Brochure

7
Basic Sizing Guidelines
The flow rate capacity of tankless water heaters depends on the
temperature difference between the desired output and incoming
water temperature. The flow rate comparison chart and table shown
here summarize the flow rate charts found in the specifications of
each model.
Takagi water heaters are sized according to the peak flow rate
requirements, worst-case temperature-rise scenarios, and types of
applications. Once these factors have been determined, refer to
either the flow rate comparison here or the flow rate charts found
in each model’s specifications. Select the appropriate water heater
as well as the amount of water heaters required.
Match the Unit
to Your Needs
Application designers/engineers can decide whether to size
for full flow, expected flow, or utilize probability models such
as the modified “Hunter Curve.” For large scale applications
such as hotels, apartment complexes and large restaurants,
Hunter Curves are commonly used to estimate the peak flow
rate demand when given the total amount of fixture units
within an application. It is up to the application designer/
engineer to determine the amount of fixture units within
any given application.
T-KJr2/U
Non-Condensing Units
Condensing Units
Commercial Unit
T-K4/U
T-H3J-DV
T-H3S-DV
T-H3-DV
T-D2/U
T-M50
T-H3M-DV
2.5 Showers
2.5 Showers
3.5 Showers
3.5 Showers
4.5 Showers
7 Showers
5 Showers
3 Showers
2.5 Showers
2.5 Showers
2.5 Showers
2.5 Showers
1.5 Showers
1.5 Showers
4 Showers
3.5 Showers
(Assuming the set point temperature is 120˚F )
Cooler Climates
50°F Incoming Groundwater Temperature
Warmer Climates
70°F Incoming Groundwater Temperature
Capacity - Number of Shower Heads