Heatmiser Slimline-E V3 – Programmable Thermostat for Electric Underfloor Heating

The Heatmiser Slimline-E V3 is a feature-rich thermostat designed specifically for electric underfloor heating systems. With a high-capacity 16A switching relay (3,680W) and versatile control modes, it offers precise temperature regulation and energy efficiency for modern homes.

Whether you're installing in a bathroom, conservatory, or living area, the Slimline-E V3 adapts to your needs with programmable scheduling, multiple sensing options, and a slim, modern design.

Key Features:

• Designed for Electric Underfloor Heating
  Compatible with systems up to 16A / 3,680W, making it ideal for electric floor heating installations.
• Multiple Sensor Modes for Custom Control
  Choose from:
• • Floor sensor only – Great for floor surface control (e.g., conservatories).
  • Air + Floor sensor – Controls air temperature and prevents floor overheating.
  • Remote Air + Floor – Ideal for bathrooms or where thermostat location needs flexibility.
• Flexible Scheduling Options
• • Non-programmable mode
  • 5/2-day (weekday/weekend)
  • 7-day (individual settings for each day)
  • Same settings for all days

Additional Features:

• Thermostat or Timer mode
• Temperature hold & holiday modes
• Celsius/Fahrenheit selectable
• Frost protection (with adjustable setting)
• Key lock for tamper prevention
• Self-learning Optimum Start (on levels 1 & 3)
• White backlight (auto-off after 30 seconds)

Technical Specifications:

• Supply Voltage: 230V AC
• Load Capacity: 16A / 3,680W
• Floor Sensor: 3m remote probe included
• Mounting: Wall-mounted (standard UK single back box)
• Dimensions: 98mm (H) x 85mm (W) x 13mm (D after installation)
• Weight: 195g
• Sensor Installation Tip: Always install the probe inside a flexible conduit for easy replacement. (Conduit not included)

Compatible Heating Types:

• Electric underfloor heating systems
• Electric radiators or panel heaters (when using built-in air sensor mode)

Click for: Product Installation & Data Sheet

 Frequently Asked Questions

• What is the Heatmiser Slimline-E V3 used for?

It’s a programmable thermostat designed to control electric underfloor heating systems, offering precise temperature and schedule management.

• Is it compatible with all electric underfloor heating systems?

Yes, it works with most electric floor heating systems, provided they do not exceed the thermostat’s load rating (typically 16A / 3600W).

• Does it have a built-in timer or schedule?

Yes, the Slimline-E V3 offers 5/2-day or 7-day programming with 4 heating periods per day, giving you full control over your heating schedule.

• Can it control floor temperature using a sensor?

Yes, it includes a floor sensor probe, allowing you to control temperature based on floor temp, air temp, or a combination of both.

• Does the thermostat have a backlit display?

Yes, it features a large, easy-to-read backlit display, ideal for visibility in all lighting conditions.