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Robertshaw Hot Water Thermostats WM|EWT & ST Wiring & Identification

Robertshaw Hot Water Thermostats WM|EWT & ST Wiring & Identification

If it's a hot shower that gets you up and going in the morning, you're not alone, there is nothing worse than cranking up the hot water to get a cold shower! Questions that spring to mind 1) did the kids take a two-hour shower last night and leave the tap running as well? 2) did I pay the electricity bill? If the answer is no to both, then it's probably the hot water service that's the culprit.

plumbonline have cross-referenced the 100's of old Robertshaw thermostat codes and married up with the new ST range of electric water heaters surface mount hot water thermostats, so all you need to do is find the WM, EWT or ST number on the thermostat and punch it into plumbonline's search bar on our web site, i.e if you have an EWT1L2-540NZ our selector will give you the new model an ST12-70K. plumbonline ship Express Post so you'll be back in hot water ASAP!

The new Robertshaw range of hot water storage thermostats ST's (Black) are the new change over kits to replace the discontinued ranges WM & EWT (Grey) thermostats. The ST's are the latest generation from Robertshaw with a couple of extra features, they are more compact, and have a faster reaction time to temperature changes in the hot water tank. The new ST range can be installed with the original mounting clamps, if yours has rusted away, plumbonline have new Robertshaw mounting clamps in stock, ready to ship Free Express Post!

A question our team are often asked is, "Is the wiring the same?" So here is the answer;

There are a couple of differences to the wiring across the ranges. The WM & EWT v's ST's minor changes are required as they are not identical, but the ST's do perform the same functions, plumbonline have listed online the wiring detail for the Robertshaw hot water thermostat range and each ST change over "kit" comes with a wiring diagram for reference.

Please Note, all wiring of Robertshaw WM|EWT|ST hot water thermostats must conform to the AS3100 standards and be installed by a licensed electrician.

25th Jun 2019 Colin Young

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