We have lived in our current home (my grandparents home) for 8 years now, and we just recently updated our kitchen. In the update, we removed the small hot water tank that was under the kitchen sink. We felt it was an electrical drain and took up quite a bit of space.

Well, since removing it, the water that comes to the kitchen sink doesn't get hot enough for my liking. All other sinks and faucets get hot enough water, even the half bath that is the furthest from the water tank.

We are on a slab. I wonder if that is why my grandparents installed the water tank originally, they had the same issues.

Is there a way to correct this or do we need to put another hot water tank under the sink?