I tried Liquid Oxygen, but, during the Dolby Vivisol (my oxygen supplier) installation found it did not work for me..
The problems I found were:
-the Dewar, the big storage bottle, had to be stored in my garage which is about 20m away from the house ( this is the limit of my walking distance);
-as stone-UK has said, the filling takes a few minutes standing up pressing the cylinder on to the Dewar (I almost passed out after a minute);
-I use Oxygen At 15 lpm, it was calculated that I would have to refilling every 1.5 hours;
- after refilling the cylinders have to be left to warm up for up to 30 minutes
- once filled, they will start to lose oxygen. So you can't fill on a Monday and store it for use later in the week.
In the end, it was decided that I would be better off having 10 standard cylinders and being able to order an extra 10 in the same week.
Depending on your oxygen needs, some of the latest Portable Oxygen Concentrator's will go up to 5 lpm (pulsed). So may be another possibility, but, suspect you would have to buy privately.
So for me liquid oxygen was not a workable solution. There may be different solutions from other oxygen suppliers, as each part of the country has different companies. I would discus with your oxygen supplier about the physical installation and the use of liquid oxygen, before, they come to install.
Hope this will highlight some things to think about.
Best Wishes, tenter