Which stove to choose, Vaillant ecotec Pure 226, Vaillant ecotec Pro, Buderus GB

Hello all.
I received 3 quotes for building a boiler room. I have no idea which stove to choose, because there is little information on the Internet on this subject.
1. Vaillant ecotec Pure with tray
2. Vaillant ecotec Pro with 150l biawar
3. Buderus GB062 with Buderus s100 / 5 hopper

To my knowledge, it appears that the Vaillants have a stainless steel exchanger and the Buderus are made of aluminum and silicon. This is where my knowledge actually ends. On the Internet I read that AlSI cannot be cleaned very well, but is more durable, and stainless steel can be cleaned but is less durable. What to choose? Some posts were old so maybe something has changed regarding ALSI cleaning? On the other hand, this Buderus furnace is a new design, so you don't know how failure rate. I have both services next to me and I do not know what will be cheaper to use. Both boilers of better companies, so the prices of parts are probably similar, so what are the differences?

As for Vaillant - if there is no big difference in price, take PRO.
More intuitive display and guts like in previous PLUSs.
In addition, PRO has a power from ~ 5.7kW, and PURE from 7.2kW.
PRO should have two more service and connection valves, and PURE is "bare".
The best - depending on how much you can add - take the PLUS model from the Vaillant - it has the widest modulation range, eg VC 206 / 5-5 starts up to 4.2kW. In addition, if you manage to buy a Vaillant package (PLUS boiler + VIH tank), you still have a whole set of boiler-tank connections here, in PRO and PURE there is no such thing and you have to add all the hydraulic fittings!

I don't know Buderus.

ls_77 wrote:

As for Vaillant - if there is no big difference in price, take PRO.
More intuitive display and guts like in previous PLUSs.
In addition, PRO has a power from ~ 5.7kW, and PURE from 7.2kW.
PRO should have two more service and connection valves, and PURE is "bare".
The best - depending on how much you can add - take the PLUS model from the Vaillant - it has the widest modulation range, eg VC 206 / 5-5 starts up to 4.2kW. In addition, if you manage to buy a Vaillant package (PLUS boiler + VIH tank), you still have a whole set of boiler-tank connections here, in PRO and PURE there is no such thing and you have to add all the hydraulic fittings!

I don't know Buderus.

Thank you for your answer.
And how is it with these exchangers? Is it true that the stainless steel exchanger is more reliable?
Regarding the Vaillant stoves, thank you for your valuable tips. My circle has narrowed to two performers.
When it comes to the surcharge, it's hard to say, because the first specialist was, when I still had the old concept of rooms with my wife, and the second was after the new concept. What changed? What was suggested by the ecotec pure stove, was calculated as a dual-function one and with a floor heating in 2 rooms. The one proposed by ecotec pro is an option with a biawar and already with a floor covering in 3 rooms, so the cost cannot be compared. 1 specialist 24,000, the second specialist 30,000 but the difference is due to a more expensive stove, a tray and one more floor heating, although the specialist number 1 does in copper and the other in pexes without joints.

You mention a lower starting power, but does it matter for me? Mixed system, 5 radiators and 3 underfloor heating, all powered at low temperature, a two-family house with a basement from 1900 without thermal insulation, 125 m2, I live on the ground floor, heated basement, the neighbor warms overhead, rooms height 3.60 m, new triple-pane windows. A specialist number 2 said that in such a house there is no point in looking at a low minimum power.

PRO should have two more service and connection valves, and PURE is "bare".
What is it for? Does it make any difference to me?

As for these kits, thank you for your advice, it is very valuable.
I have to stay in the amount of 30 thousand, I am still considering whether a single or dual-function oven, there are two bathrooms, but the children are one and two years old, so no one uses the bathrooms at the same time. Only in a few years it will take place, maybe then it will be a change of the furnace and then invest in a single function with a storage tank?

Hello,
The simplest, therefore, the most durable solution is always a single-function boiler (preferably hanging) with a container "next to". When you look after the anode, the biawar tray will serve for several years, and the new one costs about PLN 1,500. He did not throw away the cash in 2-funk. today and in a few years, ie "tomorrow", throwing it out and inserting a single-function (in old boilers it was easy to convert 2 into a 1-function, but today it is practically impossible).
Greetings

Very valuable information. And as for the exchangers in the furnace and what material they are made of? What about circulation? Is it worth it or is it a waste of energy? I have about 5m to the bathrooms and 15m to the kitchen. I wonder if I should make an electric flow water heater for the kitchen so as not to draw water.

Like a colleague Szczecin62 he wrote, I am also a supporter of 1-function boilers with a tray. Much greater comfort of using DHW, and better for the boiler.
If you want DHW circulation, then only to the tank - possibly to a boiler with a built-in tank. Now the installation of DHW circulation is "standard". If you don't do it now, you won't do it later without a general overhaul. The cost of the pipes and fittings themselves is negligible. At the beginning, you can not install the DHW circulation pump, but you will always have options: I want circulation - I put the pump on, I do not want - I close the valve. Even later, when reselling the house / apartment, it is always an additional advantage.

As for the exchangers - I will not say much. I deal with stainless steel and somehow I do not complain about them.

With this circulation, it realizes that this is a good solution from a comfort point of view. He considers it the same as a bucket in terms of profitability. So far, the tray is better comfort for me, but higher costs. I thought the same about the circulation. The tank + circulation is a minimum of 2 thousand. in the purchase + energy losses, and then more maintenance and replacement of the anode, and only at the price of a little better comfort. Now I have a Vaillant combi oven and it works for 10 years, serviced every season. It is used by 7 adults in two apartments and heats 200m2 of apartments on 3 floors. The cost of the furnace was PLN 4,000. and sometimes only when two families are bathing, someone has to let go because only one has warm water. This is because there are two families. Now the stove will be for one family and we will not bathe at the same time, so I was in favor of the dual-function stove all the time, but since the argument was made that the single-function stove will last longer, this is something that appeals to me. It is a pity that no one knows about the AlSi exchanger because this Buderus furnace looks good and the price is the same and Buderus probably gives more things for this price. Minimum power 2 kW, weather at this price, control from the phone at no extra charge because the module is already there, but I'm afraid of this stove. I do not know if it is better to use a flow electric water heater in the kitchen because it is only for washing hands and fruit and vegetables and why circulation? Same for washing hands in the bathroom. It is best to connect the canister only to the bathtub and shower, but it costs 400 PLN for a heater. My dad says that he will give a lot, think and go crazy, but that's how I do and I like to be aware that I don't throw money down the drain. And will anyone tell me what does it mean that the stove has better automation? Why is it because I often hear that choose this or that model of the stove because it has better automation.

I am at this stage too.
I opted for ACV. Apparently, it is the most durable thing that can be.
The rest is just a brand and the guts are the same.
We will see how it will be mounted.
Look because there were a few topics in the forum about ACV.

Mark'o wrote:

I am at this stage too.
I opted for ACV. Apparently, it is the most durable thing that can be.
The rest is just a brand and the guts are the same.
We will see how it will be mounted.
Look because there were a few topics in the forum about ACV.

I also read that they are good quality / price boilers, as well as immergas. The problem is that each specialist recommends the brand of the boiler in which he feels good, i.e. usually 1 or 2 companies, because this is what they learn. There were 3 professionals at my place and each asked if I had a specific stove. When I was talking about the immergas, everyone gave their own for the evaluation. It is also known about the later service and permissions for the first run. I would have to go to an immergas in my city and get a furnace with an installation from them, but how do I know how they do? I had 3 specialists on recommendation and I know they do well, so I decided to choose one of them and I will have Vaillant. Also a good choice but it was cheaper. A good specialist now, who still has a free date, is a treasure, that's why I made such a compromise.

gutozaur wrote:

I had 3 specialists on recommendation and I know they do well, so I decided to choose one of them and I will have Vaillant.

But I also have a similar just said that it has to be ACV and that's it. He also wanted to press something else (ditrich because he works with such a service technician). But I told him that he was making boiler rooms and the boiler was being hung by a service technician from the boiler.

Instead of the GB062 boiler, I would recommend GB072. The exchanger is the same, Aluminum-silicon, but it differs significantly in automatics. Full weather control and the boiler has additional pump outputs, e.g. for a manifold, circulation pump. All automation support is all from one RC300-RC310 controller.
When it comes to better automation in the boiler, more intuitive, easier to use, the possibility of expanding it with modules (mixers, solar, internet)
When it comes to the available power of the boiler, it is 14/20 / 24kW
Definitely a single-function boiler with a container "next to"

If we compare the exchanger made of stainless steel and aluminum, it differs significantly. If there is an old installation, I would recommend rinsing it well, because the exchanger acts as a desilter, The flow drops significantly through the exchanger, the water slows down and if it grabbed something from the installation, rust or other muck settles in the exchanger, add a burner, a small water flow and a hole is made it's hard to weld and the costs are flying.
The buderus alu-silicon exchanger has much larger water flow spaces.

Well, I have already decided on Vaillant. Mainly due to the material of the exchanger. In addition, this specialist made a dual-function Vaillant for me 10 years ago and runs for 7 people and 200 m2 of heating. In addition, the price was the same as in Buderus gb062, so it was the exchanger that decided. Interestingly, the expert in Buderus counted on pexes and when I asked how much more expensive in copper he said 30%. In turn, from Vaillant he does in copper and when I asked how much in pexes he said 10% more. This is the best proof that every professional does what he or she feels good at. It's hard to find someone who can handle everything the customer wants, but it's also hard to know all the furnaces.