ER WIFI Chrome Thermostatic Heating Element
Product Overview & Key Specs
The ER WiFi Chrome Thermostatic Element is a smart heating element for towel rails and electric radiators. Control it from the Tuya / Smart Life app, set the temperature from 30°C to 70°C in 1°C steps, and choose from five heating modes including a weekly program. Available in 150W, 300W, 600W and 900W. Please note it has no room thermostat: its sensor measures the internal temperature of the radiator only.
Five Heating Modes
| Drying mode | Fixed 4 hours, then switches off. Ideal for drying towels. |
| Thermostatic mode | Holds the radiator at your set temperature, 30–70°C (default 50°C), for 4 hours. |
| Heating mode | Fixed 70°C for 4 hours, for the fastest warm-up. |
| Timing mode | Heats at your set temperature for 1–8 hours (default 4). Available when WiFi is off. |
| Weekly program | Choose the hours it heats and the hours it stays off, in the app. Available when WiFi is on. |
Technical Specifications
| Power options | 150W | 300W | 600W | 900W |
| Finish | Chrome |
| Temperature sensing | Internal radiator temperature only (no room thermostat) |
| Temperature range | 30°C to 70°C, 1°C steps |
| Temperature compensation | −5 to +5°C (default −2°C) |
| Control | On-unit buttons and Tuya / Smart Life app (WiFi + Bluetooth setup) |
| Voice control | Amazon Alexa and Google Assistant, via the Smart Life app |
| Connection | 1/2" thread, 22mm spanner |
| Voltage | 220–240V AC, 50Hz |
| IP rating | IPX4 |
| Appliance class | Class I |
| Cable length | 1.1m |
| Display / controller | 65mm mirrored display · 95mm controller height · 40mm depth |
| Installation | Qualified electrician, hardwired to a fused spur |
| Warranty | 1 year |
How the Temperature Sensor Works
This element does not have a room thermostat. The built-in sensor reads the temperature inside the radiator, so the temperature you set is the temperature of the radiator itself, not of the room. It cannot switch on or off in response to room temperature, so pick a mode, temperature and heating time to suit your space. If the reading differs from the true radiator temperature, an installer can fine-tune it with the temperature compensation setting (F1, −5 to +5°C).
Frequently Asked Questions
Does the ER WiFi element have a room thermostat?
How do I connect it to the app?
What is the difference between the modes?
Can I schedule it to heat at set times?
Does it need a qualified electrician?
Can I run it when the radiator is empty?
Which wattage should I choose?
What does the Er error code mean?
Does it work with Alexa and Google Assistant?
Fast UK Delivery
Order before noon for next working day delivery anywhere in the UK mainland.
Expert Advice
Real heating specialists — not a call centre. WhatsApp us for instant help.
Trusted Since 2012
UK-based in Coventry with 14 years serving homeowners, plumbers & designers.
