Hubbell Electric Heater ETX User Manual
Model ETX Tankless
Safety Fixture Tankless
Electric Water Heater
Provides Tepid Water for Emergency Fixtures
Available up to 162 KW in All Three Phase Voltages
Features
■
Heavy Duty Construction
� Constructed with high grade materials
to ensure long operating life
� Simple to specify and easy to install and operate
� Factory packaged heater provides trouble-free
installation and operation
� NEMA 4 construction standard
� Low pressure drop
■
Reliability
� Engineered for your specic application
to ensure reliable operation
� Wide selection of sizes to meet the needs of even
the most demanding application
■
� On demand heating eliminates costly and
cumbersome storage tanks
� Instantaneous design reduces stand-by heat loss
and signicantly lowers operating costs compared
to traditional storage systems
Model ETX Tankless
he Mo
T
electric tankless water heater that is 98% + efcient and is
easily installed and operated.
del ETX Tankless is a compact wall mounted
Products marked with the Lead-Free logo comply wi
Drinking Water Act (SDWA) requirements of a weighted average of
less that 0.25% lead content on wetted surfaces of pipes, pipe
fittings, plumbing fittings and fixtures.
Tankless Water Heater For Tepid Water Delivery
The Hubbell model ETX Tankless electric water heater is
a highly reliable and easily maintained heater designed
for operation in a commercial or industrial application.
The Hubbell ETX Tankless heater is compact, extremely
efcient, takes up minimal space, and reduces operating
costs. Hubbell’s vast experience, meticulous engineering
and advanced technology ensure that you can rely on the
model ETX for your water heating needs in even the most
demanding and critical applications. The Hubbell Tankless
is the right choice for your tepid water requirements, as you
will be providing your customer with a quality product that is
long lasting, trouble-free and energy efcient.
ASME
UM
Over 200,00 btu/hr
th the Safe
Hubbell ETX
Product Information
The Hubbell ETX Electric Tankless Water Heater provides high volume tepid water for safety drench systems with ow rates
as high as 40 gpm. The heater contains high powered heating elements that heat water only when there is demand for tepid
water. When tepid water is needed, a built in ow sensor measures the exact ow rate, and that data combined with temperature
readings at the heater’s inlet and outlet are processed by the electronic temperature controller. This data is continuously
transmitted to the temperature controller, which constantly calculates the precise amount of power (kW) needed to achieve the
desired temperature. A zero cross over ring signal is sent to the fast acting triacs in order to modulate the heating elements
to the precise level needed to meet demand. The Hubbell ETX heater uses only as much power as is needed, while delivering
accurate and consistent tepid water temperature.
Heater Overview
12 Element Unit Shown
NEMA 4 Control Panel
Suitable for wet applications
Main Circuit Breaker
Control Transformer
Step down transformer
240 volt control circuit
Digital Display
Electronic temperature
controller is adjustable
in 1° increments
With through door handle
Power Distribution Block
Single point electrical connection
Magnetic Contactor
Fully disengages the heating element
in a fault condition
Tepid Water Outlet
Drain Ports
Simplies maintenance
Flow Meter
Measures the exact
ow rate
Cold Water Inlet
Orientation:
Voltages:
Phase:
kW Range:
Power Factor:
Thermal Efciency:
Inlet/Outlet Size:
Min/Max Flow: Approvals:
6,12 & 18 element 24-162 kW
2 & 3 element 8-27 kW
Wall Mounted
208 thru 600 Volt 50/60 Hz
or 3
1
Φ
Φ
8kW - 162kW
0.999
98% +
2 & 3 element 8-27kW ¾" sweat
6, 12 & 18 element 8-27kW 1" sweat
0.5 GPM Min, 40 GPM Max
0.2 GPM Min, 8.0 GPM Max
Design WP:
Design TP:
Elements:
Standby Power:
Heating Chamber
Warranty:
Electrical Warranty:
Enclosure:
Solid State Switches
Modulating heating elements 0-100%
to ensure accurate and consistent
temperature and long element life
Commercial Quality Heating Elements
Incoly sheathed for long life
Heating Chamber:
All copper and bronze construction
150 psi
300 psi
Incoloy 800
< 3 Watts
5 Year
1 Year
NEMA 4 enclosure suitable for wet
applications
ASME on units over 58kW
Recovery Rate Formulas
GPH x x 0.00244 = KW
KW x 410
2
÷ GPH =
KW x 410 ÷ = GPH
Technical Features
Temperature Controller
A sophisticated electronic temperature controller with LED digital display provides the user interface. The temperature controller
processes all ow and temperature data and calculates the precise amount of power needed to meet demand.
Operator Control Capabilities
✓
Power Limiting:
✓
Diagnostics:
Allows the operator to reduce the power consumption by any percentage to provide installation and
operational flexibility and savings.
Display inlet and outlet temperatures, flow rate and error codes to assist in troubleshooting.
✓
Cost Calculator:
✓
Temperature Control:
Determine the exact cost of operating the heater. Input your cost per KW·Hr and the controller displays
total KW·HRs consumed, total cost of operation, and total hot water usage (shown in gallons or liters).
Set the digital display to the desired water temperature in °F or °C. Fully adjustable in 1° increments
from 3
2-104°F (0-40°C). A user adjustable +/- 3° calibration feature provides additional control for
superior accuracy.
Full Heater Modulation
Each heating element is switched on/off using a fast acting solid state triac with zero cross over ring control. This switching schema
provides full modulation of each heating element, ensuring that the precise amount of heat is added to meet demand. To improve
operating efciency and component longevity, each triac is mounted to a heat sink located on the incoming supply piping so that heat
generated by the triac during the switching process is dissipated into the water.
Proper Power Integrity
All Hubbell tankless water heaters, including all 3 phase models, are engineered to operate as a balanced load and operate at 0.999
Power Factor. All Hubbell 3 phase models are designed for 3 wire (3 live, 1 ground) and 4 wire power systems and draw equal current
across all conductors to maintain the power integrity of the users electrical system. Hubbell does not recommend the use of heaters that
operate as an unbalanced load, as is common with staged heaters designed for star systems (3 live, 1 neutral, 1 ground) that require use
of the neutral leg. All load switching in Hubbell tankless models is performed as zero cross over, eliminating phase angle ring interference
and associated EMI issues.
Full Resource Staging
The Hubbell tankless control schema ensures that usage is equalized across all heating circuits. To achieve this, once the controller
has calculated the precise amount of kW required, all circuits are energized in a staggered fashion such that each circuit is proportionally
and independently energized and then time staggered between circuits. This Full Resource Staging Schema reduces EMI output,
increases component longevity, and provides highly accurate and consistent hot water temperatures. For three phase models, all circuits
are fully modulated and synchronized to operate as a balanced load.
Building Management Integration
Remote Control: Ability to remotely enable or inhibit the heating operation of the unit using one of the following two methods:
1. Customer supplied 24VDC signal is user congured for either Inhibit Mode or Normal Operation Mode.
2. Customer supplied volt free contact is user congured for either Inhibit Mode or Normal Operation Mode.
Priority Control: An integrated SPDT potential free dry contact (NO/NC 10A @ 240VAC) energizes when the unit is heating and
de-energizes when not heating. This feature is useful when it is desirable to give the water heater priority over
another electrical load to ensure that both are not operational at the same time.
Options
A. Type 316L stainless steel heating chamber for added
corrosion resistance.
B. Special construction features. Please consult factory.
C. Inlet and Outlet Valve assembly simplies installation
and includes unions, shut offs, check valve,drain
ports and pressure relief valve.
D. Heating chamber built to ASME Section VIII and "UM"
stamped.
E. NEMA 1 enclosure for general purpose locations.
F. Floor mount enclosure option.
G. Emergency stop button, located on control
panel door.
H. Remote Control Display allows the heater to be installed in a remote
location. The 3" x 5" NEMA 4 display enclosure can be located up
to 250' from the heater and gives the operator full remote control
and monitoring capabilities.
I. Explosion resistant construction for installation in a hazardous
location. Standard is class 1, Division 2, Group B. If application
requires other please specify Class, Division and Group rating
required.
J. UL Listed package.
K. Outdoor weather package, for use in outdoor installations.
3
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