Five years on the unit still does not work and Rinnai seem to have their heads in the sand. The problem appears to be in the sensors, and the PCB. Don’t waste your money!!

My unit has now failed for the 9th time in 3 1/2 years. The problem seems to be in the design or manufacture of the pump control system. As a result at night the pumps moves the hot water from the tank and cools it down on the roof. Rinnai are totally unhelpful. The ad hoc solution has been to put a timer in the power supply to the pump so it cannot run at night. To make matters worse the problem is intermittent.

I’ve reported that the pump on our Sunmaster 26 has been running all night 3 times since we moved into our new house 18 months ago. Rinnai tell me there’s nothing wrong when there clearly is. The pump whines all night. And you can hear it from our bedroom upstairs. It’s infuriating! Our guest room is downstairs on the adjoining wall and guests complain about the noise too. I do not recommend this system at all!!!!!!

I also fail to understand why the pump runs in the middle of the night. The electricity bill probably negates the benefit of having the panel in the first place.

Rinnai please take this seriously for once and do something about it!!

A new Sunmaster with evacuated tubes, no older than three months started to fail about 2 weeks ago and the installation plumber had a shot at repairing it but only made it worse. Started with the hot water spitting pretty violently and has now reached the point at where there is pretty much no flow at all. Called Rinnia service who subsequently called an agent who said we would have to wait 2 days for a service call. That will mean we are 4 days without hot water. I used to have a high opinion of Rinnia but would now like them to remove the system and will be asking them to do so, it is clearly not fit for purpose and their service arrangements are far from optimal.

My rinnai 315 sunmaster tank has corroded out. 5 years 2 months after install. Warranty is only 5 years. Rang rinnai to get their help - hoping for some goodwill support, maybe a discount on replacing it. Too sad, too bad mate, nothing we can do. The tanks are made in china - the vitreous enamel lining would have been poor quality - and it rusted out well before it should have. My last aussie made tank lasted 17 years. Same water quality, the only thing that has change is the poor quality materials used by rinnai. Now $1780 to replace the tank. That's $350 a year for 5 years. Would have been cheaper to forget solar all together, just pay the power bills, and have a hws that lasts for 10 years or something.