afstb327 Immersion heater

AESTB327 3kw 11" Immersion Heater

Product Code: AESTB 327

This is a 3kw, 11inch immersed length Incoloy Immersion Heater complete with combined (operating & safety cut-out) plug-in thermostat. This product will often carry the ThermTec brand which is owned and manufactured exclusively by Heatrod Elements in Manchester. The AESTB327 can be used in all standard domestic water areas including normal use in hard water areas susceptible to limescale. If particularly aggressive water conditions are present or the duty/usage is higher than normal then we would recommend a titanium element version which can be priced and manufactured on request.

Both Cotherm TSE00187 and Thermowatt RTS-3 dual function thermostats can be used with this immersion heater – see our “Thermostats & Controls” section for more details and to purchase these products.

This product can also be used to replace product code T11AN.

This product is designed to meet European Standards EN 60335-2-73:2003 +A1:06 + A2:09 used with EN 60335-1:2012 for the safety of electrical appliances that heat liquids for household and similar purposes. Testing has been carried out and the product approved by NEMKO – certificate available on request.

Installation Instructions for AESTB327 can be found here.


£43.20 £36.00 (ex VAT)

In stock


Category: .

Additional Information

Sheath Material

Incoloy 800

Head Size (BSP)


Thermostat Type

Thermawatt RTS-3

Stat Inches


Element Diameter (mm)


Voltage (V)


Secondary Protection


Length (mm/Inch)


Loading (kW)



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FAQs for AESTB327

Q: Hi, my immersion heater has developed a fault. Resistance is 18ohm L-N. >4M Ohms L-E, N-E. I can only assume it is breaking down under voltage. Cabling to the element is fine, MCB trips goes when mains is connected to the element. The element is a Cotherm ELE-11-IN-800-UNV. I was hoping to replace it with AESTB327. Should this be a straight forward swap? Wattage, voltage, length are all the same. I don't know the thread size as the element is currently installed in an unvented tank and ideally I only want to drain it once. Regards, Andrew

A: Morning Andrew, Thank you for your enquiry, please could you confirm the BSP/Thread as we would need to know that to give you an accurate quote, the AESTB 327 will be 2 1/4" BSP, Thanks, Phil.




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