Coffee Machine — Tevilat Kelim

A coffee machine that does not have an internal receptacle, but only an external plastic container, and the water is heated inside it by a heating system using THERMOBLOCK technology, meaning by passing through tubes that heat it — does it require tevilat kelim? How is this different from ordinary pipes in general?
Thank you in advance

Hello and blessings, 

If the tubes that heat the water are made of metal, the machine requires immersion, or completion of its manufacture by a Jew. 

The pipes in the wall are not considered a utensil, and therefore do not require immersion. However, the tubes within the appliance are part of the appliance and require immersion, and they also obligate the rest of the appliance in immersion. 

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