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                GAS WATER HEATER CONTROL VALVES
 110/220R DOMESTIC, COMMERCIAL & RECREATIONAL VEHICLE WATER HEATER THERMOSTAT UNI-KITS®
   110 Series
The Robertshaw 110 Series gas water heater valves were first manufac- tured for the O.E.M. market in 1955. For the last 50+ years, the 110 series has been the definitive gas water heater valve. Over the years, minor product improvements were incorporated, but the valves have remained basically the same. In 1995 Robertshaw introduced the new 220R Series gas water heater valve. The new 220R Series will mount and operate in the same manner as the original 110 Series. The 220R features simplified pilot lighting and easy-to-adjust gas pressure regulator.
                     220R Series
All models feature built-in, non-cycling Energy Cut-Off (ECO) system
to shut off all gas to the water heater in case of excessive water temper- atures. If an ECO has detected an over-temperature condition and has opened, the control will not function and a new replacement will be required. All domestic and RV models have a 160°F temperature high stop. All commercial models have a 180°F temperature high stop. All mod- els have a 51⁄2" sensing element and vary by inlet and outlet size, shank length, regulator type and setting.
Part No Capacity Factory No. Inlet Outlet Shank W.C./Gas Notes 110-202 45K 220RTSP 1/2 Pipe 1/2 Inv. Flare 13⁄8” 4.0” Nat 160° 110-204 31K R110RCTS-PC 1/2 Pipe 1/2 Inv. Flare 13⁄8” LP/Nat 160°
         110-206 38K R110RTSP 1/2 Pipe 1/2 Inv. Flare 23⁄8” 110-326 45K R110RTS 1/2 Pipe 1/2 Inv. Flare 13⁄8”
3.5” Nat 160° 3.5” Nat 160°
                    GAS WATER HEATER CONTROLS
  For Replacement of Gas Water Heater Controls With Built-In E.C.O. (Energy Cut Off).
Single Cycle E.C.O. Set At 195°F.
   Part No
37C73U-170 37C73U-171 37C73U-172 37C73U-173
37C73U-174
404
Factory No. Inlet Outlet Shank W.C./Gas OEM
Temperature Range 70° to 160°F
       37C73U-836 1/2” NPT 1/2 Inv. Flare 1” 4.0” Nat. Rheem 37C73U-274 1/2” NPT 1/2 Inv. Flare 21⁄2” 4.0” Nat. A.O. Smith 37C73U-641 1/2” NPT 1/2 Inv. Flare 21⁄4” 4.0” Nat. A.O. Smith 37C73U-640 1/2” NPT 1/2 Inv. Flare 11⁄4” 4.0” Nat. A.O. Smith
                     Temperature Range 70° to 155°F
37C73U-652 1/2” NPT 1/2 Inv. Flare 11⁄4” 4.0” Nat. A.O. Smith
 Prices subject to change without notice © 1971-2018 w.d. armstrong corp.
 











































































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