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Since tankless water
heaters have practically no
storage capacity and they
only heat water after flow
is detected, the heating
elements must be sized to
meet the maximum
expected water flow
demand of the house.
Tankless water heaters
are often specified by their
BTU ratings and by
listing the temperature rise
expected for a steady flow
rate of water.
Specifications indicate
what outlet temperature a
heater is capable of raising
the input water
temperature at a steady
flow rate.The last digit
in our product number
signifies the number of
elements in that particular
tankless hot water heater.
Residential Products
When deciding which Tankless Water Heater to purchase, you will also need to consider where you will need hot water. Are you looking for a unit that will heat the water at one sink (single point application), an entire bathroom (multipoint application), or an entire house, apartment, or condo (whole house application)? It is important to recognize the number of fixtures that will require hot water. Each fixture will have its own demands. The chart below illustrates the typical flow rates (demand) for some standard fixtures: However, fixtures as in showers with multiple showerheads or whirlpool baths may require considerably more flow of hot water.
H-12-2
H-14-2
H-16-2
H-16-4(1-70)
H-16-4(2-40)
H-18-4
H-24-4
H-28-4
H-28-4-South
H-36-6
The flow rate is especially important, since Tankless Water Heaters will generate a temperature rise based on the flow rate demanded. The larger the unit, the higher the temperature rise. For a tankless water heater supplying domestic hot water, two specifications are required to properly determine the rating of a heater that would be adequate. The first is the temperature rise necessary based on the inlet water temperature expected. The second specification is the flow rate in gallons per minute (See GPM chart above) expected for the hot water. See our Temperature Rise Chart below.
This is an estimate and is based upon normal shower heads.
Check manufacture for all other shower heads.
Next, you should look at your incoming water temperature. If you live in a cold climate, your incoming water temperature will likely be much lower than if you live in a warm climate, like Florida. Your best bet is to find out how much temperature rise you will need in order for your hot water to reach the desired heat. If the incoming water temperature for your shower is 65°F, you are using a 2.0 gpm shower, and you want to raise that temperature to 115°F, you will want to look for a Tankless Water Heater that will provide at least a 50°F temperature rise at 2.0 gpm (115°F - 65°F = 50°F). However, if you anticipate additional simultaneous demand, such as the hot water from a sink being used while someone is showering, you will need to add the sink’s gpm to the shower’s gpm in order to determine your overall gpm demand and then find the temperature rise necessary to meet your overall needs.
We make units that will accommodate 110V, 120V, 208V, 220V, 240V, and 277V. Different Electric Tankless Water Heaters will have various requirements in amp draw. You will want to ensure that you can support the electrical demands of your Electric Tankless Water Heater. You must ensure that you have a circuit or circuits that will support your Electric Tankless Water Heater. It may be necessary to put your Electric Tankless Water Heater on its own circuit or circuits.
If you are on well water, go one zone higher in ordering.
CHECK THE BREAKER SIZE CHART
MAKE SURE THAT YOU HAVE BREAKER SPACE
AVAILABLE IN YOUR BREAKER BOX BEFORE ORDERING
(you may end up needing to add an additional panel)
H-12-2
H-14-2
H-16-2
H-16-4(1-70)
H-16-4(2-40)
H-18-4
H-24-4
H-28-4
H-28-4-South
H-36-6
Q u i c k
Reference Buying
For your convenience for
individual applications
Dishwasher:
Zone 1 or 2 - Model H-12-2
Any Zone - Model H-14-2
Any Zone - Model H-16-2
Lavatory:
Zone 1 or 2 - Model H-12-2
Zone 3 or 4 - Model H-14-2
Any Zone - Model H-16-2
Laundry Tub or Machine:
Zone 1 - Model H-14-2
Zone 1 or 2 - Model H-16-2
Zone 1,2,or 3 - Model H-18-4
Shower - 1 head:
Zone 1 - Model H-12-2
Zone 1 or 2 - Model H-16-4
Zone 1,2,or3 - Model H-28-4
Any Zone - Model H-36-6
Shower - 2 heads:
Zone 1 - Model H-24-4
Zone 1,2, or 3 - Model H-28-4
Zone 1,2, or 3 - Model H-36-6
Any Zone - Model H-36-6
Kitchen Sink With Dishwasher:
Zone 1 - Model H-12-2
Any Zone - Model H-14-2
Any Zone - Model H-16-2
Half Bath with Shower
and Lavatory (No Bath Tub):
Zone 1,2,3 - Model H-16-4
Zone 1,2,3 - Model H-16-4
Zone 1,2,3 - Model H-18-4
Any Zone - Model H-24-4
Proper installation and
maintenance of your
Tankless Water Heater
can optimize its energy
efficiency.
To validate your warranty,
you must have a licensed
plumber or electrical
contractor install your
Tankless Water Heater.
• Single Point Application A single point application is one where only one fixture will require an Electric Tankless Water Heater.
• Whole House Indoor Use Larger Whole House units are designed to serve an entire house, apartment, condo, or cabin, where multiple points of use will exist.
TANKLESS INC. 2040-A Whitfield Park Avenue, Sarasota, Florida, USA 34243
Phone: 1-800-TANKLESS 1-800-826-5537 Fax: 941-755-6529