a ‘Plug In’ type transformer. The low voltage system is used to power the electronic control system and the valve during regeneration. The result is a water softener that can be set up to suit your local water conditions and that can adapt to your lifestyle. The electricity used is minimal and the small diameter cable from the transformer can in most cases be easily routed from the socket to the softener.

Perla Silk Brochure
Perla Silk WS Series Comparison Sheet
Perla Silk Operating Manual