Replacement of a single-function gas boiler with a dual-function one

Hello, I have an old boiler from the 90s installed for heating an apartment in a 3m2 bathroom. I want to replace it with a new dual function. Do I have to take care of any formalities (design, permits, chimney sweep decision) or can I simply replace it without any formalities?

You can exchange without formalities, but there are a few problems. What is the volume of the bathroom? Measure carefully. It looks like you can only install a condensing / closed combustion chamber. As a precaution, I would also ask the chimney sweep for an opinion if someone was connected to your chimney. Do you have an acid-resistant insert in the chimney?

Thank you very much for the hint piotr_boncza! There is no input, the volume of the bathroom is 7.6 m3. Indeed, I have to make a contribution and now the question arises whether I should report it to the community or get any permits? I know that there are different situations with the community and I would not like to expose myself to additional bureaucracy if there is no such need. After all, it is just a modernization of an old installation.

If someone has ever done a fluff it does not mean that everyone will accept it now.

During the next modernization, you must meet all current standards and regulations.
So you will probably need a balaclava opinion so that you can make the appropriate replacement.
Currently, condensing boilers with a closed combustion chamber are popular on the market, moreover, due to the cubature of your bathroom, a boiler with an open combustion chamber is out of the question, but now it is obsolete, so no loss.

If there is a community there and you do not have an acid-resistant chimney liner, you need the formal consent of this community before installing this liner, so submit an appropriate application for approval now. And if it turns out that your flue has been damaged due to the lack of this contribution, the community may charge you for the potential repair, so officially better not admit that you do not have such a contribution.

The description shows that you have an old installation, which is why, before connecting a new boiler, it would be necessary to clean the installation, together with the radiators, of sediment and sludge that has accumulated over the years and probably reduced the efficiency of this installation.
In addition, condensing boilers, in order to achieve the highest possible efficiency, require a slightly lower temperature of the heating water than is the case with an "ordinary boiler", so it may turn out that the old radiators will be a bit too small to take full advantage of the benefits and savings offered by the new boiler .

In total, I do not know if you have approx. 10,000 ready. PLN or more for the entire modernization, because I have the impression that you are not fully aware of the challenges posed by such modernization. It is certainly not Mr. Pikuś in your case

Hello, next year there is a general renovation of the lower floor (floor heating) and replacement or rather liquidation of the boiler (garbage) and replacement of the DHW boiler (or rather heater). We did the old installation with my father and it worked for years but I am fed up with shit from coal and woodwork, and my wife wants a warm floor, hence the plans for renovation and switching to a gas stove. The house is 100 years old, about 120m2, insulated in the 90s, but next year a new façade and insulation of the foundations will be made. Currently, I plan to have 6 underfloor heating circuits and 5 radiators upstairs. I did some research on boilers and I must admit that I honestly thought about Termet Ecocondens Gold Plus 25 (but here is something low efficiency compared to others, so probably higher consumption costs?) And Bosch Condens GC2300W here a higher price ........ like these boilers work, how with failure rate? is it worth paying extra to Bosch? what is the matter of CWU - do you need a container or will it be able to flow now? currently, about 10s and hot water is flowing, to the bathroom - about 4 meters of pipes to the kitchen - about 6.5 meters. Are CO expansion vessels necessary in this case (of these boilers)?

Suchy_PL_ wrote:

I was thinking about Termet Ecocondens Gold Plus 25 (but here is something low efficiency compared to others, so probably higher consumption costs?)

small? ie what you mean, condensing boilers have similar efficiencies, so there aren't any big discrepancies here

Suchy_PL_ wrote:

what is the matter of CWU - do you need a container or will it be able to flow now?

if you take a 1-function boiler, you will have to have a hot water tank, higher cost but better comfort. Or you take a 2-function boiler, you do not need a tray, so lower cost, but the comfort of hot water is worse.

Suchy_PL_ wrote:

Currently, I plan to have 6 underfloor heating circuits and 5 radiators upstairs.

If you can do it everywhere, it is better to have uniform heating, then the problem of controlling it disappears.

I decided on 1F Termet Ecocondens GOLD basic comfort controller tank and now I have a purely technical question .... at the moment the stove will be plugged into the old CO installation from the soot ... the old stove will be cut off with valves and its vessel. With only radiators and a storage tank for this season, is it necessary to install a clutch? I am asking because next year, after a general renovation and floor heating, I wanted to give the AFRISO ACB 910 group