Is the lifespan on electric boilers/エコキュート and heated floors, as short as the manufacturers suggest?

Our newly purchases place has an エコキュート, a 2012 (Mitsubishi Diahot SRT-HP37WUZ6.

The home inspector and agent both said to budget for a replacement, which I am doing, but I was astounded these have such a short lifespan.

When asking around about installing heated floors I was further shocked to find people suggesting a lifespan of only a decade?

Does this seem accurate?