How a Tankless Water Heater Works

Tankless Water Heaters

tank water heater and tankless water heater photos Photos of tank water heater replaced with Tankless Water Heater

Tankless water heaters provide all the hot water you need without a reserve of hot water in a storage-tank.

The benefit of Tankless is less energy consumption, as there is no fuel used to keep the water in a storage-tank hot.  Instead, a Tankless water heater heats only when hot water it’s being used.

According to the U.S. Department of Energy (DOE):

  • If your daily hot water usage is under 40 gallons, a tankless water heater saves 1/4 to 1/3 of the fuel used by a a tank water heater.
  • If your daily consumption is higher than 40 gallons, a tankless water heater will save up to 15% of the fuel used to heat water.

Note: A typical shower uses 17 gallons of water.  The amount of hot water used is determined by how hot the shower water is set to.

How A Tankless Water Heater Works:

tankless water heater diagram

 

 

 

 

 

 

 

 

 

 

 

 

GAS Tankless Water Heater

diagram of electric tankless water heater

ELECTRIC Tankless Water Heater

  • Water heater senses demand for hot water. When a faucet calls for hot water, the heating source (burner for gas and heating element for electric) in the Tankless Water Heater is activated.
  • The Heat-exchanger heats up. Once the energy source is activated, the heat-exchanger inside the unit heats up very fast. The heat-exchanger then transfers heat to the water as it passes through.
  • Water is heated and sent to the tap. As cold water passes through the water heater, it absorbs heat from the heat-exchanger. The heated water is then delivered to the tap.
  • When faucet is turned off Water Heater also turns off.  It restarts when hot water is needed again. After the demand for hot water ends, the water heater turns off until the next hot water demand occurs.

This link takes you to a comparison and demonstration of how a Traditional Tank water heater and a Tankless Water Heater works:

Tank Versus Tankless Water Heater.

Note:  This video is produced by a Propane Gas Supplier.  Both Tank and Tankless water heaters can run on either Propane of Natural Gas.

Tankless water heaters have different capacities (to deliver hot water).  Much like a larger tank water heater, Tankless Water Heaters are rated at how many gallons of hot water they can deliver in 1 minute.  The more bathrooms you have, the higher the delivery-rate (of hot water) you will need.

Whole-House Tankless Water Heaters deliver 2.5 gallons per minute (gpm) up to 5 gallons per minute.  The correct size is determined by the installer, to ensure you always have all the hot water you will ever need.

If your demand for hot water exceeds 5 gpm — two Tankless Water Heaters connected together.  The first unit will heat the water to the point that the water temperature entering the second unit is already high (as compared to the temperature of the water coming into the house from the city’s water line).   This allows the second unit to deliver hot water at a higher rate than it’s capacity (alone) would allow.

 

 

 

 

 

Al’s provides Full-Service HVAC System Maintenance, Repair and Replacement Services on all brands of Air Conditioners, Furnaces and Heat Pumps (including Trane and American Standard).  We perform every service needed to keep your heating and air conditioning system running at its best.

We sell and install American Standard, Coleman and Ameristar — Air Conditioner unit, Furnace and Heat Pump.

Our HVAC Technicians are NATE (North American Technician Excellence) Certified.  They are trained and experienced in providing maintenance and repair of your HVAC System + Installation of new HVAC systems.

Al’s offers Full-Service plumbing.  This includes; clogged toilet repair, water heater repair, water heater replacement for both tankless and tank water heaters, sewer line replacement (under slab or in lawn), trenchless sewer line replacement (in lawn only), slab leak repair, burst pipe repair, repiping, leak detection, water filtration system installation and sales, gas line repair, and gas line installation.

Contact Al’s today to discuss any problem you have with your Plumbing or HVAC System.  We offer appointments at your convenience & are also your Emergency Plumber resource, with 24/7 Emergency Service.  All our Plumbers are licensed and experienced in diagnosing and repairing your residential plumbing.

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Call Al's For Water Heater Service and Replacement

For fast, professional water heater service and repair, give us a call at 972-225-5257 or contact us online.
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