Currently have a large 315L hot water tank in a really inconvenient location at my house. I've been forced to do some renovation/repair work and am wondering/hoping I'd be able to remove the big tank and replace it with an electric instantaneous system. Took a look at my power box and from what I gather the three black things (fuses I've been told) with the yellow zip ties are my mains coming in. Of which, it seems there are 2 active and 1 neutral? (2 phase power) Here's a few pics: From what I gather, if I had triple phase power I'd expect to see 4 of those black things with zip ties - 3 actives, 1 neutral. The house does also have a fairly large ducted air con system, which I thought would have required 3-phase power. Here's specs of the outdoor unit: I obviously don't plan on doing any type of electrical work, at this stage I'm just wanting to try and identify my options. If I only have 2 phase power: 1. Do 2 phase electric instantaneous hot water systems exist? Are they any good? 2. Is it expensive bringing in a third phase? Does it take a long time to arrange? Any help much appreciated.