Thermostatic or non-thermostatic? This choice affects your towel rail's temperature control, energy efficiency, and running costs. Here's everything you need to know to make the right decision.
Written by the ElegantHeat Team
Heating Specialists with 12+ Years Experience | Based in Coventry, UK
Quick Comparison
| Feature | Thermostatic | Non-Thermostatic |
|---|---|---|
| Temperature control | Adjustable (40-65°C) | Fixed (usually ~60-70°C) |
| Energy efficiency | Better (cycles on/off) | Less efficient (always on) |
| Price | Higher | Lower |
| Safety (touch temp) | Can set lower for children | Gets hot |
| Best for | Daily use, main bathrooms | Occasional use, budget |
What Is a Thermostatic Towel Rail?
A thermostatic towel rail has a built-in thermostat that monitors temperature and cycles the heating element on and off to maintain your chosen temperature.
How It Works
- You set your desired temperature (e.g., 55°C)
- The element heats the towel rail
- When target temperature is reached, element switches off
- When temperature drops below target, element switches back on
- This cycling continues to maintain steady heat
Types of Thermostatic Controls
Dial/Rotary Thermostat
- Simple numbered dial (1-5 or similar)
- Turn to adjust temperature
- No precise temperature reading
- Reliable, affordable
Digital Thermostat
- LCD display showing exact temperature
- Button controls for precise adjustment
- Often includes timer function
- More expensive but more control
Smart/WiFi Thermostat
- App control from your phone
- Advanced scheduling
- Energy monitoring
- Voice control compatibility
What Is a Non-Thermostatic Towel Rail?
A non-thermostatic towel rail has no temperature regulation. When switched on, it heats to its maximum temperature and stays there until switched off.
How It Works
- You switch it on
- Element heats continuously
- Rail reaches maximum temperature (typically 60-70°C)
- Stays at that temperature until you switch off
The Only Control
On/Off switch - that's it. Some may have a simple high/low setting, but no precise temperature control.
Energy Efficiency Comparison
This is where thermostatic rails have a significant advantage:
| Scenario (300W rail, 8 hours) | Thermostatic | Non-Thermostatic |
|---|---|---|
| Element on-time | ~50% (cycles) | 100% (always on) |
| Actual consumption | ~1.2 kWh | 2.4 kWh |
| Daily cost (30p/kWh) | ~36p | 72p |
| Monthly cost | ~£10.80 | £21.60 |
Annual saving with thermostatic: approximately £130
The Payback Calculation
Thermostatic rails typically cost £30-80 more than non-thermostatic equivalents. With £130/year savings, a thermostatic rail pays for itself within the first year.
Safety Comparison
Surface Temperature
| Type | Surface Temp | Touch Safety |
|---|---|---|
| Non-thermostatic | 60-70°C | Can cause discomfort/burns |
| Thermostatic (set high) | 55-65°C | Hot but brief touch OK |
| Thermostatic (set low) | 40-50°C | Comfortable touch |
For Homes with Children
Thermostatic rails allow you to set a lower, safer temperature (around 45-50°C) that still dries towels but won't burn curious little hands.
When to Choose Thermostatic
Choose Thermostatic If:
- Using daily or for extended periods
- Energy efficiency is important
- You have children in the home
- You want precise temperature control
- It's your main bathroom
- You want lower running costs long-term
When to Choose Non-Thermostatic
Choose Non-Thermostatic If:
- Budget is very tight
- Occasional use only (guest bathroom)
- Always used with external timer (timer controls on-time)
- Short heating periods (1-2 hours max)
- No children or vulnerable people in home
Can You Upgrade Later?
Adding Thermostat to Non-Thermostatic Rail
In most cases, no. The heating element in a non-thermostatic rail doesn't have thermostat capability built in. You cannot easily add one.
Alternative: External Control
You can add partial control with:
- Plug-in timer - Controls when it's on, not temperature
- Smart plug - Same as timer, plus app control
- External thermostat socket - Senses room temp, switches power
However, these don't give the same efficiency as a built-in thermostat that monitors the rail's actual temperature.
LOT 20 Compliance Note
UK regulations (LOT 20 Ecodesign) require electric heaters over 1kW to have thermostatic control. Most towel rails are under 1kW, so this doesn't always apply, but:
- Thermostatic models comply regardless of wattage
- Future regulations may extend requirements
- Thermostatic is the more future-proof choice
Read more: What is LOT 20 Compliance?
Ready to Choose Your Towel Rail?
Browse our full range of electric and dual fuel towel rails, all with free UK delivery.
Our Recommendation
For 99% of buyers: Choose thermostatic.
The small extra upfront cost is recovered within months through energy savings. You also get:
- Better comfort (consistent temperature)
- Safer operation (adjustable heat)
- Lower bills (significant savings)
- Longer lifespan (less stress on element)
All our featured electric towel rails at ElegantHeat include thermostatic control as standard.
Last updated: January 2025