That's indeed an Ariston on-demand similar to your current Stiebel, sir. Common faults are caused by calcification of everything...from the trigger, to the flow restricting tubes & the heating element. Once clogged, there won't be enough volume nor pressure to make the heater turn on.
You guys up north aren't on limestone bedrock like our neckodawoods. Water here is super hard. Softeners are a necessity to keep plumbing in constant good service. The on-demand won't have your luck nor half the longevity here.....I hope you can pardon the drama, sir.[emoji120]
Note: Bosch & Ariston share a few identical storage heater models.
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