It is possible, but please think long and hard about doing this. Consider reservoir volume to be the last and final safety of the osmolator, it has a back up float and 10 minute time out, but if all else fails, having a limited volume of water available is a very important safety. I would not under any circumstance want more water available than would be needed for the amount of time I may be away and no more than my system could safely absorb. Extending the wires and pump tubing adds long term complications as well as there is another splice that can fail/corrode and the pump will struggle to prime with the longer run. Basically you would just extend the wire with a length of speaker wire and use a longer length of the tubing, but I would really consider all the potential problems of doing this. From where I sit, I see far more problems over a few years of use with these extended/big reservoir set ups than I do with stock units and a undertank reservoir of say 5-10 gallons.