Hot water is hit and miss, it works sometimes and not others. The unit had just been fitted when we bought the house, we've had the Bosch Plumber out to attempt to and repair it twice, still no improvement. Bosch replaced it, after fitting Plumber said "if this one gives you trouble just turn power off and on to reset" (knowing full well we were still going to have trouble). New one no better! I dont know how Bosch can still be supplying this ridiculously unreliable junk!

The unit takes for ever to heat up and water and gas bill was much higher then normal. Temperature fluctuates from hot to almost cold and hot again. Tried on numerous devices to connect and never does. When turning on the hot it even takes a while for the pressure to come up to normal from a slow pour to a fish of cold water. Had a bosch hot water before and was great but never again

This Unit is completely useless, can take anywhere from 2 minutes to 15 minutes for hot water to come through wasting litres upon litres of water. Bosch used to be good obviously not anymore..

Today is the 5th time a plumber/gas fitter has worked on this unit.
1. Fluctuating water temps and won't heat adequately
2. Trips the power box
3.Noisey and now randomly activates in the night
4. My electricity and water bill have almost doubled due to having to run so much water to get hot water at all, can't regulate the shower properly. Can hold my hand under hot water in kitchen as it is not hot enough and the system box is 1 metre away.
I would NEVER recommend this unit to anyone and if I could give Bosch 0 (Zero) stars, I would.
Not a company I would ever deal with if I had a choice again.
Many people in this village have had units replaced.
I am not participating in any giveaways or promotions. I am a disgruntled consumer.

Works sometimes but mostly not..... replaced under warranty but unit still no good, never again Bosch any other brand must be better than this unit. Please avoid even if the cheapest option.

switch off all the time reset randomly barely get even one warm shower a day
two visits from warranty 3 under way current 5 days to even get their agent ot call back

Have 7 units for motel, a disaster decision, never again. Bosch is a disgrace. The units stop operating and need rebooting off course when guests are in the room & complain

This unit seriously is not good.
Its the 3rd unit I have had in various dwellings, and only this one is damn unreliable.
Its in a Holliday home in remote location and I think I will get it pulled out and get a different unit.
Only installed just over 12 months ago and it always switches off and needs re- booting.
Now thats not even working.
My main dwelling has a 15 year old unit going well.
The optiflow 26 is a complete load of crap.
Not good enough in this day and age.
Phil

The unit stopped working two months after we moved into a brand new house. Found an online guide to fix it but couldn't get it to start again. Real estate to got someone out three days later and got it going. Since then I regularly stops working. Gas bill is now through the roof. Wastes so much water waiting for it to heat up. Worst unit I've ever come across.

The unit constantly requires to be turned off & on again to work.
Sometimes, the hot water doesnt come on at all.
There have been countless time this has happened over the last 1 year of buying this product. Never trusting Bosch products again.

Stopped working on 366th day. Warranty ran out. Had to call these clowns twice while under the warranty as it would not heat the water. Chucking this piece of crap in the bin. Terrible terrible stay away from this product

We are extremely unhappy the water comes out Luke warm at all outlets. We can not have a bath with out keeping the hot water tap running the whole time and releasing water. We are washing all the dishes twice and having to boil the kettle to fill the sink to be able to get them clean. When the water gets to its hottest temperature it will then have a section of cold run through then heat back up. The amount off water we are wasting, our time being consumed with re washing and getting in and out of the shower, keeping the bath tap running and the extra cost on our bills is causing a great deal of stress. We have emailed the company to resolve the issue and no response. ACCC is my next step.

Purchased the Optiflow 26l, on January 2018, I have had a C1 error twice in 12 months, and of course each time on a weekend when finding a plumber for less than $200.00 for call out and 15 minutes is impossible. I have taken 2 cold showers and boiled water on the stove for my son to bathe in. Was told the circuit board needs replacing and was even told to just replace the unit cause he’ll be back out in 3 months time to fix other things. Still waiting to hear back from Bosch. Very disappointed, not what you expect from Bosch products. If you are considering a Bosch water heater avoid it if you like hot water in the bathrooms.

No high demand in house, 2 people. Can not obtain hot water for 12 months. Water is always tepid, taps and showers run for mins in order to get warm water. First time that I have filled the bath today, nearly full, cold and system is on wall of bathroom. Have had Plumber out months ago to tell me that it is set at regulation temperature and have had a meter upgrade also..Water bills have been MASSIVE as waste water trying to obtain more than warm water in shower and sinks..Worst purchase ever made!

Like other reviewers, we have found the time to heat impossible. Our bathroom tap is right next to the heater - maybe 2-3m of pipe, but it takes 30 seconds to get hot water. Same problem with going cold and reheating if you turn the tap off even for seconds. The local supplier did get a serviceman out in a couple of days - they replaced the PCB but it has made no difference. I suspect it's the "efficiency" - will be pushing my builder for a different unit to replace it.

Rubbish unit and stops hot water all of a sudden. No warnings and had to rest the power and then cal several plumber. Seriously this reviews above shows that this unit had to be recalled and it should be illegal to sell such units. I hope Bosch can respond quickly as I have completed their online complain form.

Just moved into new house and this unit plays up every day, randomly, we have to turn it on and off to get hot water. Made a call over 7 days ago and no one has been yet. I have 2 kids and a pregnant wife at 36 weeks. Paid the extra for Bosch and am very disappointed.