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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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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

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 settings/day

⚡16 Amps heavy-duty load

💧Waterproof cover protection

€ 43.07

Duties & taxes included

In stock

Sold byAmazon NetherlandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⏳ Master your energy, master your day!

BUILT TO LAST - Robust waterproof cover ensures durability in humid or utility spaces.
POWERFUL PERFORMANCE - Supports appliances up to 16 Amps, perfect for immersion heaters and pumps.
EFFORTLESS AUTOMATION - Eliminates manual switching, saving you time and reducing energy bills.
VERSATILE APPLICATION - Ideal for lighting, heating, pumps, security, and more—one timer to rule them all.
PRECISION ENERGY CONTROL - Set up to 48 on/off cycles daily for ultimate scheduling flexibility.

The HBN 24 Hour Indoor Mechanical Timer Switch offers precise, programmable control with up to 48 on/off settings daily. Featuring a waterproof cover and a robust 16 Amp capacity, it’s designed for reliable automation of immersion heaters, pumps, lighting, and more—helping you save energy and streamline your home or workspace with ease.

Specifications

ASIN	B074FQ37KX
Best Sellers Rank	14,832 in DIY & Tools ( See Top 100 in DIY & Tools ) 28 in Timers
Brand Name	HBN
Colour	Transparent
Country Of Origin	China
Customer Reviews	4.2 4.2 out of 5 stars (982)
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 Items	1
Number of Packs	1
Number of settings	48
Unit Count	1.0 count

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