The Harvey TwinTec Series 4 Water Softener. 2 years Replacement & 10 Years Parts Warranty - regardless of your installer.

BLACK FRIDAY Harvey Water Softener Discount Code. Buy the Harvey TwinTec S4 now for only £1079.99 + 6 Packs of Salt For Free. Free delivery & a 2 year labour & 10 year parts warranty.  

Use code: BLACK for your free salt gift.

Save an extra £70 off our usual price (discount already applied) + 6 packs of salt (worth over £50) for free -simply add this in the “add on” section and use the code at checkout.

Found the Harvey TwinTec Series 4 for 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. Have a plumber install your system and save up to £600 off installation packages. Need help finding an installer? 

Talk to us today on 02031486773 . 

Why Choose a TwinTec System?

The Harvey Twintec S4 is a twin tank system from the UK's most trusted brand - Harvey Water Softener. Once installed this product will remove hard water and limescale from your entire home and is designed to last 10-20 years.

You Should Buy the TwinTec S4 if...

• You have a property with 3 or 4 bathrooms or have a family of 3-8 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 

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

To keep your Harvey water softener performing at its best, a few additional products are worth having on hand:

• Block Salt Packs: You'll need block salt to keep your water softener running smoothly. These are supplied in convenient packs—purchase in bulk to save on costs and reduce the number of reorders.
• Installation Kits: It's important to match the correct installation kit to your plumbing. Installation kits typically come in 15mm or 22mm sizes to suit most UK pipework. Including high-quality connectors and fittings, these kits ensure a simple, hassle-free setup.
• 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 home attendance labour warranty work?

When you purchase your system through us, you benefit from comprehensive warranty coverage: 2 years of on-site (home attendance) labour support and a generous 10-year parts warranty.

Here’s how it works:

In some cases, if there is a clear fault with your system in the first year 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, a qualified manufacturer service technician will visit your home, diagnose the issue, and carry out the necessary repairs—or if needed, replace the unit—right then and there. There’s no hassle of being referred to an unfamiliar third-party or local tradesperson; your warranty service is managed directly by the manufacturer’s own experts, ensuring reliable support and a quick resolution.

This home attendance warranty covers most types of faults, from operational issues to repairs involving key components. And remember, this applies to systems located within covered London postcodes. Want to check if your address qualifies? Head over to our postcode coverage page or ring us at 02031486773 —we’re always happy to help clarify your coverage and point you in the right direction.

Why Choose a Manufacturer’s Service Team for Warranty Repairs?

Being a part of Harvey Water Softeners, we have access to a direct service team. Opting for our warranty and service team brings peace of mind you simply can’t get with a random local plumber.

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. Of all models - get the best value for money with the Harvey TwinTec S4. Find out more in this Harvey Water Softener comparison. 

 exact same specification as the Harvey Ac water softener.

The Harvey Crown Water Softener Vs the TwinTec S4

When comparing the Harvey Crown and TwinTec water softener - you'll find big differences in efficiency, flow rate and the technology used. You an find out more in our Harvey Crown comparison. With the TwinTec model you'll get:

• A 40% higher flow rate and performance - meaning no pressure loss.
• 26% increase in water efficiency - 26% less water used during regeneration.
• 15% increase in salt efficiency and 15% less salt used.
• Lower running costs overall.
• A 10 year warranty & guarantee vs only 1-5 years for the crown water softener.
• A water softener that lasts longer, uses the latest technology & costs less to run.

Harvey Water Softener Price

A Harvey Water Softener price generally depends on a few things including the model you're purchasing, warranty and the retailer. 

The TwinTec Series 4 water softener comes has an RRP of £1450, right now our systems are on sale for £1079.99 - meaning you'll get the best quality product available at the best harvey water softener price. Don't pay more than you have to. 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 or view our referral list.

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.