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AeWare IN.THERM 3.8kW Remote Heater

AeWare IN.THERM 3.8kW Remote Heater
 AeWare IN.THERM 3.8kW Remote HeaterAeWare IN.THERM 3.8kW Remote Heater 
Our Price:  £477.50

(Inc. 20% VAT)




3 in stock, immediate despatch


  • Quality Original Part
  • Easy to fit - Plug and Play


Made by Gecko

Manufacturers Code: 0603-421001

This heater is 3.8kw which replaces the 4.0kw heater fitted to many spas.

If the heater is faulty it will come up with a RHNF related error code, to confirm it is the heater, remove the filter, reset the controller inside the heater and switch the hot tub on and off, if the same code exists replace the heater unit.

No spares are available for this hot tub heater, it is is a fully enclosed 1 piece unit.

(Please see other listings for the 2kw version of this heater).

If after reading this you do need more help with heaters or other hot tub parts please get straight in touch.


Manufacturers Code

Part Number:  0603-421001

Product Specification

SKU:  30035
Brand:  Gecko
Length (cm):  36.8
Width (cm):  11.4
Height (cm):  12.7
Material Type:  Stainless Steel
KW:  3.8
Make & Model:  0603-421001

Please note all Hot tub Parts sold are UK Spec, which means designed for 230 V at 50Hz

Related Products

Need More Detail?

At Hot Tub DIY we want to make it as easy as possible for you to repair or build your hot tub, the following guides relate to this product.

For a full list of guides please go to our Articles page and choose a section : Hot Tub Help Articles

Hot Tub Heater Guides

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Delivery Charges

We’ve reduced many of the delivery charges and now offer a better range of options linked to the value of your order. Plus we have included free packaging and handling for all orders.

Some larger Items

Some larger items (for example hot tub covers) come with a delivery surcharge, these are individual costs that only apply to these specific items. Detail of the costs are on the specific item pages and appear in the postage cost.

Liquids and Chemicals

Please note we cannot send liquids and chemicals to anywhere other than main land UK due UK and international Chemical handling laws.

England and Wales

Hot Tub Part delivery

Next Day Delivery

England and Wales (if ordered before 11:59am)(Signed Courier) - £7.50

Orders placed before 12am will arrive the next working day via courier excluding Saturday and Sunday deliveries.

Please call for prices in other areas for a quotation.

Next day delivery hot tub parts

Standard 2-3 days delivery

Delivery England and Wales Only (Royal Mail) - Cost £5.50 (under £50) - Free on orders over £50

Please call for prices in other areas for a quotation.


All other items and areas

The standard charges have been set high to cover extra cost on postage to other areas, so please get in touch for a quotation.

Small Items Only Via Royal Mail - £3.70
Scottish Highlands & Islands - £16
Northern Ireland and Isle of Man - £26.40 (call for cheaper)
Southern Ireland - £18.00 (call for cheaper)
Channel Island - £47.00 (call to arrange)
Please Call or Email if you are outside these areas

Want more detail or help on a AeWare IN.THERM 3.8kW Remote Heater?

Free advice on hot tub parts

Please feel free to ask any questions about this product or other hot tub related items including how to repair, replace and test this item or any other items.

Telephone: 01209 808343


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Please note all Hot tub Parts sold are UK Spec, which means designed for 230 V at 50Hz

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