Cylinder prices converted to per kg, with sources, against five years of making the same hydrogen on site with a 2 kW water electrolysis system, an on-site hydrogen generator sized for up to 1 kg of hydrogen per day. Enter what you use and what you pay for cylinders.
A 47 L high-purity (99.999%) cylinder costs KRW 70,000–110,000 in Korea, which is KRW 163,000–240,000 per kg of hydrogen. The five prices below are the ones we have checked ourselves. A cylinder price has to be on a per-kg basis before it can be compared with making the hydrogen on site.
| Source | KRW/kg | USD/kg | Reference · date checked |
|---|---|---|---|
| Korea, 99.999%, 47L — quotedcalculator default | 163,459 | 120 | Quotation from a Korean specialty-gas supplier (received 2025-04-24), KRW 75,000 per cylinder |
| Korea, 99.999%, 47L — retail | 239,740 | 176 | Phone quote from a Korean specialty-gas retailer (2024-08-12), KRW 110,000 per cylinder |
| Korea, industrial grade | 43,000 | 32 | Assumed · no primary source yet |
| UK, BOC CP grade, 8.8 m³ | 1,312,520 | 964 | BOC list price GBP 564.48 (checked 2026-08-17) |
| UK, BOC CP grade, 880 L | 9,408,859 | 6,913 | BOC list price GBP 404.65 ex VAT (checked 2026-09-03) |
The two UK rows are list prices for small cylinders, so the per-kg figure is an order of magnitude higher. Do not use them as an industrial benchmark. Rows marked as assumed have no primary source yet. Dollar figures convert at USD 1 = KRW 1,361. Prices vary by region, volume and contract, so enter what you actually pay below.
The defaults are a standard example — 3 kg of hydrogen a month (about 6.5 47 L cylinders), high-purity cylinders at $120/kg and electricity at $0.1/kWh. Enter what you use and what you pay, and it recalculates in place. If you already hold a quotation, enter the equipment figure to see the total and the payback point.
One 47 L high-purity cylinder = 0.46 kg
$55 per 47 L cylinder works out at $120/kg
With your quoted figures
Product pricing is provided on quotation. This page contains no prices.
The replacement interval is not a fixed figure. The manual does not state stack life as a fixed number either. The calculation assumes replacement every 16,000 hours. The HXS-2 stack has more than 3,000 hours of cumulative operation.
The defaults convert real Korean purchases into US dollars at USD 1 = KRW 1,361 (September 2026): 47 L high-purity (99.999%) cylinders bought at KRW 70,000–110,000 each, which is $120–180 per kg. We do not yet hold a primary source for US cylinder prices, so enter what you actually pay and the page recalculates in your own figures.
All figures exclude VAT and are stated in the currency you enter. Cylinder prices exclude cylinder rental and delivery. Deionised water and electrolyte are set to zero because sourcing differs by site. The comparison is against cylinder supply; we do not compare against other hydrogen generation equipment. For an actual evaluation we prepare a calculation on your own conditions.