Process for Heater Replacement in Ariston SG 30 OR PL Water Heater: Identifying Correct Models

Hey.
I have a small problem - I would like to replace the heater in my old Ariston SG 30 OR PL water heater, but none of the heaters I found on the Internet match the one I took out of the inside. To begin with, I put a photo of the rating sticker:

And here are photos of the removed heater:

The main differences I noticed were:
- the heater is bent into the letter V (those from the Internet are U-shaped), although I do not exclude that it could bend back by itself after years of work,
- it lacks one tube that has internet versions (marked with an arrow in the picture below). I do not know what it is for and whether its presence will not disturb.
Here is a typical heater from the Internet:

The question is: could anyone replace such a heater in the same model and can I easily buy this online version that differs from the one removed from the heater?

Hello. I don't think you will get such an Italian heater. I think this one will be appropriate instead of this Italian heater. Link

PITERRR wrote:

Hello. I don't think you will get such an Italian heater. I think this one will be appropriate instead of this Italian heater. Link

Thanks for the link. I will check the dimensions and if it fits, I will consider the purchase.

Connects under the topic. How to get to the heater? You can see it through the panel, but it will not come out through the hole.

yomek_qtno wrote:

Connects under the topic. How to get to the heater? You can see it through the panel, but it will not come out through the hole.

The heater is tightened to this oval part with an Allen key screw. There are videos of heater replacement on YouTube. A week ago I replaced the thermostat and heater in Ariston 50l from the blue series. I wasted more time cleaning the tank after using it for 4 years than screwing and screwing a new heater with a thermostat.

MZ, if the socket with the seal matches the dimensions and power, then order the one from the Internet. It is possible that they do not produce this model anymore and it is simply a replacement model. The tube you pointed to is the place for the temperature sensor that probably occurs in newer models.