nHance Programmable Thermostat UDG-4999

Part Number: UDG-4999
The nHance is an “all-in-one” programmable thermostat for electric underfloor heating control where optimal comfort temperature and minimum energy consumption is required.
This support page provides publications, manuals, specifications, videos, support articles, and common support questions

Common Support Questions (10)

Publications and Manuals (13)

Specifications (22)

Videos (4)

Articles (5)

Related Items (2)

Similar Items (1)

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Common Support Questions

Breaker and wire sizes are selected based on the total amperage of the heating system connected to a single thermostat. This information is on the heating product's installation plan, electrical plan, or UL label. Based on guidelines from the National Electrical Code: loads up to 16 Amps may utilize 12 gauge wire with a 20-Amp breaker, and loads up to 12 Amps - 14 gauge wire with a 15-Amp breaker. Local code and/or other factors may change these guidelines.

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Pressing and holding (2-3 sec) physical power/reset button will turn the unit completely OFF. Same process turns the unit back on.

(nHance and nJoin units will have the button on the front faceplate, nSpire Touch WiFi, nSpire Touch and nTrust will have the button on the right side of the faceplate.)

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Child lock is activated


  • From the home screen
  • Press "OK" button twice
  • Press button UP and DOWN simultaneously for 3 sec.
  • Unlock Child Lock

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Floor sensor is not connected to terminals C&D, defective or damaged


Error code "E2" means defective, damaged or not connected floor sensor. Check connections or replace sensor if necessary.

Sensor resistance should be in 8-16k range and can be tested with a digital multimeter in 20k scale.

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Your heat mat or installation between thermostat and heat mat has a fault current to ground


The thermostat has cut off the power for your safety. Please contact your local electrician.

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The connection is incorrect


Check the connections between the two units. If the USG is connected incorrectly to the thermostat, the USG won't switch off.

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Yes, the floor sensor wire can be extended up to 300 feet with 18 AWG wire.

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Yes the adaptive function is reset during a factory reset.

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All thermostats are mandated at 42" height for handicap accessibility, most private residences are mounted at 52-60".

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The ground wire in the floor mat must be connected directly to the ground wire of the supply or to the house ground wire.

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Publications and Manuals


Warranty / Certifications

Approvals cULus listed
Ingress Protection (IPxx) Rating IP21
Warranty Limited 3-year warranty and lifetime technical support


Circuits Required 1
Connection 4 wires, double pole
Connection Method Hardwired
Ground Fault Protection GFCI, Class A, 5 mA
Maximum Current 15A
Maximum Power 1800 W @ 120 V, 3120 W @ 208 V, 3600 W @ 240 V
Supply 120 VAC, 208 VAC, 240 VAC (50/60Hz)


Country of Origin (COO) Denmark

Product Dimensions

Depth 2in
Installed Depth 0.75in
Length 4.688″
Width 2.875″


Display Backlit Display
Display Size 3.5″


Floor Sensor Compatibility 10k ohms and 12k ohms
Includes Floor Sensor Yes (1)
Programmable Yes, 7-day


SKU UDG-4999
UPC (GTIN-12) 881308051211



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