Can you lie it down to transport it

The tank is glass lined and has little strength in that direction.

It's your call: Distance, condition of the roads, boxed, on a flat surface, immobile (tied securely) would all come into play.

Can you lie it down to transport it

I'm going to hafta agree with KISS on this. It depends on whether you stand it up and strap it n or lay it down. Much less shock if you stand it up. Although when I transport a boxed heater out to be replaced I lay it down in the bed of the truck. Will this heater be boxed? Answer KISSes questions and we'll get back to you. Good luck, Tom