Tankless water heater needs replacement?

What about it?

Dear reader/plumber Last year we bought and renovated an apartment . There already was a condensating tankless water heater in it. But after a little research it looks to be in the age range of 12-15 years, and it's service history is unknown. It's a De Dietrich mcr 24/28 mi plus . I already descaled it, took 70% appart and cleaned every piece I could get my hands on. And we had a technician over to check if my cleaning was ok, and to ''recalibrate'' it. Now the question is, when do you change a boiler like this? How to check if it's not working like it should and just costing us more money then it should? The following graf is from taking a normal bath and the second spike is washing my hair. The unit also provides underfloor heating.

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Hyenas are famous for their laughter-esque howls, but that is only a small part of their very diverse vocabulary. They make a wide array of sounds, including low whoops to call packmates. A 2022 study discovered that these whoops are actually unique to every individual; no two hyena sounds alike.

Cat Burglar after your catnip stash

🥦🥬🥒🥑🫑🌶️🍋

i think they don't like pronouns

Seriously…

Once they see this, those blacks will definitely want to vote for trump! /s