Thermann Gas Continuous Flow 5 Star

Absolute rubbish. We didn’t ask for this brand and it works far worse than our broken Rheem Show details

When your plumber suggests you replace your hot water system with Thermann 16I G series C/Flow 50deg N/G tell them NO WAY!!!, go for reputable brands. This mob (including Mitchell from reeve at blacwood plumbing) couldn't give a damn about after sales service. My new Thermann is SO LOUD EVERYTIME the hot water is turned on even the neighbours… Read more

complain Don't waste your money unless you can put up with shocking noise from unit. Thermann QLD "receptionist " said "oh they ALL make that noise" and inferred it was an exaggeration on my part. Managers had all gone on their xmas break and left her with that pathetic response.

Don’t buy Thermann instantaneous 26 – Wish I had stayed with conventional storage-type system. Our Thermann 26R is incredibly disappointing. It may have a great energy rating but we use much more water waiting for hot water to come through. Water occasionally goes randomly cold during a shower and if having a shower no other hot tap can be used without the shower going cold. In 2023 I… Read more

didn’t expect any issues with hot water would even exist. Water temp is erratic and unpredictable and rarely hot enough to clean a greasy dish.

This unit was recommended to us by a plumber, I deliberated between this and a conventional tank and based on their recommendation, I’ve made the wrong choice.

Our last system lasted for almost 20 years, never missed a beat and provided consistently hot water to the length that 2 showers could be had simultaneously.

How can such a product exist, based on the reviews here it isn’t just my unit playing up. Wish I could get my money back! Turns out the state government would have put a heat pump storage unit in for free!!

Update… not long after I wrote this review I spoke to a Thermann representative, after a long conversation, they were unable to provide any practical help. I was also told the temperature couldn’t be increased. However a quick search on google showed me that it was in fact possible. Not sure what they’re playing at but I’ll be sure to head towards a trusted brand storage unit next time. And for what it’s worth, the unit has not become any easier to live with.

Never recommend Thermann 26 Continous water heaters to anyone – On the recommendation of a plumber, after much deliberation I decided to switch from conventional gas storage hot water system to an instant heater few months ago, when my previous storage gas hot water system (normally rated for 7-8 years) failed after nearly 13 years in the service. Now I repent for having made that decision and feel the heat… Read more

every time I operate my kitchen tap mixer which gives me either icy cold water or extremely hot (60 degrees) water, not being able to control and mix to a desired temperature.

Few months after the installation, and having complained to the seller of this heater, a specialist from Thermann visited my home and checked the water system. After having measured the temperature etc., he realised that it was not possible to mix hot/cold water when the water flow through the tap is NOT at full flow. In other words, you must open the tap fully to deliver maximum flow to get it mixed properly. Having got 2 separate stop valves in both hot and cold-water inlets to the tap mixer, I was able to demonstrate that the mixer works ok. He admitted that this is an inherent flaw in the system which he could not rectify.

The only consolation is that all other mixer taps anywhere else in the house works ok, apart from occasional erratic behavior.

I wouldn't recommend this type of continuous flow water heaters to anyone.

Disappointed user.

Temperature inconsistent – I have thermann 26 Instantaneous gas HWS - if I have shower the temperature goes turn cold then hit them cold again it’s in any tap I use in the house. The temperature is never balanced. Show details

Intermittently goes cold – Purchased it in 2018. It was fine for 2-3 years. In the last year or so the hot water temperature drops to ambient cold after 2 minutes which requires it to turn it to full hot for almost a minute of running the water to regain the warmth. Also it turns on even on the opening of the garden tap. We are on tank water and on 45kg cylinder. Such waste… Read more

of gas and water! Had phone discussion with the technician: error with plumbing, error with the gas regulator. Everything else is faulty but the device... But if you search for glitches and errors, the majority of the people complaining about exactly the same things! Because the problems had arisen in the last year/and half so it was ok, but now, the company steps back from possible source of design fault, lack of durability, etc. and want to send the Buyer/User into many hundreds of dollar cost with other trades to potentially that the unit is faulty... I have downgraded the score to one star - I can not give less!

Really disappointed – I've just moved to another house, with a Thurmann 26 fitted. I have the exact same issues as Rob. At slow water feed, it cuts out to freezing cold water. That happens in all - the shower, the vanity and the kitchen sink. Very disappointed. Its crap. I want an ability to run a slow hot water feed, to save water. It won't. You have to run any of the above mentioned taps hard to get hot water. Nowhere near good enough! Show details

Brilliant customer support and knowledgeable plumbing consultant – 750 ltr gas system great : cf to old Rheem system: no longer issues with running out. After market support - quick to respond and expert advice over the phone - well done!  Show details ·  1

Hot water goes off – Several times this system (which was recommended by a plumber) has gone cold halfway through a shower. It eventually comes back on. I rang the plumber who told me to switch off the power and switch it on again and it should reset. But for the price I paid, why should I have to ? Show details

Not a bad unit but water is not hot enough – When I purchased our Therman 26 with our house package I asked for the 60 degree model advised that I won't need it. Told Thermann 26 produces hot enough water crap!! Water is not hot enough to wash dishes or have a decent shower. Told by Reece that you cannot replace the thermostat with the 60 degree controller. Apart from the temperature issue pretty reliable. Show details

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… Read more

$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.

This is a waste of money – Water temperature does not stay consistent temperature, can not have a Luke warm shower on the hot night without it going cold, water pressure for a normal has to strong terrible gas hot water system. It is extremely good on gas too bad you can't say the same about the show