Where the research sits, not where the marketing usually does.

1,500 ml/min sits within the range the published hydrogen-inhalation research has explored. The Gen, at 900 ml/min, is a credible starting point. The Medic, at 3,000 ml/min, is for specific protocols. For daily use, at standard session lengths, the Nova is where the science sits — and where most people settle.

Most Nova users run sessions of 30 to 60 minutes once daily. At 1,500 ml/min, tissue saturation is reached comparatively quickly, so a 30-minute session is enough for most people. An hour gives the accumulation time the research tends to describe. Longer sessions are fine; the machine is rated for continuous run up to 8 hours.

Three things, honestly. Flow rate — most sub-£1,000 devices deliver 150 to 450 ml/min, which is well below the range the research has explored. Membrane provenance — the Nova uses a USA-manufactured N117 membrane, the same one used in published studies. And UK support — our team handles warranty directly, no grey-market complications, no international returns.

For most people, no. The Medic makes sense if you're running very short sessions (15 minutes or less) and need to reach saturation quickly, or if you're building a longevity protocol with specific higher-dose targets. For a standard daily practice, the Nova delivers the benefit at nearly half the price. We'd rather you bought the right machine than the biggest one.

Distilled or deionised water only. Tap water contains minerals that shorten the life of the electrolyzer considerably. Supermarkets stock distilled water at roughly £1 per litre; a single tank holds 2.6 litres and runs for several sessions. The TDS pen included in the box lets you confirm the water is pure before each refill.

No. The Hydro Nova runs at 20 decibels — quieter than a whisper, quieter than a laptop fan. Most users place it on a side table during a session and forget it is running.

The machine, three silicone cannulas, a pre-fitted filter, a TDS water-quality pen, the UK power lead, and the printed manual. Delivery is free, next working day if ordered by 2pm. The 2-year UK warranty is registered automatically — nothing to post back. If you'd like to read the full manual before ordering, our UK team will email a copy on request.

Yes. We offer Klarna and Clearpay at checkout, both interest-free. The Hydro Nova works out at around £687 per month over four months with Clearpay, or three monthly payments with Klarna. If you'd rather arrange something different, our UK team can help — just email us.

Email our UK team. We handle warranty directly — no international returns, no grey-market complications, no going through a distributor. If a repair is needed, we arrange collection and cover postage both ways for the first two years.