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Heatmiser Slimline-E Programmable Thermostat V3

From £69.99
Now £69.99
in stock, ready to be shipped
Heatmiser Slimline-E Programmable Thermostat V3
From £69.99
Now £69.99
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For delivery on Wednesday

When ordered before 4pm (On weekdays)

The Heatmiser Slimline-E is a programmable thermostat specifically designed for electric underfloor heating systems. It is compatible with all electric floor systems with a total load of less than 16A, ensuring efficient control of your underfloor heating.


  • Self Learning Preheat: The Slimline-E thermostat features optimum start, a smart function that calculates the required heat-up time for optimal comfort.
  • Temperature Hold Facility: Enjoy the convenience of setting a desired temperature for a specific duration with the temperature hold feature. Once the set time has expired, the thermostat will return to its normal program.
  • Key Locking: The thermostat comes with key locking functionality, reducing the risk of tampering with the heating system and maintaining desired settings.
  • Flexible Programming: Choose from non-programmable, 5/2 day, or 7-day programming options to suit your specific needs and preferences.
  • Blue Backlight: The Slimline-E thermostat incorporates a blue backlight that automatically turns off when not in use, providing clear visibility without unnecessary energy consumption.
  • Holiday Feature: Enjoy the convenience of a holiday feature that allows you to set a specific temperature while you are away, ensuring energy efficiency and preventing unnecessary heating.
  • °C / °F Selectable: Easily switch between Celsius and Fahrenheit temperature units to match your preferred measurement system.
  • Frost Protection: The thermostat includes an adjustable temperature setting for frost protection, preventing freezing and maintaining the integrity of your underfloor heating system.
  • 16A Switch Rating: With a switch rating of 16A (3,680 watts), the Slimline-E thermostat can handle the power requirements of your electric underfloor heating system.
  • Floor Sensor Included: The thermostat comes with a floor sensor, ensuring accurate temperature measurement and control.
  • Floor, Air or Floor and Air Sensors: Choose between floor, air, or a combination of floor and air sensors to monitor and control the temperature according to your preference.
Max Current 16A
Supply 230v
Dimensions (L,H,D) 98x85x13mm
Temperature Range 05-35C
No. Heating Levels 4
Weight 195g
Probe Option Floor or Remote Air Probe
Probe Rating 10Kohm
IP Rating IP20
  1. Carefully separate the front half of the thermostat from the back plate by placing a small flat head terminal driver into the slots on the bottom face of the thermostat.
  2. Place the thermostat front somewhere safe.Terminate the thermostat as shown in the wiring diagram above.
  3. Screw the thermostat back plate securely into the back box.
  4. Clip the front of the thermostat back onto the thermostat back plate.

Important Do not install near to a direct heat source as this will affect functionality.

Important Do not push hard on the LCD screen as this may cause irreparable damage.

This Slimline Series thermostat is designed to be flush mounted and requires a back box of 35mm (minimum depth) to be sunk into the wall prior to installation.

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    Free delivery on all orders

    At The Underfloor Heating Store, we strive to make every step of your order as easy and convenient as possible, from finding the right underfloor heating setup to best suit you to taking delivery of your system the very next day.

    We're proud to offer a range of delivery options to suit you, including free delivery on all of our orders or next working day delivery for a fixed price of £4.99

    • 2-3 working days delivery - FREE (Order before 4pm Monday - Friday)
    • Next working day - £4.99 (Order before 4pm Monday - Friday, applies to orders over £19.99)
    • Next working day before 10.30am - £14.99 (Order before 4pm Monday - Friday)
    • Saturday delivery - £29.99 (Order before 4pm Monday - Friday)
    • Free collection from our Basildon warehouse in Essex

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    30 days returns policy

    At The Underfloor Heating Store, our customers have 30 days to upgrade, replace or refund their orders.


    At The Underfloor Heating Store, we want to ensure you are happy with every purchase you make. If you have any issues with your chosen product, whether damaged, faulty or simply an unwanted item, you can simply return what you bought for a refund. Learn more.


    We take great care in the delivery of all of our products, however, in the event of your delivery arriving damaged or if you notice a manufacturing fault of any kind within 48 hours of delivery, you're within your rights to a replacement. Learn more.


    Within 14 days of purchasing from us, you are eligible to upgrade if you deem you want something a little better. Simply send it back to us brand new and we'll happily assist you with an upgrade to your order. Learn more.

    Lifetime warranty

    At The Underfloor Heating Store, we are committed to providing our customers with high-quality products and outstanding customer service. That's why we offer a comprehensive warranty on all of our underfloor heating products, with a lifetime warranty for our ProWarm range of products.

    Our warranties are designed to give you peace of mind and ensure that your underfloor heating system operates reliably for years to come.

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    We'll beat any price

    At The Underfloor Heating Store, our main priority is customer satisfaction. To cement our commitment to this, we are proud to offer our Underfloor Heating Price Match Promise. If you find a lower price on an identical product anywhere else, we will match it – guaranteed!

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