Specification Sheet

General Recommendations
†
For gas, electric or oil-fired storage water heaters between
180,000 to 205,000 BTU/Hr. rating: Use ¾" Series 40, 140
tested under ANSI Z21.22 with ratings as certified and
listed by CSA.
For gas or oil-fired storage water heaters between 205,000 and
730,000 BTU/Hr. rating and for compliance with applicable water
heater labeling requirements: Use 1" 40, 140, N240 Series
tested under ANSI Z21.22 with ratings as certified and
listed by CSA.
For installations of gas or oil-fired hot water supply boilers over
730,000 BTU/Hr. output heating domestic water and for steam
coil storage water heaters: Use Series 340, 342 tested under
ANSI Z21.22 with rating as certified and listed by CSA.
SPECIAL MODEL: No. 340X-8 M4Z 1½" size only. Pressure set-
ting 175psi (5.2 bar). Temp. 210°F (99°C). Certified by CSA only.
Direct Side Tapping
For External Flue Heaters
Use extra length extension
thermostat to extend into
water storage tank.
For Internal Flue Heaters
Use short or standard length
thermostat. Vertical discharge
line must be installed with its
direction downward.
Max. 6"
(152mm)
For Heaters with
Direct Top Tapping
Use standard or extra length
extension thermostat.
ES-40-140-240-340 1429 © 2014 Watts
USA: T: [phone] • F: [phone] • Watts.com
Canada: T: [phone] • F: [phone] • Watts.ca
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THERMOSTAT DIMENSIONS
MODEL INLET X
OUTLET
LENGTH
(BELOW INLET THREAD)
HEIGHT
(LESS
THERMOST
AT)
WIDTH WEIGHT CSA
TEMP. STEAM
**ASME PRESSURE STEAM RATING BTU/HR
Rating BTU/HR @75psi set pres. @100psi set pres. @125psi set pres. @150psi set pres.
in. in. in. in. lbs.
40L-3 ¾ M x ¾ F 3 5
5
⁄8 2
5
⁄8 1¾ 180,000 778,000 998,000 1,218,000 1,438,000
40XL-5 ¾ M x ¾ F 5 5
5
⁄8 2
5
⁄8 1¾ 205,000 778,000 998,000 1,218,000 1,438,000
40XL-8 ¾ M x ¾ F 8 5
5
⁄8 2
5
⁄8 1¾ 205,000 778,000 998,000 1,218,000 1,438,000
140S-3 ¾ F x ¾ F 3 5
5
⁄8 2
5
⁄8 1¾ 180,000 778,000 998,000 1,218,000 1,438,000
140X-5 ¾ F x ¾ F 5 5
5
⁄8 2
5
⁄8 1¾ 205,000 778,000 998,000 1,218,000 1,438,000
140X-8 ¾ F x ¾ F 8 5
5
⁄8 2
5
⁄8 1¾ 205,000 778,000 998,000 1,218,000 1,438,000
40L-2 1M x 1F 2 6¼ 2¾ 2¼ 450,000 1,155,000 1,481,000 1,808,000 2,135,000
40XL-4 1M x 1F 4 6¼ 2¾ 2¼ 500,000 1,155,000 1,481,000 1,808,000 2,135,000
40XL-7 1M x 1F 7 6¼ 2¾ 2¼ 500,000 1,155,000 1,481,000 1,808,000 2,135,000
*140S-3 1F x 1F 3 5¾ 3 2¼ 570,000 1,670,000 2,140,000 2,610,000 3,085,000
*140X-6 1F x 1F 6 5¾ 3 2¼ 670,000 1,670,000 2,140,000 2,610,000 3,085,000
*140X-9 1F x 1F 9 5¾ 3 2¼ 670,000 1,670,000 2,140,000 2,610,000 3,085,000
*N240X-6 1F x 1F 6 6¼ 3
3
⁄8 2¾ 730,000 2,195,000 2,817,000 3,438,000 4,059,000
*N240X-9 1F x 1F 9 6¼ 3
3
⁄8 2¾ 730,000 2,195,000 2,817,000 3,438,000 4,059,000
*N241X-5 1¼ M x 1F 5 7
3
⁄8 3¼ 2¾ 730,000 2,195,000 2,817,000 3,438,000 4,059,000
*N241X-8 1¼ M x 1F 8 7
3
⁄8 3¼ 2¾ 730,000 2,195,000 2,817,000 3,438,000 4,059,000
*340-3 1½ F x 1½ F 3 9
3
⁄4 4½ 7 1,150,000 3,450,000 4,426,000 5,403,000 6,379,000
*340X-8 1½ F x 1½ F 8 9
3
⁄4 4½ 8 1,150,000 3,450,000 4,426,000 5,403,000 6,379,000
*342-3 2 M 1½ F 3 9
3
⁄4 4½ 7 1,150,000 3,450,000 4,426,000 5,403,000 6,379,000
*342X-8 2 M x 1½ F 8 9
3
⁄4 4½ 8 1,150,000 3,450,000 4,426,000 5,403,000 6,379,000
*Standardly furnished with stainless steel thermostat tube. M = Male F = Female
**ASME capacities are steam pressure ratings and do not reflect the CSA temperature relieving capacity of the valves for selection purposes.
†LL40XL and LLL40XL valves with extended inlet shanks should be used for water heaters that have extra thick insulation, Ask for ES-LL/LLL-40XL.
REINSPECTION OF T&P RELIEF VALVE: Temperature and
Pressure Relief Valves should be reinspected AT LEAST
ONCE EVERY THREE YEARS by a licensed plumbing contrac-
tor or authorized inspection agency, to insure that the product has
not been affected by corrosive water conditions and to insure that
the valve and discharge line have not been altered or tampered
with illegally. Certain naturally occurring conditions may corrode the
valve or its components over time, rendering the valve inoperative.
Such conditions are not detectable unless the valve and its com-
ponents are physically removed and inspected. Do not attempt to
conduct this inspection on your own. Contact your plumbing con-
tractor for a reinspection to assure continuing safety. FAILURE TO
REINSPECT THIS VALVE AS DIRECTED COULD RESULT IN
UNSAFE TEMPERATURE OR PRESSURE BUILD-UP WHICH
CAN RESULT IN SERIOUS INJURY OR DEATH AND/OR
SEVERE PROPERTY DAMAGE.
WARNING
!
NOTICE
A relief valve functions in an emergency by discharging water.
Therefore, it is essential that a discharge line be piped from the valve
in order to carry the overflow to a safe place of disposal. The dis-
charge line must be the same size as the valve outlet and must pitch
downward from the valve and terminate at least 6" (152mm) above
the floor drain where any discharge will be clearly visible. For 100DT
Discharge line consult your Watts agent.