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 specic 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 signicantly lowers operating costs compared

to traditional storage systems

Model ETX Tankless

he Mo

T

electric tankless water heater that is 98% + efcient 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

efcient, 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 efcient.

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

Simplies maintenance

Flow Meter

Measures the exact

ow rate

Cold Water Inlet

Orientation:

Voltages:

Phase:

kW Range:

Power Factor:

Thermal Efciency:

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 efciency 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 congured for either Inhibit Mode or Normal Operation Mode.

2. Customer supplied volt free contact is user congured 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 simplies 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

Heating Capacity and Amperage Chart

Heating Capability in GPM at

KW

Rating

8 2.73 1.8 2 1.3 6 0.91 0.78 0.68 0.55 0.50 0.45 0.39 − − − − 38 −

11 3.75 2.50 1.88 1.25 1.07 0.94 0.75 0.68 0.63 0.54 31 − − − − 46

12 4.09 2.73 2.05 1.3 6 1.17 1.0 2 0.82 0 .74 0.68 0.58 33 − − − 58 −

14 4.78 3 .1 8 2.39 1.59 1.3 6 1.19 0.96 0.87 0.80 0.68 − 34 − − 67 58

16 5.46 3.64 2.73 1.82 1.5 6 1.3 6 1. 0 9 0.99 0.91 0.78 44 39 − − 77 67

18 6 .14 4.09 3.07 2.05 1.75 1.5 4 1. 23 1.12 1.0 2 0.88 50 − 22 − 87 75

20 6.82 4.55 3.41 2.27 1.95 1.71 1.3 6 1. 24 1.14 0.97 56 − − − 96 −

21 7.17 4.78 3.58 2.3 9 2.05 1.79 1.4 3 1. 30 1.19 1.0 2 − 51 25 20 − 88

24 8 .19 5.46 4.09 2.73 2.34 2.05 1.6 4 1. 49 1. 36 1.17 67 58 29 23 115 10 0

27 9.21 6 .14 4.61 3.07 2.63 2.30 1. 8 4 1. 67 1.5 4 1. 32 − 65 33 26 − 11 3

31 10.5 8 7. 0 5 5.29 3.53 3.02 2.64 2 .12 1.9 2 1.76 1.51 86 − − − 149 −

33 11. 2 6 7.51 5.63 3.75 3.22 2.81 2. 25 2.05 1.8 8 1.61 − 79 − − − 138

36 12.28 8 .1 9 6.14 4.09 3 .51 3.07 2.46 2.23 2.05 1.75 100 − 43 − 173 −

40 13.65 9 .10 6.82 4.55 3.90 3 .41 2.73 2.48 2.27 1.95 111 − − − 192 −

42 14.33 9.55 7.17 4.78 4.09 3.58 2.87 2.61 2.39 2.05 − 101 51 41 − 175

48 16.38 10.92 8 .1 9 5.46 4.68 4.09 3.28 2.98 2.73 2.34 133 116 58 46 230 200

54 18.42 12.28 9.21 6 .14 5.26 4.61 3.68 3.35 3.07 2.63 − 130 65 52 − 225

72 24.60 16.40 12.30 8.20 7.0 3 6 .15 4.92 4.47 4.1 0 3.51 200 173 87 − − −

84 28.70 19.13 14. 35 9.57 8.20 7.18 5 . 74 5.22 4.78 4.1 0 233 202 101 81 − −

96 32.80 21.8 7 16.74 10.93 9.37 8.20 6.56 5.96 5.47

108 36.90 24.6 0 18.45 12. 30 10.54 9.23 7. 3 8 6.71 6 .1 5 5.27 300 260 130 104 − −

126 43.05 28.70 21.53 14.3 5 12.30 10.76 8.61 7. 83 7.1 8 6 .15 350 303 152 121 − −

144 49.20 32.80 24. 60 16.4 0 14.0 6 12.3 0 9.84 8.95 8.20 7.0 3 400 347 17 3 13 9 − −

162 55.35 36.90 2 7. 6 8 18.45 15.81 13.8 4 11. 0 7 10.06 9.23 7. 9 1 − 390 195 156 − −

°

30° ∆T40° ∆T60° ∆T70° ∆T80° ∆T100° ∆T110° ∆T120° ∆T140°

20

∆T

o

F Temperature Rise (oF∆T) MAX A mps (at 100% heater output)

3 Phase Voltages 1 Phase Voltages

∆T

208V 240V 480V 600V 208V 240V

4.69 267 2

31 116 92 − −

• Alternate voltages including 277, 380, 415, 440 and 575 volt available. Please consult factory for exact KW availability in these voltages.

Note:

Model NuMber desigNatioN

etX

■

Step 1

Base Model No.

Example: ETX024-3T4

A Hubbell tankless electric water heater rated at 24 KW
with 3 heating elements and powered with 480 volt, three
phase, 60 Hz.

Option Note

Any and all optional equipment for a tankless model heater must be called out in the written

specications. A model number in and of itself does not reect any optional equipment selected.

—

■

Step 2

KW Rating:

8 thru 162KW
(008 - 162)

■

Step 3

Number of
Heating Elements:

2
3
6
12

18

■

Step 4

Voltage / Phase / Hz:

RS = 208-1-60
R = 208-3-60
S = 240-1-60
T = 240-3-60
T3 = 380-3-50/60
T7 = 415-3-50/60
T5 = 440-3-60
T4 = 480-3-60
T6 = 600-3-60

4

Outline Dimensions and Model Selection

Tepid Water

Outlet

Cold Water
Inlet

8 - 54 KW Models (2, 3 and 6 Element)

Front View

6 Element ETX Shown

5"

A

B

3"

25

DIMENSIONAL DATA (inches)

2 Element

A B C D E

20" 14"

21

1

⁄4"

3

21

⁄4" 6"

3 Element

A B C D E

1

21

20" 14"

⁄4" 213⁄4" 8"

6 Element

A B C D E

1

31

24" 18"

⁄4" 313⁄4" 14"

Side View

1

1

26

"

"

2

4

E

11

3

"

16

8"

1

1

"

4

Withdrawal
Space 12"

Pressure Drop: 3 psi @ 8 GPM Dry Weight: 21 Lbs Wet Weight: 21.5 Lbs Shipping Weight: 40 Lbs

selectioN chart

2 & 3 ELEMENT MODEL TYPES

KW

11 ✓ (3) ✓ (2)
12 ✓ (3) ✓ (2)
14 ✓ (3) ✓ (2) ✓ (2)
16 ✓ (3) ✓ (3) ✓ (3) ✓ (2)
18 ✓ (3) ✓ (3) ✓ (3) ✓ (2)
20 ✓ (3) ✓ (3)
21 ✓ (3) ✓ (3) ✓ (3) ✓ (3)

24 ✓ (3) ✓ (3) ✓ (3) ✓ (3)

27 ✓ (3) ✓ (3) ✓ (3) ✓ (3)

KW

24 ✓ (6) ✓ (6)
31 ✓ (6) ✓ (6)
33 ✓ (6) ✓ (6)
36 ✓ (6) ✓ (6) ✓ (6)
40 ✓ (6) ✓ (6)
42 ✓ (6) ✓ (6) ✓ (6) ✓ (6)
48 ✓ (6) ✓ (6) ✓ (6) ✓ (6) ✓ (6) ✓ (6)
54 ✓ (6) ✓ (6) ✓ (6) ✓ (6)

Note: Chart indicates (2) two element (3) three element (6) six element model types

208V 240V 480V 600V 208V 240V

8 ✓ (2)

208V 240V 480V 600V 208V 240V

3 Phase Voltages 1 Phase Voltages

6 ELEMENT MODEL TYPES

3 Phase Voltages 1 Phase Voltages

5

Outline Dimensions and Model Selection

72 - 162 KW Models (12 and 18 Element)

Inlet/Outlet Side View

3

13

"

8

5"

Electrical
Knockout

3

14

4

5

3

"

8

"

1

1

4

Tepid Water

Outlet

"

42"

Front View

(18 Element ETX Model Shown)

Access Panel

Side View

1

3

"

8

−

Cold Water

7

2

"

8

3

"

4

4

Inlet

1

1

"

4

4

3"

3

"

4

30"

3"

Withdrawal

Space 12"

18 Element ETX shown with

access panel removed.

(12 Element ETX available)

12 & 18 KW

KW

208V 240V 480V 600V

72 ✓ (12) ✓ (12) ✓ (12)
84 ✓ (12) ✓ (12) ✓ (12) ✓ (12)

96 ✓ (12) ✓ (12) ✓ (12) ✓ (12)
108 ✓ (12) ✓ (12) ✓ (12)
108 ✓ (18)
126 ✓ (18) ✓ (18) ✓ (18) ✓ (18 )
144 ✓ (18) ✓ (18) ✓ (18) ✓ (18)
162 ✓ (18) ✓ (18) ✓ (18)

Note: Chart indicates twelve element (12) model types and
eighteen (18) element model types

3 Phase Voltages

Pressure Drop: 5psi @23GPM Dry Weight: 210 Lbs Wet Weight: 220 Lbs Shipping Weight: 275 Lbs

6

ISO 9001:200 8

ISO

MadeintheU.S.A.

Master Specication: Model ETX Tankless

JOB NAME

REPRESENTATIVE

ENGINEER

CONTRACTOR

GENERAL

Provide a quantity of packaged type instantaneous electric tankless water heater(s) Model No.
ETX as manufactured by HUBBELL Electric Heater Co., Stratford, CT. The entire unit is
packaged ready for plumbing and electrical service connections.

HEATING CHAMBER

The heating chamber shall be all Sil-brazed copper and bronze construction. (

316L Stainless Steel

). A plastic heating chamber shall not be acceptable. Water heater heating chamber shall be

rated for a maximum allowable working pressure of 150psi. The heating chamber and all electrical controls shall be
completely enclosed in NEMA 4 enclosure suitable for wet/outdoor applications.

HEATING CAPACITY

The tankless heater shall be rated at KW which will heat GPM of water at °F rise
(

° to 85 °F ). Heaters that restrict hot water flow in any way or have a greater than 5psi pressure drop

@ 23 GPM shall not be acceptable.

Optional Specication: Type

ELECTRICAL

The tankless heater shall be designed to operate at volts, phase, 50/60Hz balanced power
and shall draw equal amperage across all phases at all times. For 3 phase heaters, power shall be a 3 wire (3 live,
1 ground) or a 4 wire (3 live, 1 neutral, 1 ground) system that does not require a neutral leg. The heater will draw

amps only when operating at full power. The immersion heating elements shall be high quality incoloy
sheathed and sized to obtain the rated capacity. Each element is to be operated using zero cross over solid state
controls. The heating elements shall be fully modulated from 0-100% to provide precise temperature control through

the full range of ows. A Hi-Limit thermostat with automatic reset shall be factory installed to disconnect each

heating element in the event of an over-temperature condition. An electronic digital display temperature controller

shall be user adjustable in 1° increments in either °F or °C and shall display ow rate, outlet temperature, inlet

temperature and provide error indication.

WARRANTY

Hubbell shall warranty all electrical components against defects in workmanship and material for a period of one (1)

year from date of start-up, and the heating chamber for a full ve (5) years from date of start-up, provided that the

unit is started within three (3) months of date of shipment and installed and operated within the scope of the heater's
design and operating capability. Labor is not covered under warranty. Each heater shall be shipped with a complete
set of installation and operating instructions including spare parts list and approved drawings. All fabrication and
assembly shall be performed in the U.S.A.

OPTIONS

In addition, the tankless electric water heater shall be supplied with the following options:

The Electric Heater Company

Option

Option

Option

Committed to continuous improvement...

Continuing research results in product improvement; therefore specications are subject to

change without notice. For the most updated information, consult the factory directly.

■ P.O. Box 288 ■ Stratford, CT 06615-0288 ■ Phone: [phone] ■ Fax: [phone]

[e-mail]

■ www.hubbellheaters.com

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