introducing invensys / robertshaw’s new range of water
Post on 25-May-2022
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Introducing Invensys / Robertshaw’s New range of water heating thermostats “ST” Hot Water Thermostats
This new design thermostat (Black Body) will be introduced to replace the discontinued range of “EWT” Thermostats (Grey Body). These ST type thermostats
are more compact in size, responds quicker to temperature changes and still fits existing mounting clamps.
** Important Note ** When fitting the new ST (black body) thermostats from the discontinuedEWT (grey body) units, some changes to the wiring will be needed. The new ST thermostats
do NOT have identical wiring to the EWT series. Refer to the new wiring diagrams below, alsonew diagrams will be in all packaging and available on request.
Stokes No Replaces Dial Color Temp RangeST1201 ST1201113, W1M2/70 DK GREEN Adj 50°70°C Diff 412
EWT1L25085, W1M2503 #######W1M25085, W1M25034 #######
ST1205 EWT1L2501, WIM2/80 PINK Adj 60°80°C Diff 412
ST1205113, W1M25018 #######W1M25069, W1M2513 #######W1M2501
ST2201 EWTL2601, W2M2 DK GREEN Adj 50°70°C Diff 412
WM2601, WM26010 #######
ST1002 EWT1701KS, W1 DK BLUE Adj 50°80°C Diff 412
EWT1, EWT1701 #######ST1006 EWT1703KS, W1/93 PURPLE Adj 60°90°C Diff 412
EWT1703, W1703A #######
ST100660°90°C (Purple Dial)
ST100250°80°C (Drk Blue Dial)
ST220150°70°C (Drk Green Dial)
ST120560°80°C (Pink Dial)
ST120150°70°C (Drk Green Dial)
Note ST22 to be connected in this configuration only and
it’s set temp shall be lower than ST12
Picture showing reverse side of thenew ST thermostat and BiMetal disks
WARNING:1. ALL WIRING OF THE THERMOSTAT SHALL CONFORM TOAS3100 & IS TO BE INSTALLED BY A LICENSED ELECTRICIAN.2. ELECTRICALLY ISOLATE THERMOSTAT FROM MAINS SUPPLYBEFORE DISCONNECTING. FAILURE TO DO SO CAN RESULT INAN ELECTRIC SHOCK
ST Series Water Heating Thermostats
WARNING:1. ALL WIRING OF THE THERMOSTAT SHALL CONFORM TOAS3100 & IS TO BE INSTALLED BY A LICENSED ELECTRICIAN.2. ELECTRICALLY ISOLATE THERMOSTAT FROM MAINS SUPPLYBEFORE DISCONNECTING. FAILURE TO DO SO CAN RESULT INAN ELECTRIC SHOCK
ST Series Water Heating ThermostatsStokes Part No: ST1201
Surface Thermostat 50°C 70°C
ST1201Replaces:W1M2/70EWT1L2513EWT1L2513NEWT1L2513LEWT1L2540EWT1L2523
StampedST1201133
WARNING:1. ALL WIRING OF THE THERMOSTAT SHALL CONFORM TOAS3100 & IS TO BE INSTALLED BY A LICENSED ELECTRICIAN.2. ELECTRICALLY ISOLATE THERMOSTAT FROM MAINS SUPPLYBEFORE DISCONNECTING. FAILURE TO DO SO CAN RESULT INAN ELECTRIC SHOCK
Old EWT series (Grey Body) Old EWT Wiring Diagram
Dark GreenDial
Differential 4°12°C
ST Series Water Heating ThermostatsStokes Part No: ST1205
Surface Thermostat 60°C 80°C
ST1205Replaces:W1M2/80EWT1L280KSEWT1L2501EWT1L2501NEWT1L25018
StampedST1205113
WARNING:1. ALL WIRING OF THE THERMOSTAT SHALL CONFORM TOAS3100 & IS TO BE INSTALLED BY A LICENSED ELECTRICIAN.2. ELECTRICALLY ISOLATE THERMOSTAT FROM MAINS SUPPLYBEFORE DISCONNECTING. FAILURE TO DO SO CAN RESULT INAN ELECTRIC SHOCK
PinkDial
Old EWT series (Grey Body) Old EWT Wiring DiagramDifferential 4°12°C
ST Series Water Heating ThermostatsStokes Part No: ST2201
Surface Thermostat 50°C 70°C
Old EWT series (Grey Body)
ST2201Replaces:W2M2EWT2L280KSEWT2L2601
StampedST2201133
Dark GreenDial
Note ST22 to be connected in this configuration only and
it’s set temp shall be lower than ST12
Old EWT Wiring DiagramWARNING:1. ALL WIRING OF THE THERMOSTAT SHALL CONFORM TO AS3100 & IS TO BE INSTALLEDBY A LICENSED ELECTRICIAN.2. ELECTRICALLY ISOLATE THERMOSTAT FROM MAINS SUPPLY BEFORE DISCONNECTING.FAILURE TO DO SO CAN RESULT IN AN ELECTRIC SHOCK
Differential 4°12°C
ST Series Water Heating ThermostatsStokes Part No: ST1002
Surface Thermostat 50°C 80°C
WARNING:1. ALL WIRING OF THE THERMOSTAT SHALL CONFORM TOAS3100 & IS TO BE INSTALLED BY A LICENSED ELECTRICIAN.2. ELECTRICALLY ISOLATE THERMOSTAT FROM MAINS SUPPLYBEFORE DISCONNECTING. FAILURE TO DO SO CAN RESULT INAN ELECTRIC SHOCK
Old EWT series (Grey Body)
ST Series Water Heating ThermostatsStokes Part No: ST1006
Surface Thermostat 60°C 90°C
ST1002Replaces:W1EWT1701KS
StampedST1002130
ST1006Replaces:W1/93EWT1703KS
StampedST100130
Dark BlueDial
PurpleDial
Old EWT seriesWiring Diagram
Differential 4°12°C
Differential 4°12°C
ST Series Water Heating ThermostatsStokes Part No: STCOVER
Protective Coversuits ST type Thermostats
Clips onto inside edge of mounting bracket after Thermostat is installed.
WARNING:1. ALL WIRING OF THE THERMOSTAT SHALL CONFORM TOAS3100 & IS TO BE INSTALLED BY A LICENSED ELECTRICIAN.2. ELECTRICALLY ISOLATE THERMOSTAT FROM MAINS SUPPLYBEFORE DISCONNECTING. FAILURE TO DO SO CAN RESULT INAN ELECTRIC SHOCK
Stokes Part NoSTCOVER
Examples showing ST1201 withW1M2/23 Mounting Bracket
Adjustable Dial
Reset Button
Underside view
Cover clips onto mounting bracket edgewith thermostat installed.
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