As their name implies, tank water heaters store hot water in a tank, to be drawn on as needed. The problem with such systems is, "What do you do when that water runs out?"
For example, in a family household of five people, the hot water could run out after only two persons have taken showers. Then, you might have to wait for hours until the water boiler is refilled, not to mention the discomfort of the water suddenly turning cold in the middle of your shower. These situations cannot arise with a Noritz tankless gas water heater because it will never run out of hot water.

Noritz gas water heaters let you use "as much hot water as you need, only when you need it." Conventional tank boilers constantly switch on and off in oder to maintain the tempreratuer of the water in the tank,regardless of whether or not you need hot water at the time.This is a dreadful waste of energy and money. In contrast, Noritz tankless gas water heaters heat water to the set temperature almost instantaneously on demand, without such waste.

A tank boiler is big and heavy. At least, two or three men are required to deliver and install it. With Noritz water heaters, all plumbing and installation processes can be completed by just one person and total labor time can be drastically reduced.

A tank boiler in a garage will always be in the way. For security reasons, space wasting concrete pedestales or car-stopper poles might be installed there. Noritz gas water heaters do not take up anywhere near the same space because it can simply be hung on any wall.A Noritz gas water heater actually requires only 1/15 of the space needed for a tank boiler.