I installed my current heat pump in November 2006 and have had relatively no trouble until I tried to order a top lid, which has badly rusted. After my initial ring to head office in Sydney, I was told the part was available and to just ring and order, simple really(really????).
I rang two days running and left the requested voice mail message with my query to order and the requested call back details - still waiting to be called back.
Subsequent to this I emailed the General Mangers P A and, guess what, still no response after approx. 3 weeks.
Would I recommend their after sales service, hardly.

I have NINE of these units on my property and due to poor manufacturing and an abysmal component failure rate I'm down to two that still function. One is working, the other needs to be coaxed into working as I have been told by a technician that certain electrical components were not made weather proof from the factory. More over, just trying to get a tech to fix these things takes upwards of a month and last time (and very much the last time!) I was handed a bill for nearly eight hundred dollars. At least when they stop working you can tell by the flash and bang from the electrical part that isn't weather rated properly as it arcs itself into oblivion.

Thought we would save money with the energy efficient model, it lasted 6 years and the tank burst, the initial cost was approx $4000, so what we saved in power we just lost in having to purchase another hot water heater, but certainly not another Quantum very poor product life.

Wouldn't go back to gas storage, instant gas or elemental electric
This thing produces endless hot water for my medium size family
12 months on and hasn't disappointed us yet

just out of warranty and you guessed it leaking water from the tank,
I have installed at least 20 plus quantum hot water units within the last 6 years and have a failure rate of in excess 25%, NOT HAPPY JAN I would have a drama installing another quantum sad but true.

Quantum heat pump split after nearly 3 years. Quantum sold me a new one for 1400.00 delivered but still! They also get to keep the rebates. Cost of plumbing, electrician, etc. makes for a pretty expensive heater.

We installed a Quantum system (Heatpump hot water) in 1993 when we built our present home. As it's an old one you cannot get the gas (R21?) for it now but it's cheap and trouble free. Ours lives in the corner of the garage and makes little or no noise. This model has collectors on the roof through which the gas flows and exchanges the atmospheres heat. It seems to work best when it's raining or blowing and uses 500W. $20 a month for hot water....

Hi, we've had our Quantum 340L heat pump installed for about 5 months now. We live in the Adelaide Hills and run the system using off-peak electricity. It has worked perfectly even during the cooler nights. Compared to our old element system (also used off-peak) we now only use about 20% of the energy. Our annual electricity saving is $650 pa (daily cost to heat water is 40c vs $2 per day). I was concerned regarding the noise from the other reviews but they aren't very noisy. We have ours located outside the kitchen windows and have trouble hearing it from inside the house. Fantastic. If you are looking for a reliable installer in Adelaide we used SA Hot Water and they were superb.

We have had our 250ltr quantum heat pump for 9years...replaced small white cylindrical solenoid 3 years ago but no other issues. It runs for 2-3 hours like an inverter aircond so don't place unit near bedrooms. Our electricity bills are very low with this system on off peak1...wont heat up enough on off peak 2 as we discovered. Would highly recommend this system

My quantum heat pump compact 340 has rusted out after 5. 5 years I swaped it from a twin element 400 litre electric heater when the rebates were on but it has not lasted it has a roof over it specially made to protect heater from the elements but it still rusted out, will see what quantum has to say on Monday when I ring them to complain as I am a plumber that has installed a load of these heaters and now my has rusted out I am waiting for my customers to starting ring me that there's has crap it self as well as my was the first that I installed after doing my research on heat pumps

Just updating my experience with expensive and ineffectual repairs to our Quantum Energy Heat Pump (reviewed April 18). Thanks to Quantum's intervention, their service agent yesterday refunded the amount charged, less the call out fee which we agreed to pay.
After four weeks with no hot water we are now able to purchase another hot water system.

Our Quantum has just died after approx 20 years of use. Very cheap hot water. It was in the garage and we had no problem with noise or rust. We are going to replace this with the smaller 200L unit as we don't need the bigger size.

Noisy yes but used little electricity and compressor ran for 14 yrs. About what you'd expec from a fridge or similar. Hoped for more but pretty happy.

Unfortunately installed these units six years ago and put up with the noise throughout that time. Neighbour thought we must have a very clean house as she thought we were using the ducted vacuum all the time! May have been more energy efficient, but having to switch from off peak to peak power meant they were no cheaper. Broke down after warranty and thankfully only $300 repair. Lived with these units until we sold the house and moved. Have nothing good to say about these units. Never again.

From the first day we moved in, I was aghast at our new water heater roaring away outside our bedroom for hours every night. The only positive thing:yes, it produced hot water. Advice: note the past tense and steer clear.

I have had 2 270ltr units installed on my home and besides a malfunction with the computer on one unit, (which was covered by warranty) I couldn't be happier with the quantum heat pumps. It provides hot water to my taps faster than any other unit we looked at and with the temp set its never scolding hot. Thumbs up from WA :)