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Heatmiser Slimline-W Programmable Thermostat V4

From £42.99
Now £42.99
in stock, ready to be shipped
Heatmiser Slimline-W Programmable Thermostat V4
From £42.99
Now £42.99
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For delivery on Tuesday

When ordered before 4pm (On weekdays)

Take your heating control to the next level with the Heatmiser Slimline-W Programmable Thermostat. This 230V thermostat combines the functionality of a room stat and a programmer, providing convenient and efficient temperature control for your home.

Key Features:

  • Programmable Functionality: Set up to 4 different temperatures at different times of the day for optimal comfort and energy savings.
  • Self Learning Preheat: The thermostat calculates the heat-up time needed to reach your desired temperature, optimizing energy usage.
  • Temperature Hold Facility: Set a specific temperature for a desired duration, maintaining energy efficiency and comfort.
  • Key Locking: Prevent unauthorized changes with key locking functionality, ensuring the security of your programmed settings.
  • Flexible Programming Options: Choose from non-programmable, 5/2 day, and 7-day programming modes to suit your lifestyle.
  • Blue Backlight: The blue backlight provides clear visibility and conserves energy when not in use.
  • Holiday Feature: Set a different temperature while you're away to save energy and ensure comfort upon your return.
  • °C / °F Selectable: Switch between Celsius and Fahrenheit temperature units.
  • Frost Protection: Prevent freezing and protect your heating system with adjustable frost protection.

Upgrade your heating control with the Heatmiser Slimline-W Programmable Thermostat and enjoy personalized comfort and energy efficiency tailored to your lifestyle.

Max Output Volt Free 3A Max
Supply 230V
Dimensions (L,H,D) 99x86x15mm
Temperature Range 5-35 °C
No. Heating Levels 4
Optional Probe (not included) Floor or Thimble Sensor
Probe Rating 10Kohm
IP Rating IP20
  1. Separate the front half of the thermostat from the back plate using a small flat head terminal driver.
  2. Terminate the thermostat according to the wiring diagram and securely screw the back plate into the back box.
  3. Clip the front of the thermostat back onto the back plate.

Important: Install the thermostat away from direct heat sources to maintain functionality. Avoid pushing hard on the LCD screen to prevent damage.

This Slimline Series thermostat is designed for flush mounting and requires a back box with a minimum depth of 35mm.

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Our product experts are here to assist with any enquiry you might have.

Our customer support is available Monday to Friday 7am-6pm.

Call us on 0800 141 2643

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Free delivery on all orders*

At Underfloor Heating Direct, 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 orders over £100 or next working day delivery for a fixed price of £5.99.

  • 2-3 working days delivery, order over £100 - FREE (£5.99 if under £100)
  • Next working day - £9.99 (Order before 4pm Monday - Friday)
  • Next working day before 12 noon - £19.99 (Order before 4pm Monday - Friday)
  • Saturday delivery - £29.99 (Order before 4pm Friday)

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30 days returns policy

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


At Underfloor Heating Direct, 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.


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.


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.

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Long-lasting warranty

At Underfloor Heating Direct, 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 10 year warranty for our electric underfloor heating kits.

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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