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How is hydrogen stored?

Hydrogen is stored in small cartridges (HYDROSTIK or HYDROSTIK PRO) at low pressure. When refueling, 

hydrogen gas is sent into the cartridge at high pressure, and adsorbed onto the surface area of a special metal 

alloy which is contained inside the cartridges, thus becoming a solid (hydride). When connected to the fuel 

cell, the  HYDROSTIK or HYDROSTIK PRO cartridges slowly release hydrogen using a heat exchange process 

with the ambient temperature.

How can I refill  HYDROSTIK or HYDROSTIK PRO cartri

dges with hydrogen?

Add water into the unit’s water tank, connect the AC-DC adapter and insert a  HYDROSTIK or HYDROSTIK PRO 

cartridge. The HYDROFILL PRO will split water into hydrogen and oxygen, sending hydrogen into the  

HYDROSTIK or HYDROSTIK PRO cartridge. It will take around

 4-6.5 hours to fully fill a  HYDROSTIK or 

What is the purity level of the hydrogen produced by the HYDROFILL PRO

?

The purity of the hydrogen produced by the HYDROFILL PRO is 99.99%. The metal hydrides contained in the 

cartridge first adsorb hydrogen, then release it at a higher purity into the fuel cell.

When do I need to add water to the water tank?

When should I empty the drainage tank?

When the waste tank is full, pour waste water out and refill the water tank. 

Empty the water tank if you will not use the HYDROFILL PRO within one hour. Add fresh 

water.

 to the water tank before use again.

FREQUENTLY ASKED QUESTIONS

The LED light alternates between red for 1 second and off for 3 seconds.

SOLUTION

:  Try to add 40°C to 70°C water into the water tank.

The LED light alternates between red for 1 second and off for 1 second. 

SOLUTION

: Check the water level of the water tank and waste water tank is correct. Either add 

water to the water tank or remove water from the waste water tank as required.

3

4.  

5. 

4

6. 

T

SOLUTION A

:

 

y.

SOLUTION B

: Check the water temperature (see 4. SOLUTION)

SOLUTION A
SOLUTION B

: Disconnect the HYDROSTIK or HYDROSTIK PRO and connect it to a fuel cell product to 

confirm there is hydrogen in the cartridge.

Q: 
A: 

Q: 
A: 

Q: 
A: 

2. 

the HYDROFILL PRO.

SOLUTION A:

 Disconnect the  HYDROSTIK or HYDROSTIK PRO and re-connect it again slowly. Make sure the 

 smooth and the  HYDROSTIK or HYDROSTIK PRO is fully inserted into the thread.

SOLUTION B:
SOLUTION C:

 Remove and re-connect the AC-DC adapter.

HydroFill Pro_UM_V1.5_EN

USER MANUAL

SPECIFICATIONS

 Do not tamper with, or disassemble the HYDROFILL PRO

• Keep HYDROFILL PRO away from fire, open flame, or heat sources

• Keep  HYDROSTIK or HYDROSTIK PRO cartridge away from fire, open flame, or heat sources

• Keep HYDROFILL PRO away from children

• Add 

 carefully to avoid over-filling the water tank

W

ARNING

1

HYDROFILL PRO

Water tank cover

Status indicator

 HYDROSTIK or 

HYDROSTIK PRO

cartridge port

(

a) 

HYDROFILL PRO unit

Waste water tank

Water tank

Stack type

Water input

Proton exchange membrane electrolysis cell

De-ionized or dis lled water  

D

i

m

ensions

 (W x D x H)

145 x 153 x 208 mm (5.7 x 6 x 8.2 in)

Input voltage

DC: 10V-19V

Water 

Approx. 20ml/hr (1.2in /hr) 

Weight

1.8Kg ±5% (3.97Lbs ±5%)

99.99% 

P

urity

HYDROSTIK and HYDROSTIK PRO

Hydrogen genera on capacity  

Up to 3L/hr (0-183 in /hr)

Hydrogen output pressure 

0-2.8 MPaG (0-406 PSI)

3

Wate

r temperature

10-40°C (50-104°F)

3

Rated power

≤23W

R

e

fill

ing 

m

f

or one cartridge 

Around 4-6.5 hours (at 25C ambient temperature) 

SYSTEM OVERVIEW

The HYDROFILL PRO system uses a proton exchange 

membrane (PEM) electrolyzer to recharge Horizon’s 

HYDROSTIK and HYDROSTIK PRO metal hydride cartridges 

Quiet, safe and convenient hydrogen supply

and HYDROSTIK PRO cartridge 

High hydrogen purity 99.99%

Connects to AC power 

SYSTEM FEATURES

(

b) 

AC-DC adapter 

 (

c) 

User Manual

INCLUDED IN THIS BOX

a. 

HYDROFILL PRO unit

b. AC-DC adapter cord

c. User Manual

300000221

HYDROFILL PRO
     User Manual

*

One way to check the volume of hydrogen inside a cartridge, is to weigh the  HYDROSTIK or HYDROSTIK PRO before and 

is around 0.9 grams.

Q: 

A: 

Q: 

A: 

Q: 

A: 

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