judging by the comments i have to agree with all of the complaints because mine has the same issues as everyone else takes ages to warm up, never gets warm, sometime get warm, then get cold warms up cant control the temp then gets hot turn on cold then no hot water very frustrating call a plumber says its the spider trap ok works for a while then same thing happens only in the morning and at night so call plumber tells me buy another brand bosch are terrible

Unit has a mind of its own . You waste a lot of water before it heats up then it fluctuates and doesnt hold heat, dont you dare use any other tap around the house for hot water it just isn't going to happen . Bosch makes other products that are beyond amazing but i think they should stay away from continous water systems . yes unit has been looked at and has been replaced . The only thing that I can say is that it is sitting outside my bin enjoying the sun and rust not much to say but shame on the person who designed this and went home and said what a machine i designed .this person is the devils cousin what a heap of rubbish stay clear you have been warned

Hydropower 10H is making noise when
Not in use, sounds like a fan I’d running. Is this a concern, or is it dangerous? It’s quite loud and can be heard In the back bedroom

The unit is firing and gas is heating. But suddenly the past month my water is not Hot. I have just gone out and checked again ignition works fine gas is burning. By the time it gets to my taps I can hold my hand under it. I’ve turned everything up. But still warm to touch after running water (hot) for 4mins. Any one else have this.

Unit is a couple years old, consistently won’t light. Have to then wait for stupid lock out or have cold shower. Can’t wait to throw it in the tip and get something that works

If you are looking to install or fix a Bosch hot water system I recommend scrapping you unit and replacing it with a reliable brand. Our gas fitter sourced $270 worth of parts to replace the hydropower and to refurb the main chamber, this didn’t work so the unit had to be scrapped. This cost a considerable amount of money. We would have been much better off to replace the unit as soon as it failed with a reliable brand.

How can there be so many complaints from so many people?? We've had this system running flawlessly in Melbourne since July 2012. The distance from the gas meter to the Bosch unit is over 20 metres yet there's enough pressure to run a hot shower with the gas ducting heating in winter. Extremely pleased with this super reliable product and would not hesitate to recommend.

Absolute GARBAGE product! From day one it broke down & since then numerous visits from plumbers trying to fix the damn thing! Nothing but trouble! 4.5 years & we are up for a new one. $1400 for nothing but an overpriced wall hanging! Customer service was very average. Kept getting excuses of ants or insects blocking the pipes! Well I'm with the plumber now & no ants just a piece of crap! Wish i had reviewed this product sooner as there is obviously a lot of ant problems about! LEMON!!!

bought this for my outback property years ago and has never worked properly. it's alright when it's being used every day but if not used for several months won't ignite, takes constant switching on and off to get it started and sometimes not at all. sometimes the ignitor works sometimes it doesn't. I ended up smashing it to pieces with a hammer. The trouble is what do I buy? reviews from other brands are no better.?????

I had this unit installed in 2012 and it is still going well, I find it better to turn the water off to the unit when I go away and it fires up every time, it may be getting a little tired and when it does give up, I will replace it with another one.

February 5th 2017 Update: Hydropower 10h HWS

I made an error with my previous review, I actually had it installed in 2002 and it is still going well.I believe that the later models are much more efficient.A lot of people make the mistake of trying to adjust the Hot Water with the Hot water tap, you actually adjust the cold tap.

I can't run hot and cold water at the same time with this heater. If I turn on the cold water tap when running the hot, the heater unit cuts out and you only get cold water. It's been like that since day one. This is not like other Hot Water units I've had. Buyer Beware.

Absolutely rubbish. In the 1st two years of warranty, replaced ignition system, burner, heat exchanger and diaphragm. Works great in summer but when it feels like in winter. Diaphragm area is all plastic and leaks and cracks. It lasted 4 yrs.
Got a 10P yes 10P... Absolutely robust built, all brass around the diaphragm and way too hot. Got the water flow half way set as fully in too hot to shower with even cold water opened.
The 10H never even got that hot from brand new, even after the bosch tech looked at it 4 times during warranty.