Rinnai Infinity 26 with two controllers $1299inc and you get a $150.00 cash back from Rinnai so $1149.Promotion runs till end of August I think. I went to Parkwood plumbing very good prices IMO. They were also doing BOSCH 26 with two controllers for $999.00 inc.
Check your gas supply though. I have been told instantaneous burn more gas maybe more so than your storage.