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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
• Keep HYDROFILL PRO in upright position
• Add de-ionized or distilled water carefully to avoid over-filling the water tank
• Keep HYDROFILL PRO in a ventilated location during operation
• Do not ingest the powder (malic acid) contained in the maintenance kit, keep away from children
• Keep all electrical connections dry at all times

 

WARNING

3. Fully insert the  HYDROSTIK or HYDROSTIK PRO cartridge into the HYDROFILL PRO unit by turning it 

clockwise into the cartridge port until firmly secured. During the insertion process, the green indicator 
light may turn red to indicate a connection (Fig D), but continue turning to make sure the  HYDROSTIK or 
HYDROSTIK PRO is firmly secured (Fig E).  Secure the  HYDROSTIK or HYDROSTIK PRO tightly to the unit, 

but be careful not to apply excessive force.

OPERATION INSTRUCTIONS

1

2

The specifications are subject to change without notice.

HYDROFILL PRO

STATUS INDICATOR LIGHTS

The ridge is the water level

4. While the indicator light is RED, your  HYDROSTIK or HYDROSTIK PRO cartridge is being filled with hydrogen. 
The  HYDROSTIK or HYDROSTIK PRO cartridge is fully charged  when the indicator lights GREEN. When 
completed, disconnect the  HYDROSTIK or HYDROSTIK PRO cartridge from the HYDROFILL PRO (turn 
anti-clockwise to disconnect). 

Note: 1. It will be normal to hear short bursts or puffs during the refilling procedure, due to water 

being purged from the system from time to time.
2. It will be normal to hear the sound of air being released when the  HYDROSTIK or HYDROSTIK PRO is disconnected from the 
HYDROFILL PRO. 

Water tank cover

Status indicator

 HYDROSTIK or 

HYDROSTIK PRO

cartridge port

(

a) 

HYDROFILL PRO unit

Waste water tank

Water tank

5. Disconnect the HYDROFILL PRO from the AC and empty the water tank if you will not use the HYDROFILL 
PRO for more than one week. If more cartridges need to be charged, repeat step 3. 

Stack type

Wate

r input

Proton exchange membrane electrolysis cell

De-ionized 

or dis

ti

lled water  

Dimensions

 (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 

consumption

Approx. 20ml/hr (1.2in /hr) 

Wei

g

ht

1.8K

g ±5% (3.97Lbs ±5%)

99.99

P

u

rit

y

Compatible cartridge

 HYDROSTIK and HYDROSTIK PRO

H

y

dro

g

en 

g

enera

ti

on 

c

apa

c

it

y

  

U

p to 3L/hr (0-183 in /hr)

H

y

dro

g

en o

u

tp

u

t press

u

re 

0

-3.0 MPaG (0-435.11 PSI)

3

Wate

r temperature

10-40°C (50-104°F)

3

1. Open the water tank cover located at the top of the unit (Fig. A). Carefully add de-ionized or distilled 

water

** EXACTLY up to the ridge level inside the water tank as shown below in Fig. B. Close the cover.

WARNING: 
Only use de-ionized 

or distilled water.

Ridge

status indicator light 

will switch from 

green to red

Rated power

≤23W

Re

llin

g

 

ti

me 

f

or 

one cartridge 

Around 4 

hours

 (at 25C ambient temperature) 

Green

on 1 second, off 1 second

System Status

Add water or empty waste water tank

on

 HYDROSTIK or HYDROSTIK PRO cartridge is full

on

 HYDROSTIK or HYDROSTIK PRO cartridge is being filled 

on 1 second, off 3 seconds

Add 

maintenance kit (malic acid)

on 1 second, off 1 second

Waiting to fill  HYDROSTIK or HYDROSTIK PRO cartridge 

Red

connect  HYDROSTIK 
or HYDROSTIK PRO 

until firmly secured

2. Connect the AC-DC adapter to the unit  (Fig. C).
Once plugged in to an AC point, the unit’s status indicator light should start to flash green.

SYSTEM OVERVIEW

The HYDROFILL PRO system uses a proton exchange 
membrane (PEM) electrolyzer to recharge Horizon’s 
HYDROSTIK and HYDROSTIK PRO metal hydride cartridges 
automatically. 

Quiet, safe and convenient hydrogen supply
Compatible with HYDROSTIK 

and HYDROSTIK PRO cartridge 

High hydrogen purity 99.99%
Optional DC solar or wind power supply 
Connects to AC power 

SYSTEM FEATURES

AC-

D

C

 adapt

er (b)

(

b) 

AC-DC adapter 

 (

c) 

Maintenance kit

Fig. A

Fig. B

Fig. C

Fig. D

Fig. E

INCLUDED IN THIS BOX

a. 

HYDROFILL PRO unit

b. AC-DC adapter cord
c. Maintenance kit (malic acid powder)*
d. User Manual

*Additional malic acid powder 

maintenance kits can be purchased 

from Horizon. Contact 

support@horizonfuelcell.com.

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