How deep does the mounting box need to be please - in mm?

It's surface mounted not inset. Depth around 25mm

Can I use it outdoor?

It is not waterproof, so short answer is a definite “NO” (as indicated by its description “Indoor”; there is no mention of IP certification). For external use, it would have to have an IP rating (such as IPXY, where Y=4, or 5, or 6, e.g., IP44 at a minimum for rain protection, and IP46 for higher water protection – Google it).

Would this work for electric underfloor heating?

Yes it will be fine as long as the underfloor heating load is not above 13 amps. Most underfloor heating is well below this as it needs to be cost effective, but just check.

Can the transparent cover be left off ?

It’s probably OK, but the cover is to stop ingress of dust/ dirt which if left off completely might impair the unit operation

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HBN 24 Hour Indoor Energy Saving Mechanical Immersion Heater Segment Timer Switch with Waterproof Cover, White, 16 Amps

Product ID: 60272140

Details

Brand
HBN
Colour
Transparent
Item weight
5.04 Ounces
Material
Plastic
Product dimensions
8.5D x 8.5W x

⏰48 ON/OFF cycles/day

⚡16 Amps load capacity

💧Waterproof cover

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207.61 DT

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Description

⏳ Automate your energy savings—because every minute counts!

HIGH LOAD CAPACITY - Supports appliances up to 16 Amps, ideal for immersion heaters and pumps.
EFFORTLESS AUTOMATION - Eliminate manual switching and reduce energy bills with reliable automatic operation.
VERSATILE APPLICATION - Perfect for heating, lighting, pumps, security systems, and more—your all-in-one timer solution.
PRECISION ENERGY CONTROL - Set up to 48 on/off cycles daily for ultimate scheduling flexibility.
DURABLE WATERPROOF DESIGN - Protect your timer with a transparent waterproof cover, perfect for utility areas.

The HBN 24 Hour Indoor Mechanical Timer Switch offers precise control with 48 daily on/off settings, a robust 16 Amp capacity, and a waterproof cover for durability. Designed for immersion heaters and various household systems, it automates energy use to save costs and enhance convenience, backed by CE certification for safety.

Specifications

ASIN	B074FQ37KX
Best Sellers Rank	13,559 in DIY & Tools ( See Top 100 in DIY & Tools ) 20 in Timers
Brand Name	HBN
Colour	Transparent
Country Of Origin	China
Customer Reviews	4.1 4.1 out of 5 stars (961)
Item Dimensions D x W x H	8.5D x 8.5W x 4.8H centimetres
Item Weight	5.04 Ounces
Manufacturer	Ergo I&E CO.,LTD.
Manufacturer Part Number	1649
Material Type	Plastic
Number of settings	48
Smart Home Compatibility	Not Smart Home Compatible
Unit Count	1.0 count

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207.61 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Tunisia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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