What is a Tankless Direct Vent Water Heater?

Whether you call it a direct vent tankless water heater, demand water heater, or an instantaneous water heater, they all do the same thing.   Since there’s no tank involved, i.e. tankless, they provide hot water only when you need it.  They do not heat the water  and store it before it’s required .

So how does it work? The process is pretty straightforward.  When you turn on a hot water faucet or a tap, water flows into the water heater unit, where a gas powered burner fires up and heats the water as it passes through the unit via a pipe.

The combustion byproducts are routed to the outside via a special vent pipe that’s  designed to remove these exhaust gases while drawing in fresh combustion air that’s fed directly to the gas burner.  This is where the term direct vent comes from  — the exhaust gases are directly vented to the outside.

By providing air for combustion from the outside, the water heater is completely independent from the interior air.  This is a huge benefit if you’ve got a tight, or well insulated home.  The chance of removing interior air at such a rate as to cause the house to achieve a negative pressure is greatly reduced.

One of the main benefits of using a direct vent water heater, specifically a tankless one, is that there is no wait time for the hot water.  It’s produced instantaneously or on demand.  And, it only provides as much hot water as is needed.

Another equally important benefit, is that associated with the lack of heat losses that one normally experiences with a conventional hot water heater that stores the heated water in a tank.  By only heating water as it’s needed, there are no storage losses.  By eliminating these losses, the overall efficiency of the water heating process is increased substantially.  Because of this, energy costs are lowered.  In fact, most manufacturers claim that savings of on average $200/year.

Incoming search terms for the article: