Harvey TwinTec S4 vs Infinity Water Softener: Which Is Better?

Curious whether the Harvey TwinTec S4 or the Infinity T4 (often called simply “Infinity Water Softener”) is the better choice for your UK home? You’re in the right place! We compare their regeneration water usage, salt consumption, performance, warranties, and running costs so you can choose with confidence.

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📋 Quick Specs Comparison

Feature	Harvey TwinTec S4	Infinity T4 / Ultra
System Type	Twin‑tank, non‑electric	Twin‑tank, non‑electric
Regen Salt Usage	300 g per regeneration	340 g per regeneration
Regen Water Volume	17 L per cycle	20.5 L per cycle
Regen Duration	~11 minutes	~11 minutes
Max Flow Rate	56 L/min	51 L/min
Salt Format	Standard 4 kg blocks (easy refill)	4 kg block salt
Warranty	10‑year parts	10‑year parts
WRAS Certified	✔ UK approved	✔ UK approved

 

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🔍 In‑Depth Analysis

1. Price

• The Harvey TwinTec S4 is £1124.99 (using.a discount code) and can be found from NE Water Softeners.

• The Infinity Water Softener is a product manufactured by Kinetico - coming with a much larger price tag of around £1600 -1700 (despite the specification not matching up to the Harvey TwinTec).

2. Salt Efficiency

• TwinTec S4 uses 300 g per regen, making it ~12% more efficient than Infinity.

• Infinity uses 340 g, which is still good—but a slightly higher salt usage means it is slightly less efficient than the TwinTec.

3. Water Consumption

• S4 consumes just 17 L per cycle.

• Infinity uses 20.5 L, ~21% more – small in isolation, but adds up over time and again indicates a less efficient system overall (despite the higher price tag).

4. Flow Rate & Performance

• The Harvey S4 offers a higher peak flow (56 L/min vs 51 L/min), better suited to larger homes or multi-bath setups.

• Both systems regenerate in about 11 minutes, ensuring minimal downtime.

5. Salt Convenience

• The S4 uses standard 4 kg block salt, widely available.

• Infinity also uses 4 kg blocks.

6. Warranty & Certification

• Both offer solid 10‑year parts warranties and are WRAS approved, meeting UK safety standards.

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👍 Final Verdict: The Best Water Softener 2025

Harvey TwinTec S4 vs Infinity Water Softener: Which Is Better for your home?

• **Choose the Harvey TwinTec S4 for the best rated water softener of 2025 and if you want best price plus value for money with a higher efficiency and higher flow rates.

• The Infinity T4 is not a bad choice, but overpriced and only locally available offline - with a very similar specification to the Harvey Twintec.

📌 Both systems offer non-electric, demand-driven regeneration for soft water 24/7 without spikes in running costs.