condensing boiler, suction cup, low temperature?

[I Citro]

Impressive demonstration Maloche.
On my 12kW boiler, I have to replace the traditional duct with a vertical suction cup of about 4m (between the top of the boiler and the roof).

Do you recommend a particular duct to avoid degrading the performance of the boiler (rigid ?, flexible ?, diameters ?, isolated ?, mark ?, type of roof outlet, ...)

[Capt_Maloche]

thank you, thank you, but the question is not about me

12KW? it's all petiot

it makes you a fresh air flow of 14m3 / h, it would go into a diameter 50mm

it allows you to recover 300W at the big maxi

and you have to connect the fresh air directly to the burner, is this possible?

suction tubes are generally smooth

[I Citro]

thank you, thank you, but the question is not about me

12KW? it's all petiot

it makes you a fresh air flow of 14m3 / h, it would go into a diameter 50mm

it allows you to recover 300W at the big maxi

and you have to connect the fresh air directly to the burner, is this possible?

suction tubes are generally smooth

The question, maybe ... That's the answer that made me quit.
Yes, it's 12kW, and that's good.
In vertical consuit, this is not a problem.
Smooth tube ... I do not know what he will put. What is better.
For the connection of the suction cup, there is no choice, since the condensing boiler is "sealed", I cannot connect the fresh air elsewhere.

[Capt_Maloche]

Suction ducts are usually smooth

12KW, is indeed sufficient, even with DHW production
but the small ones I know are 23KW

what model is it?

[I Citro]

12KW, is indeed sufficient, even with DHW production
what model is it?

A wall-mounted gas condensing boiler Chappée. Model LUNA 3 Prime 1.12 HTE V.
This boiler is only heating. For the ECS, an 3 channel valve will supply the upper exchanger of the 300 solar tank.

The choice of a boiler without production ECS is more economical (2500 € HT posed + VAT 5.5).
I like his control panel / built-in room thermostat that can be removed from the facade to move it instead of the old room thermostat via a two-wire link (or optional radio).