Our unit has been running flawlessly for the past 5 years. I installed controllers next to our showers + kitchen and the kids love having easy control of their shower temp. Energy efficient - Gas bill is nice and low - although installation was high (thick copper gas pipes).

Temperature fluctuation is minor when say the washing machine and/or dishwasher kicks in while you're showering, but it's still warm enough and it very rarely happens. On the flip side, you don't run out of hot water (except during a power outage)!

In all, no regrets and would install again.

We just had this system installed to replace a gas storage system. It's working great so far: very hot water, on demand. The water stays nice and hot; you can set it higher than the recommended temperature at installation (45C I think?), and I thought I'd need to, but it's been hot enough for me -- even in the room furthest away. We don't have high demand (2 people) or run the unit for long (water-saving mentality!). Can't wait to get my next gas bill to see how much we're saving.

I bought an enviro 26 in 2010 and it has run like a clock ever since. Rinnai gave me and extra 10 years warranty on the heat exchanger when i bought a second temperature controller. Rinnai gave me $150 cashback after purchase. I am extremely happy with my Rinnai and would happily buy same again. I am about to buy another enviro 26 for my father - to replace his electric system that is junk and just costs $$$ to boil water all day. Many thanks Rinnai - top quality Japanese hot water systems :)

Seems nothing lasts like it used to. The old instant gas hot water system lasted 25+ years! the new energy efficient rinnai enviro 26 is 0.5 years out of warranty (3.5 years total) and is dead. The plumber says the junk yard is full of these units, just install another one and start saving to replace it in 3-4 years... otherwise work well for the past 3.5 years.

We have a single story in Melbourne. I have to have showers with hot water only because it's just hot enough most of the time. Sometimes it's lukewarm and too cold for a shower. Rubbish. Someone else mentioned that theirs stops producing hot water when it rains. That might be the same for us.
Small.
Water isn't hot enough.

We install it with 2 remote controllers, set to 40 degree on shower and 50 degree on kitchen. Kids don't need to turn on cold water to adjust temperature, and don't need to worry hot water temperature issue. Recommend install it with remote controller, it will save your water and gas bill.
Energy efficient.