Tankless Water Heater Truths

Posted by on Jan 28, 2014 in Tankless Water Heater Repair Nashville, Water Heater Repair Nashville

There is a lot of discuss the pros and cons of tankless water heaters verses tank water heaters. Water Heater Repair Nashville is going to start a conversation on tankless heaters today, explaining some of the claims and discussing the truths. They have advantages and drawbacks over conventional water heaters and it might simply rely on what ones specific use needs are that will figure out which kind of the proper one for ones house.Water Heater Repair Nashville

The basic theory of utilizing a tankless water heater is one of being energy efficient. Water is heated up as it is utilized, and not saved in the large tank of a conventional water heater, regularly heated so it is ready whenever it is to be utilized. Likewise, considering that they can hold on the wall and take up essentially no space at all, they are really useful.

Electrical Usage

Considering that tankless water heaters do need 240 volts of electrical power and around 160 amps to establish, one might need to have ones electrical box upgraded to accommodate the power need of the unit. For instance, and not to obtain excessively technical below, a standard tank water heater has around a 4500 watt heating element, verses 4, 7000 watt elements of a whole-house tankless one.

When it comes to efficiency, According to the Partnership for Advancing Technology in Housing (PATH), and supported by Housing and Urban Development (HUD), “further testing is needed to determine if electric tankless water heaters will match the efficiency of tank-type heaters.”

Appropriate Sizing

Tankless systems are sized by the flow rate measured in gallons per minute (GPM). One will need to figure out when and what ones greatest demand of hot water is to correctly figure out the finest size unit to purchase.

Below is the formula for figuring this out from Keltec Inc:

Flow rate (GPM)
Temperature rise ( T ºF)

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To determine the size and kilowatt rating you need, apply this formula:
“The result of this formula is the maximum kW needed to accomplish your project requirements for on-demand heated water. Other media will vary slightly. This formula is a nearly universal method of calculation for energy input to yield temperature at required water flow.”

Water Quality on the Tankless System

The quality of the water one has in ones house have to be analyzed too in order to get the most out of a tankless water heater. If ones water is high in mineral content, like calcium, they will develop on the coils gradually and minimize the life span of the unit. If the water hardness at ones house is above 11 grains per gallon, a water softener would be recommended. Makers do include de-liming instructions and typically have a caution light on the device to identify when this should be carried out. Nevertheless, keep in mind what the producers warranty covers. If it is just against maker’s defect, this will not cover any repairs required due to ones water quality. In optimal conditions, a tankless system will last much longer than a conventional water heater, which can help justify the higher initial equipment cost and setup costs, but one will have to bear in mind keeping it running correctly to earn back ones investment.

Service and Repair Costs

These expenses are usually higher for a tankless system than a standard water heater, just to have a heads up. Lots of individuals typically do not have their traditional water heater services too routinely (unfortunately) however it is suggested to have a tankless unit professionally serviced when a year.

Instantaneous Hot Water

This ought to not be that huge of a deal, however though manufacturers do market instantaneous hot water. Certainly one understood that it takes a moment for the hot water being heated right away to go through ones hot water pipe to the faucet or shower. Though, if one is just turning on the faucet a little the tankless heater’s burner could not ignite if the faucet is not opened up more. As an example, a flow rate of 1/2 gallons to 2 gallons per minute is required for electric tankless heaters to heat water.

Depending upon the amount of hot water one needs at the very same time, more than one unit will have to be installed. This is simple to do, however certainly increases the equipment costs in the process.

Equipment and Set Up Costs

A typical price range for tankless heaters is around $800 to $1200. A normal storage tank water heater it is around $300 to $500. Set up costs are about $1200 and $300 respectively then too. One will, once more, probably need an electrical upgrade, in addition to a different gas pipe setup (if utilizing a gas tankless heater), and a new ventilation system. An advantage of changing ones water heater with a system just like the existing one is many of these upgrades will not be needed – they are currently st up.

Advantages of Going Tankless

No stored water, which in itself has several benefits. First, if there was to be a leakage with a tank heater, there could potentially be water damage to ones home. Also, one ought to flush the tank a minimum of once a year to keep mineral build up low, however there is the potential for stinky water odor, bad tasting water, and the development of legionella bacteria in the tank if it is not at a high enough temperature. Traditional water heaters take up much even more space too.


Here is what Consumer Reports has found: “Gas tankless water heaters, which use high-powered burners to quickly heat water as it runs through a heat exchanger, were 22 percent more energy efficient on average than the gas-fired storage-tank models in our tests. That translates into a savings of around $70 to $80 per year, based on 2008 national energy costs. But because they cost much more than storage water heaters, it can take up to 22 years to break even longer than the 20-year life of many models. Moreover, our online poll of 1,200 readers revealed wide variations in installation costs, energy savings, and satisfaction.”

The Center for Energy and Environment says that “A 37% savings of water heating energy per household was found for replacing a typical natural draft storage water heater with a tankless one. However, this savings was not enough to offset the high incremental cost resulting in paybacks from 20 to 40 years.”

Finally, the National Rural Electric Cooperative Association concludes that “Tankless water heaters generally aren’t as energy efficient as well-kept tank water heaters. Insulation, temperature setback, timers, and heat traps can all lower energy costs with tank water heaters.”

One point to weigh is that yes, tankless systems will use less gas than a traditional gas water heater which does have its environmental advantages. However, a lot of electrical power is made use of, for electricity takes longer to heat water than gas. And, a lot of electrical power is produced from burning nonrenewable fuel sources.


As with any sort of technology, the field of water heating is ever progressing. Efficiency advances are increasing with standard gas and specifically electric storage tank water heaters. There are various benefits with tankless and traditional heaters that one will should think about. Do not think twice to let Water Heater Repair Nashville know of any concerns you may have in the decision process.

Check out our Tankless Water Heater Repair Nashville page too!