Bosch Hot Water & Heating HydroPower 13H Questions & Answers

This is because the system is not detecting sufficient flow of water. Turn the tap to max - if this does not work, then turn the tap off, wait 1 minute and turn it on to max as fast as you can... wait 60 seconds - watch as the system which claims to have a good energy rating wastes water.... if this does not work then turn all off again...

wait a minute - then turn on tap to max very quick - then go to another hot water tap and turn that one on as well to max.... - if this does not get you hot water then your water pressure is either not enough or your system is stuffed.

Do not try to turn the cold on at the same time until you have the hot working - and even when the hot works - be careful turning on the cold depending on your tap or shower attachments as this may slow the flow of hot enough to make the system shut down the burners again.

Sit back and watch your water bill and gas bill go through the roof even though these systems claim to be energy efficient.... obviously only under lab conditions with the perfect pressure.

Your other option is to take the cover off.

There are two user adjustable settings (at least on my 16H) - one shows 1 to 3 flame symbols - this is for adjusting the temperature from low to high flame... this can be increased for hotter water - but this is not your issue - you are not getting enough gas to light the main jets, only the pilot light...

the second adjustment is a knob below the slider - this adjust the flow of gas in general - turn this to max - get some one inside to turn on hot water to full - watch and see if it now lights.

if this worked you may then need to turn it back a little and or adjust the slider so that your hot water when it actually works is not dangerously hot.

You don't. When you turn the water on it spins a small generator that ignites the gas. These font have a pilot light.

Sorry but the unit is rubbish, I have had three plumbers in to try and get hot water but all say there is nothing they can do. They have contacted the Bosch technical team and spoken to them while they were here and the answer by the technical side was there was nothing more that could be done. The unit is useless.

We cannot turn the temperature up more than maximum on the unit, I have a shower on full heat! We have to turn the tap on a number of times to get the heater to work. I will never buy another Bosch product.

Not familiar with the model. The H for Hydroflo in the model name usually means it has a Water Wheel igniter (no pilot light). I'd be calling who ever installed it to check out the electrics and the gas flow.

I don't know who installed it but would a gas plumber/fitter know?

I have the the same problem how did you fix it

Probably a dirty pilot jet.

Remove the little aluminum pipe to pilot piezo.

Its got brass 10mm nuts. Be careful the jet does not get lost it is at the top of pipe.
Remove the jet (its as big as a babies fingernail) blow through it and wipe it in your shirt. Its the tiniest little hole and gets wax from dirty gas stuck in it.
Put it back in and refit pipe. Try that.

Thanks for the thought Bog Balls. The pilot flame seems to be OK.. the main burner lights up ok... but then dies out after heating for around 20 seconds.

I have the same problem. Did you find a answer mate

Hi John. Typical fault. Water driven ignition module has failed you. Part and gasget is too expensive to replace and will only fail again and again. You have joined the club of Bosch junkers. Spend your momey on a Rinnai infinity. Get the B26. Same heating specs as 26 just a few hundred cheaper and no led status light. Warranty a bit shorter as designed for builders who supply warranty on new home. Family will thank you. You have to learn to let go as you can't polish a turd. Learn by my mistake.

Paul
Same problem I had the water that releases the pressure on the diaphragm for the main burner is not getting through.
Follow the copper pipe that comes out of the hydro generator it comes back to the front of the appliance and goes into the housing mine is gray and has the knob that adjusts the flow. There is a metal u clip on top of where the pipe enters the housing pull it out the pipe will pull out and can be moved to the side.
Look into the housing and you will see a round brass pipe there will be an opening beside this pipe with needle nose plyers pull the brass pipe out it will be stiff/tight but is only held in with orings it has a small jet on the opposite end this will be blocked clean and reassemble main burner should work
Cheers Baxy

John
Check if you have a flow restrict or in the basin spout or if it has flexible hoses connecting it may have a restrictor in the hoses pull the plastic restrictors out and throw at the cat.
Good luck Baxy

Hi Annie,from what i was led to believe is the hydro unit have a one way trip,and would nearly be just aswell to buy a new unit which i did as that payh suited me at the time.The plumber that checked mine switched a couple of wires around but it did not make a difference,sorry i couldn't be of more help,regards Adrian

Hi Bill & Cath,
Seems like these Hydropower units are a cause of concern for us the end users. I have a 16H which also has problems providing Instant hot water when demanded at taps being used, but cold water comes through and my Brother in law who visited me this weekend got caught in the shower with hot water at the start after 6 litres went down the drain.He got out trembling as the temperature was around 7 degrees in the house at that time of the morning.
He had to reopen the tap again and watch and wait for the hot water to arrive in the shower from my unit which is just approximately 10 feet away.
Unsure why your unit has this issue, as when the main burner is full flame water should move through the pipes.As you say the heat exchanger coil does'nt even heat up would elude to the fact that there may be a block in that area.Possible service check which may be costly or revert to a system that has the old type pilot light which we never had problems with.
The modern way thinking to save costs on gas but wasting valuable water is something I do not comprehend.I am still trying other methods to get my 16H performing as the Bosch 960 water wizard did or change to instantaneous units in the shower,kitchen and laundry which will give me satisfaction.
I am unsure about LPG as I have never used them but the overhead tank may work, but after a certain time the tank may leak and cause water damage if installed in the house cavities.
Hope this helps.
Regards,
Esmond

Thanks for the reply I'll work on it. In the end I think I'll probably replace it.

Already answered thanks
Esmond