The Heatmiser DS-SB v3 is a flush-mount set back dial thermostat, ideal for anyone wanting a simple but energy-efficient heating control system. Its defining feature is the set back function, which automatically reduces the set temperature by 4°C whenever no time clock signal is present, cutting energy use outside of scheduled heating periods without extra programming.
The DS-SB v3 has been designed to work in conjunction with the Heatmiser UH8 wiring centre and TM4 v2 programmer, but is equally at home as a standalone dial thermostat on other 230V systems. As a flush-mounting design, a back box is required prior to installation.
5-35°C
Temperature Range
4°C
Set Back Reduction
230V
Supply Voltage
3A
Switch Rating
Flush
Mounting Type
CE
Approved
Automatic 4°C Set Back
When no 230V time clock signal is present, the DS-SB v3 automatically reduces the set temperature by 4°C, saving energy outside scheduled heating periods without any extra input from the household.
4-Core Cabling Required for Set Back
To use the set back function, 4-core cabling is required from the time clock to the thermostat. Confirm existing cabling is suitable before installation, or plan for a cable upgrade where needed.
Qualified Installation Required
This thermostat is powered from a 230V AC supply and is flush mounted, requiring a back box. Installation must be carried out by a qualified electrician or heating engineer in accordance with current UK wiring regulations.
Automatic Set Back Function
Reduces the set temperature by 4°C automatically when the time clock signal is off, saving energy without manual adjustment.
Slide Switch Mode Select
A simple slide switch selects between Constant, Off and Time Clock modes for flexible day-to-day control.
Flush Mount Design
A flush-mounting design sits neatly against the wall for a clean, modern finish (back box required).
Remote Sensor Compatible
Supports an optional remote temperature sensor, automatically switching from the internal sensor when one is connected.
Designed for UH8 & TM4 v2
Purpose-designed to work alongside the Heatmiser UH8 wiring centre and TM4 v2 programmer, while remaining compatible with other 230V systems.
CE Approved
Manufactured to CE approval standards for UK and European electrical compliance.
General
Model
DS-SB v3
Product Type
Set Back Dial Room Thermostat
Mounting Type
Flush (back box required)
Set Back Function
Yes - 4°C automatic reduction
Designed For
Heatmiser UH8 wiring centre, TM4 v2 programmer (also standalone)
Electrical
Supply Voltage
230V AC
Switch Rating
3A
Temperature Range
5-35°C
Cabling for Set Back
4-core cabling required from time clock
Controls & Compliance
Mode Selection
Slide switch: Constant / Off / Time Clock
Remote Sensor
Compatible, auto-switches from internal sensor
Certification
CE approved
What does the set back function actually do?
When no 230V signal is received from the time clock, the DS-SB v3 automatically reduces the set temperature by 4°C, rather than switching the heating off completely - useful for maintaining a background level of warmth outside scheduled periods.
Do I need special cabling to use the set back function?
Yes, 4-core cabling is required from the time clock to the thermostat to enable the set back function. Standard 2 or 3-core cabling will not support this feature.
Is this thermostat surface mounted or flush mounted?
The DS-SB v3 is a flush-mounting thermostat, so a back box must be fitted in the wall prior to installation.
What wiring centre does the DS-SB v3 work with?
It's designed to work alongside the Heatmiser UH8 wiring centre and TM4 v2 programmer, though it can equally be used as a standalone dial thermostat on other compatible 230V systems.
Can I connect a remote temperature sensor?
Yes. When a compatible remote sensor is connected, the DS-SB v3 automatically switches from its internal sensor to the remote one, useful for bathrooms or when the thermostat is sited away from the space being controlled.
BTU & WATT Calculator
Room Dimensions
Room Type
Living Room
Bedroom
Kitchen
Bathroom
Conservatory
Hallway
Glazing Type
Single Glazed
Double Glazed
Triple Glazed
External Walls
0 Wall
1 Wall
2 Walls
3 Walls
4 Walls
Insulation Level
Poor
Average
Good (New Build)
Required Heating
0
Watts
0
BTUs
Do you have a question about this product?
One of our expert advisors will be happy to help you!
