Its hot! & water keeps coming.
I purchased the model Thermann GCF 26 6 star Model when the 320 Litre solar powered gave up in 3 plus few months. I am glad I purchased this unit. Had I repaired other unit it was on its last leg with corrosion on the bottom of the water tank. This unit was recommended by the installing plumber. Did some research on this forum & forked out $1100 for the unit.
Pros. Works well. We are 3 people family unit & we tend to take quick showers even with a teen in the house. Takes about 30-40 seconds on coldest days to get the hot water going. There's no boiled water or like constant boiled hot water tank which saves a bundle specially at night when it constantly get be in the 60c temps.
According to packaging this was made in Japan. Not many come electronics come from that region, perhaps better quality.
Cons: There's no tank so you have to wait till the heater element to get kick started. If some one has taken prior shower I find the hot water flow to be quicker. The first person in the morning will have to wait the longest to get the hot water going as the burner has to get it going & the water has to travel through pipes. I normally let the mixer turn to hot & leave it for few seconds. I also noticed if you stop the shower to do your body wash/ shampoo lathering, the hot water flow quickly disappears leaving with you with cold water flow. I am not sure if its easier to leave the hot water running wasting water which will give you hot water flow. I am ok with turning it off & waiting for another 20 30 seconds to get the hot water going. We live in an age of impatience where waiting for hot water for 1 minute becomes painful, then I think of all the people in remotes parts of the world who do not have any running water. Then it becomes lot more to enjoy that hot shower.
Its only been a month with the unit. I did check with the company they said it has 12 yr warranty, in reality I am sure it will be part to break with in 3 yrs thats not covered under warranty.