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Tankless or Demand-Type Water Heaters

Also known as demand-type or instantaneous water heaters, tankless water heaters provide hot water only as it is needed. They don't have a function to produce the standby energy losses connected with storage water heaters, which can save you money. There is a basic information about their technology, whether a tankless water heater might be right for your home, and how to choose the right model.

How They Work
Tankless water heaters heat water directly without the use of a storage tank. cold Water travels through a pipe into the unit, when a hot water tap is turned on, no matter what exactly heats the water: a gas burner or an electric element. Consequently, tankless water heaters deliver ainvariable supply of hot water. There is no need to wait for a storage tank to refill enough hot water. Meanwhile, a tankless water heater's output limits the flow rate.


Water Heaters Applications have to Include:

  • Remote bathrooms or hot tubs
  • Booster for appliances, such as dishwashers or clothes washers
  • Booster for a solar water heating system.

Advantages and Disadvantages
For homes that use 41 gallons or less of hot water daily, demand water heaters can be 24%–34% more energy powerful than ordinary storage tank water heaters. They can be 8%–14% more energy efficient for homes that use much hot water - approximately 86 gallons per day. You can achieve even greater energy savings of 27%–50% if you install a demand water heater at each hot water outlet.
The primary cost of a tankless water heater is better than that of an ordinary storage water heater. Although, tankless water heaters will typically last longer and have lower operating and energy costs, which could offset its higher purchase price. The majority of tankless water heaters have a life probability of more than 20 years. Additionally, they have easily replaceable parts that extend their life by many more years. Contrary the storage water heaters last 10–15 years.

Tankless water heaters can avoid the standby heat losses associated with storage water heaters. Meanwhile, gas-fired tankless water heaters can waste energy if they have a constantly burning pilot light, although they tend to have higher flow rates than electric ones. Compared to a storage water heater, sometimes this can offset the elimination of standby energy losses. In a gas-fired storage water heater, the pilot light heats the water in the tank so the energy isn't wasted.

The cost of operating a pilot light in a tankless water heater varies from model to model. Ask the manufacturer how much gas the pilot light uses for the model you're considering. If you purchase a model that uses a standing pilot light, you can always turn it off when it's not in use to save energy. Also consider models that have an intermittent ignition device (IID) instead of a standing pilot light. This device resembles the spark ignition device on some gas kitchen ranges and ovens.

  • How to choose the best one?

Before shopping, you also need to take into account the following:

  • Size
  • Fuel type and availability
  • Energy efficiency (energy factor)
  • Costs
  • Installation and Maintenance

Right installation and maintenance of your demand water heater can optimize its energy profitability.

There are some factors on installation, which are very important: fuel type, climate, local building code requirements, and safety issues, notably concerning the combustion of gas-fired water heaters. Consequently, it's best to have a qualified plumbing and heating contractor install your demand water heater.

Refining Energy Efficiency

Try some complementary energy-saving strategies to help lower your water heating bills after your demand water heater is correctly installed and maintained. Some energy-saving devices and systems are more cost-effective to install with the water heater.