# Timeguard NTT08 7-Day Slimline Electronic Immersion Heater Timeswitch

The Timeguard NTT08 is a slimline electronic timeswitch for programming an immersion heater across a seven-day schedule. It offers four daily on/off periods, a timed boost and battery-backed settings, making it suited to households that want scheduled water heating rather than manual switching.

- [Original product page](https://bargainpostbox.co.uk/product/timeguard-ntt08-7-day-immersion-heater-timeswitch)
- [View offer](https://bargainpostbox.co.uk/visit/timeguard-ntt08-7-day-immersion-heater-timeswitch)
- Market: UK
- Language: en-GB
- Currency: GBP
- Brand: Timeguard
- Model: NTT08
- Category: Tools & Garden > Electrical & Plumbing
- Price: 31.44 GBP
- Previous price: 36.99 GBP
- Discount: 15%
- Price checked: 2026-11-14T19:27:02.199Z
- Rating: 4.4 / 5
- Reviews: 191

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## At a glance

- Set the same schedule every day or programme different switching times across the week, with minute-level switching intervals.
- The listing specifies four on/off periods each day and 28 on/off programmes per week.
- A 1 or 2 hour boost provides extra heating on demand. The override is described as self-cancelling at the next programme change.
- The blue-backlit display and separate mains and output indicator lights show the timer and heater status.
- Rechargeable backup is claimed for up to 720 hours, and the clock changes automatically between summer and winter time.

## Pros

- Seven-day scheduling supports different water-heating routines on different days.
- The boost function provides a short, selectable heating period without changing the regular programme.
- Battery-backed memory is useful during power interruptions, while automatic clock change avoids seasonal manual adjustment.
- Slide cover over the programme buttons helps reduce accidental changes.

## Specifications

### Identity
- Brand: Timeguard
- Model: NTT08
### Electrical ratings and operation
- Supply voltage: 230 Volts
- Wattage listed: 3680 watts
- Resistive load rating: 16A
- Inductive load rating: 4A
- LED lighting load rating: 100W
- Daily programme periods: 4 ON/4 OFF easy-set programme periods per day
- Weekly programme capacity: 28 ON/28 OFF programmes per week
- Shortest switching time: 1 minute
- Boost options: 1 and 2 hour boost button
- Battery backup: 720 hours rechargeable memory back-up
- Clock adjustment: Automatic Summer/Winter changeover
### Dimensions and installation
- Dimensions: 121 x 74 x 42mm
- Mounting: slimline surface mount design
- Cable entry: Back and bottom cable entry
- Weight listed: 0.19 Kilograms
### Materials and protection
- Material listed: Plastic
- Construction: Class I construction
- Ingress protection: IP20 rated for indoor use
### Warranty
- Product warranty: 3 years.

## Before you buy

- Listing specifications are not fully consistent: one feature describes 4 ON/OFF periods per day, while the product description says 4 ON/4 OFF per day and 28 ON/28 OFF per week. It also lists 3680 watts, a 16A resistive rating and 100W LED rating without explaining how the figures relate. Confirm suitability with a qualified electrician. Installation by a qualified electrician is recommended. The listing says Class I construction and states that the unit must be earthed. It is IP20 rated for indoor use.

## In the box

- 1 × Slimline Electronic Immersion Heater Timeswitch (Included)

## A good fit for

- Households wanting an immersion heater schedule that can vary by day of the week.
- Buyers who value a timed boost and visible status indicators on a hardwired timer.

## Less suited to

- Those who need remote or app-based control, which is not listed as a feature.
- Buyers wanting a plug-in timer rather than a surface-mounted installation.

## Customer feedback

Customer feedback describes the timer as easy to set up and programme, with a clear display and useful controls. That aligns with its stated seven-day scheduling, backlit screen and boost button, which may matter to buyers who adjust water-heating times regularly. The supplied feedback does not establish how it performs in every installation, so confirm electrical suitability separately.
- Positive themes: Customers report that setup and programming are straightforward.
- Positive themes: Customers describe the display as clear and appreciate the controls and boost function.

## Frequently asked questions

### Can the NTT08 use a different schedule on each day?
The listing says it can be programmed with the same times every day or with a full seven-day schedule.
### What does the boost button do?
It provides a selectable 1 or 2 hour boost. The listing says the self-cancelling override ends at the next programme change.
### Does it retain settings during a power cut?
The listing claims rechargeable memory backup for up to 720 hours, equivalent to 28 days.
### Does installation require an electrician?
Professional installation by a qualified electrician is recommended. The listing identifies it as Class I construction and says it must be earthed.

## Alternative options

- [Timeguard FST24 24 Hour Digital Fused Spur Timer with Boost, 13A 3kW, Battery Backup, White](https://bargainpostbox.co.uk/visit/timeguard-fst24-digital-fused-spur-timer)
- [Timeguard NTT03 24-Hour/7-Day Compact Electronic Immersion Heater Timeswitch,White](https://bargainpostbox.co.uk/visit/timeguard-ntt03-immersion-heater-timeswitch)
- [Timeguard TS900N 24 Hour Immersion Heater Time Controller, 13A 3kW, Mechanical Plug-In Timer, 24 ON/OFF Settings Per Day, Self-Cancelling Manual Override, 3 Year Guarantee, White](https://bargainpostbox.co.uk/visit/timeguard-ntt08-7-day-immersion-heater-timeswitch)
- [LOWENERGIE 24hr Mechanical Wall Timer Switch – 16A Hardwired Control for Immersion Heaters, Lighting, Fans & Energy Storage Systems \(3000W Max Load\)](https://bargainpostbox.co.uk/visit/timeguard-ntt08-7-day-immersion-heater-timeswitch)
- [Smart WiFi Fused Spur Timer Switch for Immersion Heaters, Electric Towel Rails, Storage Heaters & Lighting - 13A Timer Switch with Power Monitoring \| Alexa & Google Voice Control \| No Hub Required](https://bargainpostbox.co.uk/visit/timeguard-ntt08-7-day-immersion-heater-timeswitch)
- [HBN 24 Hour Indoor Energy Saving Mechanical Immersion Heater Segment Timer Switch with Waterproof Cover, White, 16 Amps](https://bargainpostbox.co.uk/visit/timeguard-ntt08-7-day-immersion-heater-timeswitch)

## Add-ons

- [Optimum Energy Saving Electronic Time Switch - 2 Hour Electronic Boost Timer Socket Box Mount - White, One 230 V](https://bargainpostbox.co.uk/visit/timeguard-ntt08-7-day-immersion-heater-timeswitch)
- [Timeguard Suretime STBT4 2 Hour Electronic Boost Timer with LED Countdown, 13A 3kW, White](https://bargainpostbox.co.uk/visit/timeguard-suretime-stbt4-boost-timer)

## Images

![Timeguard NTT08 7-Day Slimline Electronic Immersion Heater Timeswitch — 1](https://bargainpostbox.co.uk/i/8oAGRUAnV0V6b3gfQmwRutpqghYCN-tOQhWA5NryR2h207yvn6M5dqSlPulR0mvtPRNEKf_rCz0LPIrC-WSg3dCbDPN-ZG3vtFlcXFxPBrkKcO7oq1G1OiHk.jpg)

![Timeguard NTT08 7-Day Slimline Electronic Immersion Heater Timeswitch — 2](https://bargainpostbox.co.uk/i/cvzC2XOqNHxBl3-r5YTdvLNmVG-bvCNJMVAafHSL6KRNymOj9OpzHUzuByGaL-dBKqD3es2Vbv6YVZb541BGueUEsVk1oKWU3OFyIRDDevbUzJgLe25-_9WS.jpg)

![Timeguard NTT08 7-Day Slimline Electronic Immersion Heater Timeswitch — 3](https://bargainpostbox.co.uk/i/Bktfr17dwFNXiEV3hmyxHaw2lIEEVt4KryKFJbCOqgLCAKr1-UdI_Vc-OUVZxYWGIGhTK8hQxIciKFWBta7qLRR63Cuo7mX67txo2K2RHi20vOWXY30ObeQJ.jpg)