Antoine,
The whole idea is to create hydrogen on demand.
No storage of it.
Just produce what you can consume.
Yes, 6 ltres is easy to make with a drycell type.
Use like 130 wats per litre.
For the infrared, i used 100watt resources.
Nothing extra ordinary happend.
But you might be right on heating water up.
Sadly i do not have so much time left anymore to try.