Combines smart home control, sleek design, and advanced energy tracking. With a 3.5" touchscreen, intuitive scheduling, and built-in GFCI safety, it’s the perfect solution for managing electric underfloor heating with precision and ease.
Brand: OJ Electronics
Availability: Sold In Store - Ships From Store (35 available in store). (More Info)
Shipping: Free to Continental US (More Info)
The OJ Microline UDG4 Programmable WiFi Thermostat is an advanced, touch-controlled thermostat designed for electric underfloor heating systems. Featuring a sleek color display, intuitive navigation, and smart scheduling, it offers precision temperature control and effortless operation for homeowners and professionals alike.
Built with WiFi connectivity, Class A GFCI protection, and a 3.5" color touchscreen, the UDG4 provides reliable comfort and energy efficiency for tile, stone, laminate, concrete, and wood floors. Its power logging and programmable scheduling help you maintain optimal warmth while tracking energy use in real time.






















| Model | UDG4-4999 | Voltage Supply | 120–240 VAC, 50/60 Hz |
|---|---|---|---|
| Load Capacity | 15A maximum (resistive load) | Power Output | 1,800 W @ 120 VAC / 3,120 W @ 208 VAC / 3,600 W @ 240 VAC |
| GFCI Protection | Class A (5 mA trip level) | Temperature Range | +41°F to +104°F (+5°C to +40°C) |
| Floor Limit Range | +41°F to +104°F (+5°C to +40°C) | Floor Protection (Laminate/Wood) | 82°F (27.5°C) |
| Floor Protection (Tile) | 88°F (31.0°C) | Ambient Temperature Range | +32°F to +104°F (0°C to +40°C) |
| Control Accuracy (Differential) | ±0.7°F (±0.4°C) | Regulation Principle | PWM / PI |
| Enclosure Rating | IP20 | Sensor Type | NTC (10 KΩ), 15 ft (4.5 m) |
| Dimensions (L x W x H) | 3.19" x 1.97" x 5.08" | Display | 3.5" color touchscreen (65K color, resistive touch) |
UDG4-4999 Programmable WiFi Thermostat - Product Data Sheet
UDG4-4999 Programmable WiFi Thermostat - User Manual
UDG4-4999 Programmable WiFi Thermostat - Product Brochure
UDG4-4999 Programmable WiFi Thermostat - Quick Guide
OJ Microline Electric Floor Heating Product Catalogue
When is My Thermostat Produced
Exchange of Front Plate on UWG4 and UDG4
Troubleshooting Fault Codes Guide
| SKU | MH UDG4-4999 |
|---|---|
| UPC | 796299031565 |
| Non-Returnable | No |
| Manufacturer | OJ Electronics |
| Manufacturer Part Number | UDG4-4999 |
| Voltage | 120/240 |
| Weight (lbs.) | 0.75 |
| Dimensions (L x W x H) | 3.19" x 1.97" x 5.08" |