Boiler Upgrade for 100m2 House - Comparing CO, SSC, ACV, Immergas Models

Hello,

I was browsing through this forum and searching a lot on the internet about highly effective CO and SSC gas boilers, but I only have a confusion about it, hence the request for help in choosing.

I have a 100-meter house to be heated, in a mixed manner: partly brick, partly wooden, with a floor on joists.
Wall insulation is 10 cm ceiling

When it comes to SSC, I have one bathroom, but the household (3 people in total) like baths and the current furnace (junkers Eurostar ZWE 24) heats through flow.

I would like to replace the boiler with a more efficient, cheap in operation and durable (I heard that ACV or Immergas are good and have a 5-year warranty), and also provide greater comfort of using DHW. I was thinking about 2-function, hanging stoves, perhaps with a built-in tank, within 6-7 thousand. It won't be easy for me to find a place to put the tank next to it.

A cordial request for advice on the brand, model, or solution to the issue of whether 1 or 2 functions.

Good day.
Privately, I have a single-function Junkers (open COMBUSTION chamber) and a 60-liter DHW tank.
The furnace has been operating since 2002 without major problems (cleaning once a year).
House 120m2 + 35 m2 garage. It works so far.

We have a 2-function Immergas Victrix Zeus with a built-in tray (6-8l).
CO works fine, but DHW sometimes fails. After work, there is a noticeable drop in temperature in the shower with greater reception (130 m2, 2 bathrooms).

A good tray is a cool thing, it gives a buffer.
Maybe newer furnaces don't have such problems anymore.

Termet Ecocondens Integra II with a power of at least 2.8-25 kW with a built-in 45 lt storage tank. I installed and launched them with 15 zst without problems.

serwo66 wrote:

Termet Ecocondens Integra II with a power of at least 2.8-25 kW with a built-in 45 lt storage tank. I installed and launched them with 15 zst without problems.

Interesting proposal, thank you. It's just that the boiler costs 10,000 according to the price list ... On the net like from 5,500, but I'm not sure if exactly the same model. They offer a long warranty, so I will definitely take that into account
Any other suggestions, gentlemen, or opinions about Termet boilers?

dragon10 wrote:

Good day.
Privately, I have a single-function Junkers (open COMBUSTION chamber) and a 60-liter DHW tank.
The furnace has been operating since 2002 without major problems (cleaning once a year).
House 120m2 + 35 m2 garage. It works so far ..

Thank you. As I mentioned, I am not able to find a place for the tray, unfortunately, and I estimate that it should be twice as large (about 120l) so that it is really worth taking seriously

As a colleague wrote earlier, you have a Termet Integra 25 boiler. Its overall dimensions (height x width x depth) are 815x795x410 mm.
You also have the option of hanging a 1-function boiler, e.g. for comparison, Termet Gold Plus 20 with dimensions of 750 x 400 x 349 mm + next to it you hang a container with a 100 l Biawar Quattro coil with dimensions (1033 x 506 x 501 mm) and with slightly larger dimensions you have the entire heating center taken care of. And yet - the boiler only needs 20kW, so you can safely throw the flue gases outside through the wall.

And what do you think about such a proposal: Beretta MYNUTE BOILER GREEN 25 BSI, also with a tray?
Its power range is 6 - 25, but I do not know if it is worth having an even smaller power, like Termet Integra?

For 3 people, instead of combining with storage tanks, it is proposed to consider the installation of a combi oven with a decent large exchanger and there will be no problem with DHW.

tomek3108 wrote:

For 3 people, instead of combining with storage tanks, it is proposed to consider the installation of a combi oven with a decent large exchanger and there will be no problem with DHW.

tomek3108 wrote:

For 3 people, instead of combining with storage tanks, it is proposed to consider the installation of a combi oven with a decent large exchanger and there will be no problem with DHW.

It will most likely be so. However, choosing a boiler is not that easy
I am currently considering the aforementioned 2, i.e. Beretta Boyler Green 25 and Termet Integra 25

The lower the minimum power - the better. Then the boiler adapts better to the heat demand, especially during the periods: the beginning of the season and the end of the heating season - when the demand for heat is the lowest.
A weather regulator with an external temperature sensor should be connected to the condensing boiler, then the boiler works with the lowest boiler water temperature needed at a given moment, and the lower the water temperature, the greater the condensation phenomenon and greater savings.

ls_77 wrote:

The lower the minimum power - the better. Then the boiler adapts better to the heat demand, especially during the periods: the beginning of the season and the end of the heating season - when the demand for heat is the lowest.
A weather regulator with an external temperature sensor should be connected to the condensing boiler, then the boiler works with the lowest boiler water temperature needed at a given moment, and the lower the water temperature, the greater the condensation phenomenon and greater savings.

Ok that's clear. I am simply wondering if the difference between 3 and 6 kW of minimum power is really significant?

It is known that the boiler is chosen your whim, but from what I see, Termet EcoCondens Integra II 25 costs 10,000 without a discount, so I personally would prefer to buy something from Buderus or Junkers (the same Bosch capital group) and instead of a 45l tray on the wall next to the boiler large 26-plate DHW exchanger. When choosing, make sure you have any sensible service of the selected company in the area "just in case"

Do not look at the list price: Termet Ecocondens 25 Integra II
And I prefer an exchanger with a coil than a plate exchanger, which is more limescale.
I am always betting on a solution: a hanging boiler + a tank with a coil (even of the smallest capacity). Vaillant has this solution with a 75 l container that is hung next to the boiler - it has the same housing as the boiler, so two identical devices hang next to each other - but the price, unfortunately, as from outer space.

Ok, thank you for your help and I'm closing the topic