Shop the Harvey TwinTec S4 now for only £1124.00 with discount code.

Free delivery & a 2 year labour & 10 year parts warranty.

Use code: HARVEY .

Save off RRP with the discount code.

Found a cheaper price online? We have a price match guarantee & pride ourselves on giving you the best price. We now also have buy now pay later options available.

As an exclusive & verified #1 Harvey online dealer our warranty is valid - regardless of your installer. Need help finding an installer?

Talk to us today on 02031486773 .

Why Choose a TwinTec Softener?

The Harvey Twintec S4 is a twin tank system designed and manufactured by the UK's leading brand - Harvey Water Softener. When deciding on a model - the TwinTec gives the best specification for the best price and is guarantee to last 10-20 years.

You Should Buy the TwinTec S4 if...

You have a property with 2, 3 or 4 bathrooms or have a family of 2-8 people.
You have limed space underneath your kitchen sink.
You are looking for a softener that will last 10-20 years.
You need to remove hard water & limescale from your home.

The TwinTec Series 4 Specification

Click here to view the Harvey S4 Brochure PDF

General Specification

Type of System: Twin tank, non-electric, block salt fed system.

Dimensions: 490mm high and 205mm wide with a depth of 440mm.

Efficiency: regeneration water volume of 17L with a time of 11 mins.

Warranty: 10 years parts and 2 years labour.

Max Flow Rate: 56L/min

Max Pressure: 10bar

Salt Usage: 300g per regeneration

Key Features:

Small & Compact Size: the smallest twin tank softener that fits easily underneath your kitchen sink.
Twin Tank Design: designed to deliver soft water 24/7.
Non-Electric & Automatic: no timers or controls needed.
A 2 year replacement and 10 year parts warranty by NEWS: the S4 has a 10-year warranty for parts and a 2 year replacement warranty.
A Patented Metering System: allowing the softener to measure water usage very accurately – down to measuring two drips per second.
A Nano Technology Ultra Fine Resin: the patented resin of the S4 uses a unique ultra-fine exchange resin for higher flow rates and greater exchange capacity.
Smart Shuttle Metering for Pressure Adaptations: a smart shuttle meter for all different pressure systems including gravity-fed systems, tanks in the loft, combination boilers and high flow cylinders.
High Flow Rate: with a max flow rate of 56 litres per minute, power showers and mega flows are no problem.
Great Efficiency: Uses only 300g of salt per regeneration which requires only 17L of water and takes just 11 minutes.
Tried & Tested Durability: these TwinTec designs are tried and tested for maximum durability & reliability.
Uses Block Salt- the reverse osmosis system is powered by a brine solution.

Recommended Accessories for Your Harvey Water Softener

When purchasing this system we suggest checking you have the below accessories to make sure you have a seamless set up and easy installation:

Block Salt Packs: You'll need block salt to keep your water softener running and for the removal hard water ions. Each pack comes with 2 blocks of salt. An average use of salt is usually 1 block per person per month.
Installation Kits: It's important to match the correct installation kit to your plumbing. Installation kits typically come in 15mm or 22mm sizes. Including high-quality connectors and fittings, these kits ensure a simple, hassle-free setup. Click here to view in more detail.
Pressure Reducing Valve: In few cases, if the home's water pressure is too high, a pressure reducing valve may be necessary.

How does the warranty work?

When you purchase your system through us, you benefit from comprehensive warranty coverage: 2 years of labour support (to find out more about our labour warranty get in touch) and a generous 10-year parts warranty.

Here’s how it works:

In the first 6 months, if there is a clear fault with your system we will arrange a pick up of your old unit and send you a brand new one - without a home visit being necessary. In other cases where your water softener develops a fault during the first two years and this fault is harder to diagnose over the phone - we will arrange to diagnose the issue ourselves, and carry out the necessary repairs. There’s no hassle of being referred to an unfamiliar third-party or local tradesperson, ensuring reliable support and a quick resolution.

This applies to systems located across the UK. If you have any issues feel free to ring us at 02031486773 —we’re always happy to help clarify your coverage and point you in the right direction.

Harvey Water Softener Model Comparison

The Harvey MiniMax Vs TwinTec S4

When Comparing the TwinTec series 4 to other water softeners such as the MiniMax and the Harvey Arc - you'll find the same technical specifications such as flow rate, pressure and efficiency. Find out more in this Harvey Water Softener comparison.

exact same specification as the Harvey Ac water softener.

Harvey Water Softener Price

A Harvey Water Softener price generally depends on the model you are purchasing and the condition of the system.

Our TwinTec S4 systems are on sale for £1124.00. We now also have a buy now pay later option available to help spread the Harvey water softener cost.

Water Softener Installation

A water softener is installed next to the stop tap, which is usually underneath the kitchen sink. This can be easily carried out by a plumber and you will usually require an installation kit. We offer installations in select areas in the UK, we also have a list of plumber referrals that can help!

Need help finding an engineer for your installation?

Talk to us today on 02031486773 and may be able to help you.

For Installation Manual Click Here

WRAS Approval

This water softener is fully approved by the UK Water Regulations Advisory Scheme WRAS, ensuring it meets the highest UK water safety standards. You can have confidence that it complies with all relevant regulations for installation and operation within your home.

Featured Products Water Treatment & Filters

The Harvey TwinTec Series 4 Water Softener. 2 years Labour or Replacement & 10 Years Parts Warranty.

Refurbished Harvey TwinTec S4 Water Softener