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Learn more by watching our Cookson Controls 20433-3-1 | Hotwater Thermostat Adjustable Universal 50-70 Deg | WIM2 video.
The Cookson Controls 20433-3-1 is a universal surface-mount hot water thermostat for single element electric storage systems, adjustable from 60 to 82 degrees Celsius. The 20433-3-1 carries a manual reset over-temperature safety cut-out, with screw terminals and contacts rated 240V 30A. It replaces Robertshaw and Klixon pattern thermostats fitted to a wide range of Australian storage hot water units.
When an electric storage unit stops making hot water, the thermostat is usually the part that has failed. On solar boosted systems it does the hardest work of any component in the tank, switching the booster element every time stored water drops below the set point. The 20433-3-1 covers that repair with a universal surface-mount pattern that suits single element systems from most Australian manufacturers. Carrying one on the truck saves a second trip when the badge on the tank turns out to be an odd one.
One part number covering most single element storage units keeps van stock simple, which is why the 20433-3-1 is often bought ten or twenty at a time. It lands as a cheaper option than a brand-matched spare and still carries the safety cut-out, so a call-out repair holds its margin. Screw terminals and a surface-mount fixing keep the changeover short: pull the access panel, transfer the wiring, set the dial. That turns an unknown tank brand into a same-visit repair rather than a return journey.
The 20433-3-1 is not suitable for twin element tanks that run a separate thermostat on each element, and it is not a gas or heat pump control. It is a surface-mount thermostat, so it does not fit tanks that require a probe or capillary thermostat in an immersion pocket. Setting storage temperature at the thermostat does not replace outlet temperature control at the fixtures.
Verified Sparky Direct customer reviews: Cookson Controls Hotwater Thermostat Adjustable Universal (20433-3-1)
"Been using these for 40 years or more. Kills the modern stuff" — Gary
"A good cheaper option" — Jason
"All good" — Lyndsay
(WIM2)
The adjustment range runs from 60 to 82 degrees Celsius, set on the dial once the thermostat is fitted and the access panel is off. A manual reset over-temperature cut-out sits above the adjustment range and trips independently if stored water temperature climbs beyond safe limits.
Connecting a hot water thermostat to the element circuit is electrical work and must be carried out by a licensed electrician. The thermostat mounts against the tank surface behind the access panel and lands on screw terminals, so the changeover itself is short once the circuit is isolated and tested dead.
Single element electric storage hot water systems from a wide range of Australian manufacturers, including electric boosted solar storage tanks. It is a Robertshaw and Klixon pattern replacement and supersedes numbers including 20433-3S, 6060607, W1M280 and DY399-33, which covers many older tanks still in service.
The cut-out breaks the element circuit if stored water temperature rises past the safe limit, typically after a thermostat or element fault. It will not restore power on its own. Someone has to press the reset by hand, which forces the underlying fault to be found rather than left running.
Two symptoms point at the thermostat: no hot water at all, or water running far hotter than the dial setting. A tripped over-temperature cut-out usually means the tank has overheated. Confirm the diagnosis with a licensed electrician before replacing parts, since a failed element produces similar symptoms.
One year domestic use and one year commercial use, starting from the invoice date. The warranty method is return to Sparky Direct for assessment. The warranty is void if the product was not installed by a licensed electrician, so keep the installer details with the invoice.
No. The 20433-3-1 controls a single element and is not intended for twin element tanks that run a separate thermostat on each element. It is also not a gas or heat pump control, and it will not fit tanks that require a probe or capillary thermostat mounted in an immersion pocket.
The Cookson Controls 20433-3-1 is available online from Sparky Direct, with Australia-wide delivery to any state or territory including regional areas. Sparky Direct is an Australian electrical wholesaler established in 2005, supplying more than 500,000 customers with transparent trade pricing.
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Warranty starts from Invoice Date
Domestic Use: 1 Year
Commercial Use: 1 Year
Warranty Method: Return to Sparky Direct
These specifications and characteristics outline physical, mechanical, electrical details.
| Brand | |
| SKU | WIM2 |
| Package Weight | 0.095kg |
| TYPE | VALUE |
|---|---|
| Type | Hot Water Thermostat |
| Brand | Cookson Controls |
| Rated Current (A) | 30 |
| Mounting | Surface Mount |
| Voltage (V) | 240 |
| Adjustable Temp | 50-70 |
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