Thermann 6 Star Continuous Flow

This unit works brilliantly, never misses a beat. I had a question that I thought was related to the system, I sent email for help. Within 24hrs man called & solved it which wasn’t Thermann system problem & he never charged me a single cent. Happy to recommend Thermann & Stephen to anyone & everyone AAA+++ Show details ·  1

What a disappointment - don’t buy, buy another brand – It has now been a year and the product has just got worse - avoid this brand of gas heater as very poor and their after sales service even worse - they take no responsibility for their product. Pretty shameful. I had a Rinnai that worked perfect and plumber said this Thermann was just as good - ABSOLUTELY NOT - I purchased one of their water… Read more

heating systems on the advice of a plumber and it had low pressure and temperature fluctuations which the previous Rinnai never did. When I asked for a warranty check it was said I would be charged for a warranty inspection - the plumber then checked and said it was fine but the system still doesn’t work properly - he then advised me to change the shower head ???? Such a bad heating system and service. Guess I’ll have to pay again and go back to the previous brand which worked like a charm.

It’s been months now since I posted the review - nothings been done and the water heater is performing worse - avoid at all costs

Reduce your electricity bill – My electric bill halved. It went from $1000 per quarter to $500 per quarter after I had the 26l installed. I’m not try to keep nearly 400 litres of water hot, on the back deck in the middle of winter. When this house it full of people it can handle it by not running out of hot water. The 26 preheats the water with the exhaust heat first. I like… Read more ·  3

this unit. Recently I’m having an issue with it going cold during a shower. Got to turn everything off then back on again to get hot water. Checked the filter and all good. Gas supply all good. Water supply all good. Any suggestions please? Thank you.

Great Quality unit – Have had one of these units installed on my house for over 6 Years now and it has not missed a beat ! We had Controllers installed with it too make it more efficent. (LPG Gas too) Show details ·  1

Support Review – Contacted support and received a call promptly by a specialist technician who was very helpful and friendly. Through troubleshooting was able to resolve the issue and was fixed next day by a tradesperson. Turns out no issue with the heating unit but an external tempering valve. Hot showers are back. Great support! Show details ·  1

Install a Rheem install a Rheem install a Rheem – Thermann is the biggest piece of crap you have ever seen. Last 3 years then it packs it in. No warranty in the bin. So install a Rheem cos Reece is mean so Install a Rheem.

THERMANN 6 STAR CONTINUOUS FLOW – We installed this unit on recommendation to replace a storage hot water system; to reduce gas usage. The water temperature is limited to 50, however it never goes above 45 degrees, which is tolerable for showering. However, dish washing requires at least 60 degrees to kill pathogens so therefore this temperature constraint imposes a potential… Read more

health risk. We now need to procure a hot water urn to do our dish washing. Furthermore, the amount of water wasted whilst waiting fore warm water delivery is very excessive; relative to the previous storage system. Water temperature delivery for showering is erratic. We very much regret having this "Thermann 6 STAR 20L NG 50 DEGREE" system installed.

Not happy with the product, but I’ll try to be fair – After posting my original one-star review, Chris from Thermann Hot Water gave me a call and discussed our issues with the system. He clearly wanted to resolve the issue if he could. Unfortunately, there is no simple solution, because of the age of the unit, but I want to give credit where credit is due, and soften this review accordingly. After… Read more

chatting with Chris, I’m willing to concede that my expectations of the system were partly unrealistic. I’m not happy that it can take over 10 seconds for warm water to start flowing, even when the system is sitting on the other side of the wall. But Chris explained that this is to be expected from any continuous flow hot water system, where cold water from our outdoor water-tank takes time to heat up initially.

The second issue is fluctuating temperature. It's not unusual to be enjoying a hot shower and have it go cold, or to be filling up a sink of hot water and then realise you've been putting cold-to-luke-warm water in there for a while. When we wash dishes by hand, we always boil a jug of water to compensate for this—there's just no other way to get the water consistently hot. In the shower, we've learnt to work around this by turning up the pressure higher than we would otherwise choose to. If we feel the water start to go cold, we turn the hot tap up further, and it usually sorts itself out fairly quickly.

Chris advised that these kinds of systems do stop heating if the water pressure drops below a certain amount, and their advice is similar to the technique we have naturally adopted. By doing that, I’d say we manage to get by.

So, these issues could be somewhat common to all continuous flow hot water systems—I don’t know. Or, there could be another, as yet, undiscovered issue with it. The problem is, the unit is now close to 9 years old, and long out of warranty. We only moved into this house less than three years ago. Before that, my wife's parents lived here and had it installed, and they just put up with it—stoic folk that they are! We’re not quite so tolerant, so after moving in we contacted Thermann to discuss the issues. At the time, they suggested that it was most likely water pressure or gas pressure. So we paid to have our plumber come out and test both. They replaced our water pump (since it was getting old anyway) AND the gas fittings (since the pressure from the gas tank was on the low side).

So at this point, with an ageing system that is possibly nearing end-of-life anyway, I don’t think it’s worth throwing more money at it. Chris had me check the inlet filter while he was on the phone and make sure it wasn't clogged up (it wasn't)—that much at least was free to try.

With all that said, the fact remains… I’m still not happy with the product. I can only judge it by how well it delivers hot water, and it does that somewhat inconsistently in our experience.

Been a great unit over the 5 years we’ve had it – Copes really well with high demand. Only issue with water temp has been when the power has tripped and we forget to turn the switch back on. Other minor thing is it does take slightly longer for hot water than the other types of units. Generally very happy with it! Show details ·  1

Extremely disappointed – The water is hot and cold even on the shortest link (less than 5m). Hansgrohe mixers. When it does work max temp is 45c. Cannot achieve continuous hot water. Do not recommend. Show details

Water Goes Cold – Water goes cold, eventually heats up, then cold again. Plumber says it's because we have water saving shower heads. Need to buy new shower heads which use more water. Disappointed. Show details

Thermann 16 – This hot water service lives up to all safety standards so as to not scold anyone especially young skin. We would have preferred hotter water in the kitchen though! The support from Thermann was excellent. I recently contacted them and they were able to explain the technicalities of how the unit functioned. Show details

Problem solved – Wasn’t happy with this product water goes cold while having a shower plumber from Therman and my plumber checked everything with good results more pressure with hot water fix the problem happy customer now  Show details ·  3

Good Value – Our plumber returned and fixed the problem. We are happy with the result. Still not as hot as H/W/S. We still have a lot of wasted water before getting hot water because the unit is outside. Overall happy with the results. Show details ·  1

Not As Good As The Old One – Last month our old HWS died so we called a plumber and he suggested we install a Thermann 20 gas continuous flow system. Having been without hot water for two days and with the old system pulled apart, we didn't have much of a choice so went ahead. We were charged $1705 (after a $100 pensioner discount) and while the system does provide hot water,… Read more

it's not a patch on our old one, so far. And the price seems excessive after seeing what other people paid for their's. We have to have the mixer tap in the shower so far around towards hot (about 7 or 8 o'clock) that there's hardly any cold water being used, therefore there's not enough water pressure. With the old heater (Rinnai from memory) we had lots of pressure and the mixer tap was at about the 6 o'clock position. Also, after first turning the shower on, it comes sort of hot, then fades to cool, before becoming hot again. The filters in the shower heads have been cleaned out but still no better.

great unit – I have had a C6 26L for 2 weeks, I cannot get it to fault as described in other posts on here. mine heats the water instantly, hot water in less than 10 seconds (3 meters from bathroom) I can turn on any other tap in the house and it does not effect hot water or pressure. Show details

Worst thing I have ever purchased – Never had a problem with my old electric storage hot water but made the mistake of changing to gas with a Thermann gas system. Plumber installed this system and from the start it has had such inconsistent temperatures - suddenly runs completely cold for 5-10 seconds which is not fun in winter. Complained to the plumber that installed it who talked… Read more

me into getting new tapwear as it seemed the cold tap was old and worn and that was the problem. After testing the new taps he noticed when the hot tap was on solely it worked fine for a few seconds then dramatically dropped in pressure and confirmed this by running the water straight from the hot water system outlet. Called his rep at Thermann who said it was the gas regulator so he replaced that. That has done nothing and is worse than ever. I dread showering every night as it fluctuates between extremely hot and freezing cold constantly.

Reliable Quality Built steady and efficient Hot Water Unit – This is the best built hot water system money can buy. A little pricey compared to the competition but its quality built and engineered in Japan. Have as long a hot shower as you want. Strong Reliable little unit with no issues yet, 3 years in. Will never go back. Show details ·  1

Very low pressure – Purchased this unit on recommendation from plumber after my old storage unit died. Pressure from this unit is atrocious. Shower at 1 end of the house goes completely cold mid shower and you have to turn off the cold water then wait for hot to come back. If you want to use two appliances like the kitchen sink and a shower.... forget about it. Positive is it never runs out of hot water. Definitely should have gone for another storage unit. Show details

Best gcf i ever used – Previous dux heater used 45 kg bottle in 6 weeks only 2 0f us and hot water only thermann is at 11 weeks and still going spot on hot water and easy to use Would absolutely recommend it we are on tank water with pump No problems whatsoever Rex f Show details

Thermann 16 – This unit is very efficient at delivering hot water within 15 Seconds.There is little water temperature fluctuation unless another person opens another tap.Overall i would say this unit is the best so far and would not go back to hydropower. Show details ·  1

Very happy with this unit – One month in since I installed the Thermann 6* 16L and I'm very pleased. I only need to wait around 15-20sec to have a very hot water in the shower (@60C), I don't experience any water temp' fluctuation, and the water flow is steady. the only reason I gave it 4*and not 5* is because you can't change the temperature without buying the R/C for an… Read more

extra $100.(which I didn't buy)

Please note, the system is for serving two people with minimal use( showers and a bit in the kitchen ), the distance from the unit to the shower is around 8 meter, and to the kitchen is around 4 meter.

The installation was straightforward and cost $1100 including the unit.

Absolutely crap – Constant waste of water. From every outlet I have to wait ages for any hint of hot water with the cold turned off. The temperature also fluctuates still with the cold off. Sometimes it doesn’t even kick in and send hot water, I’ve had to go and turn the unit off and on again. Another waste of my money thanks to a plumber highly recommending it. Very very disappointed  Show details

Agree wholeheartedly with Worst Item Ever – So much water is wasted to actually get hot water. Bought this thinking it would be more economical, stupid decision. Used to be able to have a 5 minute shower, now to get 5 minutes of water at a perfect temperature I am standing there for at least 25 minutes. Shower goes cold after about 3 minutes. No good just trying to adjust the hot water tap.… Read more

Have to completely turn the shower off and start again - so again you're wasting litres of water to get hot water. Our gas bill is also now a lot more!

Thermann 6* 20L C/Flow 50DEG NG – Very pleased with the Thermann 6* 20L C/Flow 50DEG NG unit. The installation is for a small cottage with 1 bathroom. All kitchen , laundry and bathroom outlets within 14 feet of the heater. The install took about 5 hours and included the removal of the DUX electrical off-peak tank and changes to plumbing pipes in that area. I am new to the 50C hot… Read more

water regulation, but the water seems hot enough to wash dishes in and the shower is comfortable to bath in and flow seems fine. I did have the water saver shower rose removed and a standard rose fitted to the shower, it is an 8 litre per minute WELS shower head. The all up cost was $2192.20 which included $220 for a level 2 electrician to remove the off peak meter from the meter box and $126.50 for the electrician to install the outside power point and terminate, in a block ,the off peak power line.

Only want a good shower – I thought that it wasn't very good for the first two years, terribly bad pressure in the shower, good every where else, I had taken out shower head restrictor didn't seem to make any difference,, finally found another restrictor at the inlet, goodness two of them, my shower is now perfect  Show details

I think we fixed the problem – We are on a rural property, not on mains water. We changed the pump and I think we've now fixed the problem - thankfully. I couldn't have lived with the system the way it was. All good now.

Problem with hot water in the Kitchen – I just purchased a continuous flow hot water system and while it works ok in the shower (you do have to wait awhile for the hot water to kick in and you need to ensure that only the hot water tap is turned on) but the flow of hot water to the kitchen is not regular enough to be able to wash dishes in hot water. You waste a small sink's worth of… Read more

cold water waiting for the hot to kick in and then the water is only tepid to warm when rinsing dishes as you wash. So by the time you finish washing the dishes - the sink if full of lukewarm water and you are effectively washing and rinsing all your dishes in lukewarm water. I questioned the plumber about this and he claims: 1. no one has ever complained about this before; 2. It's now law that the hot water temperature must be set to 50C so he can't do anything about the water temperature; and 3. therefore there is nothing he can do to fix the problem. Any answers please? Had I known this before I bought the unit, I would never have bought it and I can't imagine anyone else would want to wash their dishes in lukewarm water either. Help!

Worst item ever – So much water is wasted to actually get hot water. Bought this thinking it would be more economical, stupid decision. Used to be able to have a 5 minute shower, now to get 5 minutes of water at a perfect temperature I am standing there for at least 25 minutes. Shower goes cold after about 3 minutes. No good just trying to adjust the hot water tap.… Read more

Have to completely turn the shower off and start again - so again you're wasting litres of water to get hot water. Had an elderly relative stay who needs a shower chair, she had to bathe at the neighbours - she would either have 3rd degree burns or be frozen at our house. Continuous hot water - what's that?????