Series 210-5
Automatic Gas Shutoff Valves
Series 210-5 automatic gas shutoff valves are positive-acting energy
shutoff for the emergency temperature protection of gas water heaters.
They are self-contained devices independent of all other operating con-
trols. They provide protection against overheating water in the domestic
hot water supply heating systems by automatically shutting off the gas
supply to the heater in the event that the water temperature reaches
210°F (99°C). Series 210-5 must be manually reset in order to resume
heater service. This feature serves as a warning of malfunctioning of the
normal operating controls. Manual resetting is easily done and does not
require dismantling or replacing of any part of the valve. See “Reset
Button” feature.
This gas shutoff differs from other contemporary design in that Watts
engineers have embodied the time tested Watts auto-thermatic thermal
actuator principle along with a snap-acting trip latch which closes the
valve at a definite controlled temperature.
Models L210-5 M2, LL210-5 M2 and LLL210-5 M2 feature extended
shanks for use with the new generation of water heaters containing
extra thick insulation.
Features
• Seating - Buna N disc to metal seating assures positive seal for
shutting off the gas to burner in the event of high water tempera-
ture conditions.
• Reset Button - After operating from high temperature, the gas
shutoff must be manually reset (opened). Pressing the reset but-
ton in as far as it will go and then releasing, opens the valve and
allows gas to again flow to the burner.
• Trip Latch Assembly - Snap acting latch releases the valve to
closed at a definite controlled temperature. Stainless steel spring
seats valve when trip latch releases valve to closed position
• Thermostat - Operates trip latch in response to water temperature.
Thermobulb, temperature sensitive portion, is at end of extension
tube for accurate response to tank temperature.
Models
210-5 M2 Suitable for water heaters with up to
3
/4" of insulation
L210-5 M2 Suitable for water heaters with up to 2" of insulation
LL210-5 M2 Suitable for water heaters with up to 2
1
/2" of insulation
LLL210-5 M2 Suitable for water heaters with up to 3" of insulation
Specifications
Standard setting: 210°F (99°C)
Extension: Furnished with 5" thermostat extension only.
For Gas Water Heater Applications
ES-210-5
Job Name
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Contractor
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Job Location
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Approval
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Engineer
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Contractor’s P.O. No.
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Approval
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Representative
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Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements, please
contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior
notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
IMPORTANT: INQUIRE WITH GOVERNING AUTHORITIES
FOR LOCAL INSTALLATION REQUIREMENTS
210-5 M2
L210-5 M2
LL210-5 M2
LLL210-5 M2
Thermostat
Reset Button
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