300L Double Coil Boiler: Enamelled vs Stainless Steel - Lifespan and Corrosion Concerns

Hello.

I plan to buy a new 300 liter double coil boiler, but unfortunately I have a dilemma. Enamelled or stainless steel.
Price:
enameled PLN 2,500
stainless steel 4000 thousand

The real difference is PLN 1500
How much stainless steel can have a real-time use guarantee and whether it can actually corrode or become overgrown with deposits that will reduce its thermal conductivity coefficient.
From stainless steel, I would expect at least 50 years.

Steel enamelled, I assume that a well-made one can last up to 20 years.

Searching for answers on the Internet, I did not find a ready-made recipe.
Ask your colleagues for honest opinions.

Hello. Stainless (stainless steel) would be practically speaking with normal
indestructible in use. Of course, the coil should also be made of this steel.

There is a domestic manufacturer of T...ca (I don't know if I can give the name of the company), which in the case of a 300l tank made of stainless steel, and coils also made of stainless steel, gives an 8-year warranty.

Hello. It is known that no one will give a lifetime guarantee, it would be pointless.
If it gives you 8 years, it's still good (a company with prospects for the future)

Hello.

MIRAS-S wrote:

From stainless steel, I would expect at least 50 years...

And what are you basing that on?

Quote:

Stainless (stainless steel) would be practically speaking at normal
indestructible in use.

There are no indestructible things. Why do some manufacturers of stainless steel tanks equip their products with magnesium anodes and give a 3-year warranty? Or why they only give 8 years, and almost everyone gives 10 years for solar collectors?
Tanks are made of sheet metal by welding, those made of stainless steel are much lighter. Welding thin and brittle sheet metal well is a real challenge, and it can be done better or worse.

Hello dear group.

Of course, I know that in order to make a good stainless steel tank, you need to have a lot of knowledge and skills to weld from this fragile sheet, as a colleague mentioned.

Companies that do not give a 5-8 year guarantee for tanks because this is their guarantee, but how would the actual durability of such a tank be for corrosion if it arises, or for example for scale deposition on the walls or water deposits.

I think that the best test of such tanks is the food industry.

If you have met with companies that you think can be recommended that make good enamelled or stainless tanks, please write to the PM. in order not to make surreptitious advertising.

Today, there is no good enamel tank anymore. A sensible choice is a stainless steel tank, even a used one. If it gets stoned, there are ways to flush it out. However, when the enamel falls, only the steelworks is waiting for it. A few weeks ago, called for a breakdown, I found: a 300l tank, enamelled, 2x coil from a well-known Polish company ko .....l fell after a year of operation. A hole in the weld. Such examples can be multiplied. The tendency is this: it has to be cheap and it has to break down because what will the factories do when their goods will be eternal.

Thank you.

Give as many opinions as possible about the tanks poor had better choices.

I know that enamel must be well made and enamel is brittle as on the proverbial pots.

Just a micro pore and the tank will corrode.

At balegro, you can easily find the used containers you want. I recommend you a guy from Jelenia Góra, he only has stainless steel, whatever you want. I used to buy a coat for a client from him, I picked it up personally to see what the guest represented. Recommendable. And the hula tank purchased from him is so nice.

However, I will choose to buy stainless steel because I am not convinced about the electroplating of the steel and its good workmanship.
The enamel tank is not cheap and the 5-year warranty does not convince me, and the cost with two coils is from PLN 2,500.

In addition, the magnesium anode needs to be replaced, which is also the cost of maintaining the tank.

When it comes to stainless steel, there is also a large selection and you can find it at a good price, starting at PLN 3,500.
It should be noted that not all manufacturers include an electric heater and a safety valve, e.g. in Termica, a Polish manufacturer.

Termica has an inspection opening.

At the moment, the price of JOULE - CYCLONE, an Irish manufacturer, is very good.
The boiler is standard equipped with a heater and a safety valve.

JOULE - CYCLONE has no inspection hole.

I would look with an inspection hole, our water is not wonderful unless you live in the mountains.
Recently, I cleaned the 60L acid tank and pulled out half a bucket of 10 liter sludge from it after 5 years of operation.

Piotr77777 wrote:

I would look with an inspection hole, our water is not wonderful unless you live in the mountains.
Recently, I cleaned the 60L acid tank and pulled out half a bucket of 10 liter sludge from it after 5 years of operation.

Of course, I will look for one with an inspection hole because it should be a standard because the tank is to be used for a very long time, cleaning should be every few years.

I wonder if the filters in front of the boiler with replaceable cartridges are able to filter about 90% of impurities from the water.

And one more suggestion.

Are there limescale deposits on enamel and stainless steel tanks?
I talked to the installer and he claimed that he met with scale on the walls of the enamel tank and even removing it with a high-pressure washer did not help.

MIRAS-S wrote:

I wonder if the filters in front of the boiler with replaceable cartridges are able to filter about 90% of impurities from the water.

Don't count on it, the only solution to this is a water treatment plant. It is worth considering such a device because not only the tank will be protected, but also the rest of the devices.
The cost of the station for 4 people is about PLN 2,000.

I bought a stainless steel tank from the German company Bregus. I got a 10 year warranty and the normal price. I just have a tank with two coils for solar collectors.

[quote="Walker29"]Viessmann made very good stainless tanks. Check how many of them are still on the secondary market and they are worth a lot of money.



Maybe on the secondary market anyway, because the prices of new ones are cosmic and much more expensive than termica, not to mention the Chelchowski and also stainless steel. If you buy a used one, I'm curious how much does it cost you? - a year, two three top !!!!

berga wrote:

Hello.

MIRAS-S wrote:

From stainless steel, I would expect at least 50 years...

And what are you basing that on?

Quote:

Stainless (stainless steel) would be practically speaking at normal
indestructible to use.

There are no indestructible things. Why do some manufacturers of stainless steel tanks equip their products with magnesium anodes and give a 3-year warranty? Or why they only give 8 years, and almost everyone gives 10 years for solar collectors?
Tanks are made of sheet metal by welding, those made of stainless steel are much lighter. Welding thin and brittle sheet metal well is a real challenge, and it can be done better or worse.

The only company that makes stainless steel tanks properly is ACV
As one of the two companies in Europe producing stainless steel, it treats welded joints. Since recently, it has offered a lifetime guarantee.

PLN 6,000 for 300 l of capacity is probably an exaggeration, the seller is expensive for 300 l, a German tank with 2 coils PLN 2,998 + shipping, see:
"boiler exchanger tank STAINLESS STEEL 300l 2W"
JOULE CYCLONE parameters as above PLN 3575

Don't confuse stainless with acid-proof. Acid-resistant is stainless, but not all stainless steel is acid-resistant. There are a lot of stainless steel alloys and their quality is not always high. That is why we often get anodes for such tanks. Only a few people wonder why? If something is supposed to be stainless, what the hell do they put on me with anode protection? Also, don't look at the price in the first place. Nobody will give anything for free and if something is cheaper, unfortunately, the manufacturer has saved somewhere.
If you are looking for an acid-resistant tank (INOX 316L) with coils that are also acid-resistant, then in Poland you will only find LAPESA. ACV does only on INOX 304, i.e. stainless steel. Unfortunately, hardly anyone checks such facts and the slogan "stainless steel" is constantly circulating without checking what kind of steel alloy it is. You can't stick a magnet to a real sourdough, which shows that this type of steel really won't stick to the walls. Stainless isn't like that anymore.
In LAPESA you also have an inspection gangway so you can clean any sediment physically without the need for rinsing. The walls of such an undulating tank work when the water temperature changes, so that if a stone appears there, it will be rejected
Of course, such tanks can also be destroyed. First of all, you need to pay attention to:
1. "blading currents". So that they do not destroy the acid-resistant and stainless steel, the installation should be separated from the tank with a material that does not conduct electricity (e.g. a piece of PP or brass).
2. Chlorine. INOX 316 has twice as much protection against these compounds as INOX 304, so watch out for lifetime warranties, because when reading the small print, there are values of chemicals that may be in the water cycle. Then you think you have a guarantee and you find out you don't.
GREETINGS

this exchanger is German, steel 1.4301, or if you prefer 304 (American standard)
available in Poland, so if you want, you can make 500 liters out of 300 l, good welder with tig and flowers...

welcome back
It's just that INOX 304 L is the symbol of 1.4307
You gave ordinary INOX 304 steel. Besides, I don't suggest giving it to an ordinary welder. Improper welds will cause the tank to rot in these places.

I wasn't talking about 304L stainless steel, only about 304 steel
I found an INVESTA catalog with equivalents online
the second thing, in this topic, when it comes to corrosion at the contacts of steel, it is electrolytic corrosion, as someone welds a different type of sheet metal with a different wire,
it was about refining, it was probably about pickling welds with preparations containing hydrofluoric acid, another issue when welding is to provide an argon shield on the other side of the welded sheets, the welder with whom I worked for many years knows his stuff and ate bread from many ovens
and here is a link to the grades of stainless steel
http://www.investa.pl/oferta/stal_nierdzewna_poradnik_tabela_gatunkow.html
...

As you've probably all noticed, the stainless steel itself doesn't make any effect. maybe an advertising effect.
Proper manufacturing, + correct finishing, + correct operation, = lifetime warranty.
There's nothing for free

I do not know why such texts descending on some political issues, since we are talking about tanks. I meant only to state the fact which was also noticed by "Walker29" - steel is uneven.

OKAY. I corrected.

Slightly off topic, but might be useful in this thread.
Well, I'm getting ready to make and install a water dechlorination device.
I have a house 200m from the treatment plant and sometimes I have the impression that more chlorine (hypochlorite) comes out of the tap than water.
I thought about inserting into the circuit already after the meter, a tank similar to an automatic air vent, only with a capacity of about 10l.
It would mainly collect the air pumped to the water supply at the water treatment plant, but the chlorine contained in the water should also be released along with the air.
The problem may be that the vent will be leaking air all the time, so there won't be much surface area for more chlorine to escape from the water.
Does anyone of you know a ready-made and easily accessible device (tank) that would act as an "overgrown" vent and have a structure ensuring continuous flow in the fish, a sufficiently large surface to degas the chlorine from the water. It's mainly about the continuous maintenance (despite venting) of the air cushion that provides the water level in the tank.
I already have a water pressure reducer.

I suggest doing a simple water test first. Then you will know if the chlorine control is actually exceeded.

Gentlemen, I think this stainless steel will withstand it, such a tank will serve for quite a few years. But the problem is in the welds. Nice, also nicely located only its sides, the trail hits I'm talking about the sides of the weld and its edges. with air and spraying with soapy water along the entire length of the weld, bubbles were released until a nice one, even with a small pressure, released on the seam. After some time, a friend called that his neighbor has a sour water boiler and he is leaking if I will weld him. It turned out to be the same leak on the side of the weld along its entire length. The Lord gave a lot of money to serve him for a long time, and here is five years and you have to buy a new one. He decided on enamel and we'll see how much it will serve him.