I'm thing of moving the 275 gal. basement oil tank to have more room near the existing boiler and flues. What are the different issues involved? I can see letting it go nearly dry so it gets light enough to remove iron fill and vent pipes and move. Might have to take an outage there (dhw as well as heat). Problem with new location is that exterior grade is on a slope - would have to drill through concrete; I'm assuming that could be done cleanly with the right rental tool. Could install a new tank with piping and tie in, which would require virtually no outage, and could transfer oil from old tank to new. Thing is, a new tank can't be cheap, and I'm not so sure salvage on the old tank would be a lot. Any ideas from those who have done this? Please excuse me if I put this in the wrong forum.