Quick answer: To choose a fridge defrost heater, match four things on your old element: the part number, the wattage, the length and the plug or connector. Then check your fridge model number. Wattage and length are the two numbers that decide most orders. If you are unsure, send us your model number and a photo of the old heater.
Check the heater has actually failed
Before you buy, confirm the heater is the faulty part. Ice on the freezer back wall can also come from the timer or the defrost thermostat. Read how to test a fridge defrost heater, or the fridge defrost system explained.
The 4 things to match
| Match | Why it matters |
|---|---|
| Part number | Identifies the exact heater, for example RF116 or RF153 |
| Wattage | Sets the heat output and the resistance. Do not swap for a different wattage |
| Length | The element must fit the evaporator coil and its clips |
| Plug or connector | Some elements come without a plug and must be wired in |
Step by step: how to choose
- Remove the old heater safely. Unplug the fridge first, then take out the shelves and the freezer back panel.
- Read its markings. Note the part number and wattage if printed on the element.
- Measure the length. Measure the element along its full length and note the shape, for example single or dual pass.
- Check the plug. Note the connector or wiring, and take a photo before you disconnect anything.
- Find your fridge model number. See how to find your fridge model number.
- Compare with the table below, or send us the details through Find Your Part.
Our fridge defrost heaters compared
| Heater | Wattage | Length | Notes | Price (AUD) |
|---|---|---|---|---|
| RF116 | 350W | 440mm | Dual pass, Westinghouse and Kelvinator | $28.50 |
| RF153 | 450W | 520mm | Double pass, Westinghouse and Kelvinator | $29.50 |
| SE114 | 450W | n/a | Side by side, for RS643V and RS662V | $29.00 |
| F&P 322W | 322W | 46cm | Generic, no plug | $28.00 |
| F&P 355W | 355W | 57cm | Generic | $28.00 |
These are replacement parts, not genuine branded parts. Match your old element to the table, and check each product page for the models it is listed for.
What resistance should a good heater read?
At 240V, resistance is voltage squared divided by wattage. Use it as a quick check when you test the old element, and to confirm the wattage you need.
| Wattage | Expected resistance (about) |
|---|---|
| 322W | 179 ohms |
| 350W | 165 ohms |
| 355W | 162 ohms |
| 450W | 128 ohms |
Common mistakes
- Matching the brand only. The same brand uses several heater sizes, so match wattage and length too.
- Ignoring length. A heater that does not fit the coil leaves frost behind.
- Forgetting the plug. Check whether you need a plug, and reuse your old plug and fuses where needed.
- Skipping the tests. A new heater will not help if the thermostat or timer is the real fault.
- Leaving an old thermostat in. If the thermostat is old, replacing it at the same time can make sense.
Safety
Defrost heaters are 240V parts inside the freezer. Unplug the fridge before testing or fitting. Fitting should be done by a licensed refrigeration mechanic or electrician.
Find the right heater
Browse fridge defrost heaters, Westinghouse fridge parts and Fisher & Paykel fridge parts. Need the rest of the defrost system? See defrost timers and thermostats. Orders placed by 6pm Sydney time ship the same business day from Colebee, NSW.
Defrost heater FAQs
How do I choose the right fridge defrost heater?
Match the part number, wattage, length and shape of your old element. Then check the plug or connector and your fridge model number. Wattage and length are the two numbers most buyers need, and both are usually printed on the old heater or in its listing.
Can I use a heater with a different wattage?
No. Wattage sets how much heat the element makes and its resistance. A different wattage can leave frost behind or heat the cabinet more than it should. Always match the wattage of your old element.
Why does length matter?
The element must fit the evaporator coil and its mounting clips. A heater that is too short leaves part of the coil frosted, and one that is too long may not fit. Measure the old element before you order.
What if my heater has a plug or connector?
Check that the new heater has the same connector or note that it must be wired in. Our Fisher & Paykel 322W element is supplied without a plug, so it must be wired in using your original plug and fuses.
What resistance should a good heater read?
At 240V, resistance is voltage squared divided by wattage: about 179 ohms for 322W, 165 ohms for 350W, 162 ohms for 355W and 128 ohms for 450W. A reading of open (OL) means the element has failed.
Should I test the heater before I buy a new one?
Yes. Test the heater, the timer and the defrost thermostat. A new heater will not help if the thermostat or timer is the real fault. See our test guides before you order.