We have the rinnai instantaneous gas. Love love love it! It's so cheap to run, made such a difference to our power/gas bill, that the big price tag ($3000 ish) was offset. We had to replace it unexpectedly and luckily could get a finance plan that stretched out over 24 months phew! I was just excited that I could wash all my dishes AND bath the boys in the same hour lol. I think hubby is excited that his shower isn't cold halfway through cos I'd hog the water. Can also set the perfect temp for the boys bath and not wonder if its too hot/cold.