CESTB340 PLUS 3kw Immersion Heater

Product Code: CESTB 340 PLUS

Product Information


Key features

– For use in water, in domestic applications
– Single thermostat pocket
– product approved by NEMKO – certificate available on request

Technical data

– Material: Incoloy 800
– Loading: 3kW
– Element diameter: 8mm
– Head size (BSP): 1 ¾”
– Temperature range: 65°C Max Op Trip, 90°C Safety
– Voltage: 240V 1-Phase
– Supplied with thermostat


This is a 3kw, 15inch immersed length Incoloy Immersion Heater complete with combined (operating & safety cut-out) plug-in, high temperature range thermostat. The CESTB340 PLUS 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.

Thermowatt RTS-3 3412173 dual function thermostats with a high temperature range can be used with this immersion heater – see our “Thermostats & Controls” section for more details and to purchase these products.


Installation Instructions for CESTB340 plus can be found here.


How to Measure the BSP Thread size of your Immersion Heater:

Once you have measured the thread, use the table below to select the correct BSP size:

£57.01 inc. VAT

SKU: CESTB 340 PLUS Category:

Additional information

Sheath Material

Head Size (BSP)


Thermostat Type

Stat Inches

Element Diameter (mm)

Voltage (V)

Secondary Protection

Length (mm/Inch)

Loading (kW)


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Q: I have a Range Tribune 300 litre cylinder with two Thermtec 3kw immersion heaters installed 10 years ago. One of the immersions units has failed, and I want to replace both at the same time. Is the CESTB 340 plus the right size and configuration of unit to use? DOes it come with everything I need? Is it possible that it is the thermostat that has failed and not the immersion, or are they all the same thing? I want to order ASAP. Many thanks. Ian Durbin
— Asked by Ian durbin on October 31, 2016
A: Afternoon Ian, Thank you for your question, we don't manufacture range cylinders we would only produce immersions, we wouldn't know their specifications, we would need to know the model of the elements in there already or go to range and get specifications, Kind Regards, Phil

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