1 / 2Draper 13694 Expert 85mm Immersion Heater Wrench
The Draper 13694 Expert Immersion Heater Wrench is an 85mm box wrench described for fitting or removing electric immersion heaters on domestic hot-water cylinders with moulded insulation. Its listed octagonal size and tommy bar make it purpose-specific, so confirm the heater fitting before choosing it.
At a glance
- Heavy-duty box wrench design with a tommy bar, according to the listing.
- Listed for installing or removing electric immersion heaters on domestic hot-water cylinders with moulded insulation.
- The 85mm octagonal size is also given as 3 3/8" AF.
Reference price: £17.90
Price checked: 12 Nov 2026
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Pros and cons
Pros
- The stated 85mm octagonal/3 3/8" AF size gives buyers a specific fitting reference to compare with their heater.
- The tommy bar is identified as part of the wrench design, providing a crossbar-style way to turn it.
Cons
- Its 85mm size and stated cylinder application make it a specialised tool rather than a general-purpose wrench.
Technical specifications
11 specifications| Brand | Draper |
|---|---|
| Model | 13694 |
| Size | 85mm |
| Head style | Box End |
| Size detail | 3 3/8" AF/85mm octagonal |
| Material | Alloy Aluminum |
|---|---|
| Product dimensions and listed mass | 27.6 x 9.4 x 8.4 cm; 500 g |
| Weight listed | 500 g |
| Described application | For the installation or removal of electric immersion heaters fitted on domestic hot water cylinders with moulded insulation. |
|---|---|
| Handle | With Tommy Bar |
| Number of pieces | 1 |
What to know before buying
Listing details to confirm
The listing gives the product dimensions as 27.6 x 9.4 x 8.4 cm; 500 g, while another feature line states an item weight of 499 g. Confirm the expected weight if that small discrepancy matters. Match the 85mm octagonal fitting and intended cylinder application before purchase.
Who is it for?
A good fit for
- DIY users or tradespeople working on domestic hot-water cylinders with moulded insulation, where the immersion-heater fitting matches the stated 85mm size.
Less suited to
- Buyers seeking an adjustable or general-purpose wrench, or a tool for a heater fitting other than the listed size.
Customer reviews on Amazon
- 5 stars
68% 68% - 4 stars
28% 28% - 3 stars
4% 4% - 2 stars
0% 0% - 1 star
0% 0%
Aggregate customer ratings lean positive, with most ratings in the four- or five-star categories and a smaller three-star share. That is a favourable overall signal, but ratings alone do not show whether users had matching 85mm heater fittings or explain the reasons behind their scores.
Frequently asked questions
What size is the Draper 13694 wrench?
The listing gives 85mm and describes the size as 3 3/8" AF/85mm octagonal. Check that this matches the heater fitting.
What is this wrench intended for?
It is described for installing or removing electric immersion heaters fitted on domestic hot-water cylinders with moulded insulation.
Does it have a tommy bar?
Yes. The feature details state that it comes with a tommy bar.
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