Bride the Second's house had a dinosaur of a hot water tank, which was replaced by a Navian tankless. The major shortcoming was that the heater was at the back of the house, the bathroom towards the front. Even with insulated pipes, the hot water delivered wasn't as hot as we were told to expect. After the installation, we only learned of small tankless heaters placed on these long runs to boost heat. We would have gladly done that as well, had the contractor mentioned it when costing and installing the initial upgrades.