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The Heatmiser Slimline V4 is a wired digital programmable thermostat designed for hydronic underfloor heating systems. It offers precise temperature control and flexible scheduling for homeowners seeking enhanced comfort and energy efficiency, with a key caveat being its requirement for a 35mm electrical backbox and its unsuitability for electric heating systems. Key features include a large, backlit display, multiple programming options, thermostat or timer modes, self-learning optimum start, and floor sensing capabilities.
| Colour | Blue |
|---|---|
| Model Part Number | Slimline V4 |
| Brand | Heatmiser |
The Heatmiser Slimline V4 is designed for hydronic (water-based) underfloor heating systems. It is not suitable for electric underfloor heating or other types of electric heating.
Yes, the Slimline V4 requires a standard 35mm electrical backbox for flush mounting within the wall.
Yes, the thermostat features a 'Holiday Facility' that allows you to set a lower temperature during your absence to save energy, and it can be programmed to return to normal comfort levels before your return.
This feature learns how long your heating system takes to reach your desired temperature. It then automatically adjusts the start time of your heating to ensure your home is warm exactly when you want it to be, rather than just switching on at the set time.
Yes, the Slimline V4 allows you to set up to 4 different comfort levels per day, providing flexibility to match your daily routine.
Floor Sensing Mode uses a dedicated floor probe (sold separately or included with some systems) to monitor and control the temperature of the floor surface directly. This is particularly useful for underfloor heating to maintain a comfortable floor temperature and prevent overheating.
No, the Heatmiser Slimline V4 is a wired thermostat and requires a mains power connection. It is not battery-powered.
Check the mains power supply to the heating system and ensure it is switched on. Verify all wiring connections to the thermostat are secure and correct as per the installation manual.
Confirm the thermostat is set to the correct mode (Thermostat or Timer) and the current time/day is programmed correctly. Check that the set temperature is higher than the ambient room temperature. Ensure the wiring is correct for your specific heating system.
Ensure the thermostat is not located near heat sources (e.g., direct sunlight, radiators, appliances) or drafts. If using a remote air sensor, check its placement and connection. Clean any dust from the thermostat's vents.
Verify that the set temperature is below the ambient room temperature, or check the programming schedule for any unintended high temperature settings. Ensure the thermostat is not stuck in 'Temperature Hold' at a high level.
If using floor sensing, check the floor probe installation and connection. Adjust the floor temperature limit settings if available. If relying on air sensing, consider if a remote air sensor or floor probe would provide more accurate control for your specific needs.
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