Desalination Systems
Rainman Watermaker
Trusted marine watermaker
- 8.6/10 How we scored
- $4,000–$6,000 Checked Jun 2026; not a promise
- Boats, yachts, coastal off-grid homes
Marketplace prices change often — verify the latest price before buying.
Evidence
| Format | Desalination |
|---|---|
| Listed output / capacity | ~37–140 L/hour (by model) |
| Install | Not listed by seller |
| Seller-listed certification | None listed by seller |
| Replacement interval | Not listed by seller |
| Price band | $5,000+ (seller's listed price: $4,000–$6,000) |
| What we did not test | HU did not lab-test this unit. No contaminant-reduction, output, or durability result on this page is an HU measurement. |
Our review
Rainman is one of the most respected names in marine desalination, valued for watermakers that are genuinely portable and offered in AC, DC, and petrol versions to suit any vessel or off-grid site.
Output scales from modest to substantial depending on model, and the modular design lets you stow the unit when not in use. For boats and coastal homes it's a dependable freshwater source.
Pros
- Reliable, trusted brand among sailors
- Flexible power options including petrol
- Modular design stows away when not in use
Limits
- High upfront cost
- Energy-intensive operation
The HU recommendation
Our pick for marine and coastal off-grid use. Choose the power option (AC/DC/petrol) that matches your existing setup to avoid extra infrastructure.
Accessories
Bottle & accessory
HM Digital TDS-EZ Water Tester8.5/10 HU score · ~$15 listed
ReferralEditor's referral. We may earn a commission; the seller fulfills the order. How we make money · Disclosure
- Universal 10" Sediment Pre-Filter (6-Pack)
Replacement filter
Universal 10" Sediment Pre-Filter (6-Pack)8.3/10 HU score · ~$25 (6-pack) listed
ReferralEditor's referral. We may earn a commission; the seller fulfills the order. How we make money · Disclosure
- Spout Always Fresh Pitcher
Bottle & accessory
Spout Always Fresh Pitcher9/10 HU score · $99 listed
ReferralEditor's referral. We may earn a commission; the seller fulfills the order. How we make money · Disclosure
Compare this
Compare all three in a table- Rainman Watermaker
- Katadyn Survivor 35 Desalinator
Desalination
Katadyn Survivor 35 Desalinator8.7/10 HU score · $2,000–$2,600 listed
ReferralEditor's referral. We may earn a commission; the seller fulfills the order. How we make money · Disclosure
- SeawaterPro DIY Watermaker
Sources
- Rainman manufacturer documentation · specifications as listed by the seller; HU did not independently verify
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