OK, so we have a ye olde gravity fed tank in the roof on off-peak 2 electricity. The water pressure in the main bathroom is just fine for us because it's right underneath the tank, but we've got no hot water pressure at all in the new laundry we've built at the back of the house, it's just too far away. So we need a new hot water system with mains pressure. I've been researching and getting quotes but I am just so thoroughly confused.

We would LOVE to go solar but we're on a south facing slope with big trees to the north and EVERY consultant we've spoken to agrees that we don't have enough solar access so that's out unfortunately.

Heat pumps? I've heard baaaaad things about them, like they are unreliable, they cost a fortune to get fixed, they don't actually save that much power, $$$ or green house gasses? But they are by far the cheapest option because of all the govt rebates? Like around the $900 mark (with rebates). But we can't use off peak 2 electricity with them so running costs will probably be about the same???

Gas tank ? We've got gas to the house right where the tank needs to go? Around the $2000 mark including the $300 rebate?

Instant gas ? Around the $2200 mark with rebate?

Any comments? Particularly, how did you decide to go heat pump / gas tank / instant gas and are you happy with your decision?