Service 90 error codes frequently displayed, just over two years old and now out of warrenty. Can't opperate above 21C or cuts out, even when functioning correctly did not heat effectively. 5 stars for safety though as it cuts off frequently.

Replaced an older Vulcan Heritage Heater with the Rinnai Ultima II - and simply it does not heat anything. You can be standing 2 feet in front of it and there is not warmth. After 8 weeks of phoning every second day and trying to get something sorted with Rinnai, they now tell me that it would never be able to heat the room that it is in and therefore I need something more powerful. The Vulcan used to heat the room and the Rinnai is meant to be more efficient with greater capacity.

Worst choice ever.
I replaced an very old but very reliable Rinnai and have been driven crazy with '90' errors ever since.
Call out costs are impossible on a pension so I carefully cleaned the dust out every few months only to gain a few more months of operation - a ridiculously tedious and unfriendly process. Now it's error code 14 and with the current cost of gas I'm giving up. This overly sensitive technology might survive in squeaky clean parts of Japan but just doesn't cut it in Australia.

Had constant errors (usually code 12 or 13) since warranty period finished. When it works its great but this is getting less and less common. Difficult to start when needed therefore tend to leave on more than necessary. Many others have this same problem. This is a known defect. Difficult to recommend.

So regret buying this piece of crap have had nothing but trouble have to keep pulling it apart to dust off sensor for getting to much dust and it won’t ignite. First time it happened was first year of warranty we got it fixed. Then it kept happening and every 3 weeks dust gets built up and it won’t ignite. I’m so annoyed it’s only three years old now. Don’t waste your money.

Only had the heater 3 months. It heats our open plan house very well wich I didn't think a space heater could do.We had a gas log heater before this and it was useless. Very happy so far.Maybe some of the problems people are having is from poor installation. Thanks

I had to replace a piece of glass that I had accidentally broken as i was cleaning. Rinnai did not want to supply me with the glass because i do not have an account with them so they suggested me to go to plumbing supplies and it cost me $245 for a glass that is 555mm x 225mm

I am having trouble getting the current temperature to stop rising, I have the heater on Gas/Econ with the Set button at 16, however the current temp keeps going up and tonight I was so hot when it reached 23 I had to turn the heater off. Any clues as to what I am doing wrong. A bit worried also by the lack of good reviews, I do hope that everything goes well with my new investment.

Purchased the Ultima approx 3 years ago, has an error code 70 which I found out it's got something to do with a faulty switch. (would you believe it's only 3 years old) Called the Rinnai service dept, a tech will contact me within 24 hours (great I've got a 76 year old mother at home with no heating mid winter) and got quoted a call out fee of $190 that includes the first 45 minutes labour + parts, that's close to 10% of the purchase price just to come out. Dare I say this is a common problem. Buyer BEWARE.

this heater spends more time on error codes than working I had a Vulcan for 30 years before this that never skipped a beat I would not recommend this heater to anyone the most unreliable fault ridden piece of equipment I have ever bought rinnai should hang their heads in shame for selling this to consumers will buy nothing with the rinnai brand on it ever again

Ive had my heater repaired well over 20 times. And it's stopped working again tonight. Biggest lemon of a heater ever. Also been informed that there are many others with the same issue.
There are many design faults with the heater, reality is its faulty.
I can't be bothered calling about the issues anymore. It's to stressful. I would just hate for someone else to waste their hard earned money on this heater.

I am freezing at home with a code 12. I had it serviced this year but nothing seems to help. I did not expect to have to pay two lots of $195.00 plus parts in the same year. How can a pensioner keep warm. This situation is too much to take. I think one service per year should take care of things

Purchased my Rinnai Ultimate 11 end of August 2014. Come this winter and still within warranty it kept cutting off with 14 ( overheat) displayed. I phoned Rinnai who gave me a service no to phone explaining I was still within warranty. Service completed, it needed a clean apparently, then informed Warranty doesn't cover and this will be an ongoing requirement . Very disappointed to have to pay for service when I haven't even had my heater for 12 months. Apparently there is no method for user to remove dust getting into heater, thus requiring payment to servicemen . Would have reconsidered buying this heater had I known! Disappointed! Apart from that heater is effective and cosmetically appealing.