After our 6 year old Quantum heat pump imploded due to electrolysis we checked the reviews on most efficient and cost effective hot water alternatives and settled on the Sanden Eco 315 heat pump which best took advantage of our solar array.Ben Cole from Newgen Solar in Melbourne visited us to outline the attributes of the system which included very quiet fan operation, stainless Australian made 316 tank with a 15 year guarantee, ( no annode needed ), quality installation and removal of our defunct unit. He took care of the govt. rebate and true to his word had the whole thing organised to be installed the next day. Cost with the rebate was $4500. I will give you all an update when the unit has been in operation for 6 months.

Have had our Sanden Eco Heat Pump 315L for just over two months now. Runs on overnight tariff for a household of 5 and have had hot water 24/7 with no issues. The unit is so quiet when running it is unbelievable (yes I got up in the middle of the night to listen to how quiet it was) The Sanden replaced a 15 year old Rheem 250L electric storage unit which was using 11.5kWh a day on average. In comparison the Sanden uses 2.6kWh a day on average since install to heat a 25% larger tank of water . On the Sanden website they state a saving of 78% over a conventional storage hot water service. My figures absolutely support this claim. Loving this amazing product

Sanden are a good company in our experience. However do not purchase this System if you plan to use it for Hydronic heating your home. Enter Store in Eltham advertised and sold it for this purpose and it doesn't work efficiently nor does it heat as it should. I expect it would be OK for hot water alone. There is lots of info from Sanden as to its effectiveness. but under no circumstances buy this thinking it will work, as Enter Store have advertise, as a solar heat pump for hydronic heating, it was Not designed to do so and don't let them tell you otherwise.
Pls note I'm rating this for hydronics not hot water

Quieter than my aircon and only cost 1/4 electricity to run.

Yes the up front cost is pretty high but it will pay it self back in about 3-4 years.

Would never live without one if we ever moved.

And the unit is pretty smart as its a separate system so you only need to replace one unit if the tank or heat pump broke

Had my Sanden now for 3 years, since I replaced my Rheem heat pump.  Other than when I hang out my washing where my peg basket sits on the unit, I never notice it.  Never hear it, never run out of hot water, never failed – A considerable improvement from the last system.  I’ve noticed the electrical bill is less too as there is no sneaky element kicking in.  Definitely recommend a Sanden Hot Water unit.

Recently replaced my storage gas HWS with a Sanden heat pump unit and couldn't be happier. I've set mine to reheat from 11am - 5pm to take advantage of our solar panels. Even in Canberra's cold winters, it is heating the water within 1.5-4 hours (with longer being on colder and higher use days). Even at peak electricity rates (if completely clouded over), it costs 50% less than gas use was costing and with solar generation a whopping 80% less, and that's in the dead of winter with high use! Compressor unit is whisper quiet and the whole system looks solidly built.

The ultimate in quality ...Amazingly quiet.... So cheap to operate, stainless steel tank...And no frost issues ... Forget solar unless it is backed by a sanden, I did away with the hot water tariff, as the fix charge was 3 times more than the usage charge.. Saved $360 a year on that alone

I swore I'd never buy a hotwater heat pump again. For the last 6 years we've only had warm water but now it's hot again. I'm glad that I listened to the salesman and tried one more time. It's a high quality unit and whisper quiet. Japanese heatpump, Australian cylinder.

The Sanden is built as a quality system that cannot be faulted. Audi and prestige cars use Sandem for aircon in the auto industry.
Mine runs from 11pm to 5 am on a 315 l tank and has very efficient hot water consumption.
Mind you if you use all the 315 l in a day and have a block out period., you'll have to wait the next 40 mins after it starts to have hot water .
I've been caught out.
For Melbourne weather it is the most efficient and unrivalled

Our house was large with 6 bedrooms and 3 bathrooms. We had a large heat pump hot water system which stopped working after less than 4 years, in October 2013. We also had high power bills, I think partly because we could not programme the hot water system to only operate at certain times. We replaced our old system with a Sanden Heat Pump system, which we could programme. We then enjoyed a significant drop in power bills, and the new system was much more quiet. The Sanden system cost us about $4,800 but produced plenty of hot water much more economically. We sold our house a year later, so we only had it for a year. But based on that year's performance we would strongly recommend the Sanden Heat Pump system.

When you tell friends how cheap this is to run they just don't believe until you show them power bill. Had unit installed august 2013 by Sackett services Tasmania. Using average of 4 killowatts a day that's about 60 cents a day for 315 ltr.4 person house showering daily.very quiet,fast recovery.

We were really happy with our Sanden Heat pump. The only negative has been that after install we were informed that there have been a few instances in QLD where the pcb has been damaged beyond repair by geckos. The pcb replacement cost would be $1600. Sanden was offering pcb covers to be installed. This cost us an extra $129 including install; however I believe that this is a manufacturing oversight as the product should be designed to cope in the Australian environment. I think Sanden should have fixed this problem as it was their mistake.

We replaced our existing, (just over five years old), failed heat pump, with a Sanden heat pump a couple of days ago. It was less cost to purchase and install. It is very quiet compared to our previous heat pump. Within thirty six hours I could tell that this system was using around 10% of the energy (bear in mind that that figure would be far better on an all electric heater, and if our old heat pump was repaired correctly under warranty it would still beat it by 75%!) that our previous heat pump system was using (that is even with the booster element disconnected). :)
Over the moon and most happy.