OJ Microline UDG-4999 Programmable Floor Heating Thermostat
The OJ Microline UDG-4999 is a 7-day programmable floor heating thermostat for electric radiant floor systems — combining a reliable 4-event daily schedule with built-in Class A GFCI protection, dual sensing, and dual voltage capability in a single C-UL-us Listed unit. It is compatible with all LuxHeat floor heating cables and mats and works with most 120V or 240V electric radiant systems under tile, stone, laminate, concrete, wood, and carpet.
The microline thermostat's factory-set schedule covers morning, day, evening, and night and is easily customized to match your routine — delivering consistent floor temperature comfort without manual adjustments throughout the day. The built-in GFCI meets code requirements for bathroom and wet room installations without the need for a separate outlet, and includes a self-testing mode for ongoing compliance verification.
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OJ Microline UDG-4999 7-day/4-event programmable schedule — customize floor temperature for each part of the day across a full weekly calendar; factory defaults work out of the box with minimal setup
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Class A GFCI built-in with self-testing mode — meets NEC requirements for bathroom and wet room installations; no separate GFCI outlet or breaker required
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Dual voltage — 120V, 208V, 240V — handles any standard North American radiant heating circuit up to 15A (1800W@120V / 3120W@208V / 3600W@240V)
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Dual sensing — air + floor — simultaneously monitors ambient room temperature and floor surface temperature to prevent overheating sensitive floor materials
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Includes NTC 10K Ohm floor sensor — floor temperature sensor arrives in the box; temperature limiting feature protects hardwood and engineered wood floors; floor limit range +41–104°F
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Child Lock and manual override — restrict access to prevent unintended schedule changes; use manual override to adjust temperature temporarily without modifying the program
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Energy consumption readout — tracks actual running cost over time, giving visibility into operating expenses and helping identify opportunities to reduce energy use
The OJ Microline UDG-4999 floor heating thermostat is C-UL-us Listed and certified for wet room installations. Backed by OJ Electronics' 3-year factory warranty. Compatible with LuxHeat systems and most other 120/240V electric radiant heating cables and mats. Free shipping within the contiguous US.
Frequently Asked Questions
What is the difference between the OJ Microline UDG-4999 and the UDG4-4999?
The UDG-4999 uses a traditional push-button interface and standard digital display, while the UDG4-4999 features a 3.5" color touchscreen for more user friendly, interactive navigation and control. Both models include built-in GFCI, dual voltage (120/240V), dual sensing, a 7-day programmable schedule, and an included floor sensor. The UDG4-4999 is the premium model; the UDG-4999 is the standard programmable option at a lower price point with all the same core functionality.
Does the OJ Microline UDG-4999 require a separate GFCI outlet?
No. The UDG-4999 has a Class A GFCI built directly into the thermostat with a self-testing mode. No additional GFCI outlet, breaker, or protection device is needed. It is C-UL-us Listed and certified for bathroom and wet room installation straight out of the box.
