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HHO ‘dry cell’ kits use battery power to split water into hydrogen and oxygen gas, which is then fed into the engine’s intake with the idea that burning a little hydrogen alongside gasoline improves fuel economy. Independent physics and the EPA’s own review process point the other way: splitting water takes real electrical energy from the alternator, and no HHO kit manufacturer has ever submitted the testing required to get an EPA-recognized mileage claim approved. Treat any ‘boost your MPG’ marketing on these kits with real skepticism — what follows are the physical kits people actually buy to experiment with dry-cell electrolysis, not a mileage guarantee.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | LaBella’s Enterprises HHO Dry Cell Kit Pro 1 | $180-$260 | Amazon |
| 2 | LaBella’s Enterprises HHO Dry Cell Kit Pro 2 (Twin Cell) | $280-$380 | Amazon |
| 3 | 16-Plate HHO Dry Cell Kit (Stainless Hydrogen Generator) | $90-$160 | Amazon · eBay |
| 4 | 21-Plate HHO Dry Cell Kit | $120-$200 | Amazon · eBay |
| 5 | 11-Plate HHO Dry Cell Kit (Compact) | $60-$100 | Amazon |
| 6 | HHO Dry Cell Kit with 30 Amp PWM and 2-Quart Tank | $110-$180 | Amazon |
The picks, in detail
LaBella’s Enterprises HHO Dry Cell Kit Pro 1
A single dry-cell hydrogen generator kit with a 2-quart bubbler tank and 10 ft. of hose, from a Louisiana-based HHO specialist that’s built these kits for over two decades.
- Single stainless dry-cell body
- 2-quart bubbler/reservoir tank included
- 10 ft. hose and fittings
- BBB-rated seller
- Established seller with real phone support
- Complete kit — no separate tank/hose purchase needed
- Pricier than generic imported kits
- No independent dyno or mileage data provided with purchase
LaBella’s Enterprises HHO Dry Cell Kit Pro 2 (Twin Cell)
The twin-cell step up from the Pro 1, running two dry cells off one kit for builders who want more plate surface area.
- Twin dry-cell design
- Includes tank, hose, and mounting hardware
- Compatible with LaBella’s PWM controllers
- More plate surface area than single-cell kits
- Same established seller and support
- Draws more current, so a PWM controller is effectively required
- Higher cost and more complex install than Pro 1
16-Plate HHO Dry Cell Kit (Stainless Hydrogen Generator)
The most commonly listed configuration on eBay — a 16-plate stainless dry cell sized between entry-level and heavy-duty truck builds.
- 16 stainless steel plates
- Acrylic/PVC dry-cell housing
- Gasket-sealed body
- Wiring leads included
- Widely available from multiple sellers
- Moderate price for the plate count
- Build quality varies a lot by seller
- No standardized testing across listings
21-Plate HHO Dry Cell Kit
A larger-format dry cell for builders targeting bigger engines, with more plate surface area than the 16-plate version.
- 21 stainless steel plates
- Larger housing than 16-plate kits
- Gasket-sealed body
- Compatible with standard PWM controllers
- More hydrogen output potential than smaller kits
- Draws significantly more alternator current
- Larger footprint is harder to mount in tight engine bays
11-Plate HHO Dry Cell Kit (Compact)
The compact entry point into dry-cell builds, aimed at smaller engines and first-time builders.
- 11 stainless steel plates
- Compact housing
- Basic wiring kit included
- Lower current draw than 16/21-plate kits
- Cheapest way to try a dry-cell build
- Easier to fit in small engine bays
- Least hydrogen output of the plate-count kits
- Same lack of independent efficiency evidence as larger kits
HHO Dry Cell Kit with 30 Amp PWM and 2-Quart Tank
A bundled kit pairing a dry cell with a 30-amp pulse-width modulator and a 2-quart bubbler tank, for buyers who don’t want to source the PWM controller separately.
- Dry cell plus 30A PWM controller
- 2-quart bubbler tank included
- Pre-matched components
- Wiring harness included
- Simpler single-purchase setup for beginners
- PWM lets you limit/monitor current draw
- Bundled PWM is entry-level, not a premium controller
- Same unverified mileage claims as any dry-cell kit
Buying tips
- Whatever you read about mileage gains, budget for the kit purely as an experiment — the EPA has never approved an HHO device for a fuel-economy claim, and no manufacturer has submitted one for testing.
- A PWM controller isn’t optional if you value your alternator — running a dry cell directly off battery voltage draws far more current than it’s rated for.
- Check plate material (316L stainless is the standard) — cheap imported plates corrode fast in the electrolyte solution.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.