Thermostats & Controllers for Underfloor Heating in Wollongong & the Illawarra
The heating cable or mat is only half the system — the thermostat is the brain that decides when the floor warms up, how hot it gets, and how much you spend doing it. Get the controller right and an Illawarra bathroom is warm underfoot the moment you step out of the shower on a cold July morning, then quietly off again by mid-morning; get it wrong and you’re either cold or paying to heat an empty room. Every system in our Underfloor Heating range — whether it’s an in-screed cable or an under-tile mat — needs one of these thermostats to run it. Below we cover the programmable and WiFi touch controllers we stock from Thermogroup and Radiant, so you can match the brain to the way you actually use the room.
Programmable vs WiFi — and Sizing to Your Heating Load
Every controller here is programmable: you set a 7-day (or 5+2) schedule so the floor is warm before you wake and off when the house is empty, which is where the real savings live — heating a bathroom on a timer costs a fraction of leaving it on. A WiFi thermostat adds app control on top, so you can flick the floor on from your phone before you get home, or manage a holiday house or rental remotely. Both types read a floor sensor (and often an air sensor) to hold a set temperature rather than blindly running the element. Sizing matters too: check the heating circuit’s amp draw against the thermostat’s max load — the Thermogroup units here carry a 16 A rating that comfortably covers a typical bathroom mat or cable, while a dual controller can split the floor and a heated towel rail across two zones. The choice pairs with the system you’re laying: warming a slab with in-screed heating or a quicker-responding under-tile heating mat. For the bigger comfort-and-running-cost picture, see our guides to sustainable, eco-friendly bathroom choices and sustainable water and energy solutions for Illawarra homes.
Thermogroup Thermotouch 5235W WiFi Programmable Thermostat
The Thermotouch 5235W is Thermogroup’s flagship WiFi controller — a colour touchscreen thermostat you run either from the wall or from the smartphone app, with multi-zone scheduling that keeps the floor warm exactly when your Wollongong household needs it and off when it doesn’t. It operates on IEEE 802.11 b/g/n 2.4 GHz WiFi, so remote control works from anywhere with a signal. The 176×220 px TFT resistive touch display can be fitted in either landscape or portrait orientation to suit the wall, and an optional black facia kit (Stock No. 5238) swaps the standard white finish. It handles a 16 A max load, carries an IP21 rating and reads an NTC 12 kΩ floor sensor across a 5–40°C range in 0.5°C steps, all backed by a 3-year warranty. If you want set-and-forget comfort with phone control, this is the pick.
Thermogroup Thermotouch 7.6iG Glass Programmable Thermostat
For a slicker wall finish without the WiFi, the Thermotouch 7.6iG puts a glass fascia over a straightforward programmable touchscreen. It offers full 7-day programming and a floor sensor input, so you get scheduled, sensor-controlled comfort at the wall — ideal for a main bathroom or ensuite where you don’t need app control but do want the room warm on a timetable. The glass front comes in Ice White (Stock No. 5220A) or Piano Black (Stock No. 5226A) to match your tapware and tiles. It carries the same 16 A max load as its WiFi sibling, an IP30 rating and a wide 5–80°C range reading an NTC 10 kΩ sensor, with optional landscape mounting plates available. A clean, tactile controller backed by a 3-year warranty.
Radiant Universal Touch Screen WiFi Thermostat — White
Radiant’s Universal WiFi thermostat (SKU UTSW-TH-WIFI) is the brand’s premium controller for its electric underfloor heating, giving clear control from a large colour touch screen or remotely through the mobile app. The single unit mounts vertically or horizontally without changing hardware, so it fits whatever wall space your Illawarra bathroom leaves. It runs 5+2 or 7-day scheduling and takes a selectable floor or air sensor input, holding comfort while trimming energy use. Remote app access makes it a genuinely useful pick for holiday homes and rentals across the South Coast where you can’t always be there to switch the floor on. It runs on standard 240V, is approved to SAA Standards for Australian compliance, and comes with a 2-year warranty. A non-WiFi version (UTSW-TH) and a black finish (UTSB-TH-WIFI) are also available.
Radiant Premium Dual Thermostat / Towel Rail Timer — White, Vertical
If your bathroom has both a heated floor and a heated towel rail, this Radiant dual controller (SKU GTSW-DUAL-V) runs both from one wall plate instead of two. Its two independent zones let you schedule the underfloor heating and the towel rail on separate timetables — floor warm for the morning shower, rail running longer to dry towels — from a single premium glass touchscreen in a vertical white finish. It’s the same functional platform as the standard TS8100 unit, upgraded with the glass screen for a more premium look. Runs on 240V and is approved to SAA Standards (Certificate No. SAA-231578-EA, AS/NZS 60669.2.1:2020 / 60669.1:2020), with a 2-year warranty. Note the towel-rail zone is warrantied for Radiant 12/24V rails with a load below 8 A and no current inrush — check compatibility before pairing other brands. Also available in horizontal orientation and silver/black finishes.
Match the Controller to Your System
The right thermostat comes down to how you live: a WiFi unit like the Thermotouch 5235W or Radiant Universal if you want phone control and remote access for a holiday home; the glass Thermotouch 7.6iG for clean, scheduled comfort at the wall; or the Radiant dual controller if you’re running a heated towel rail alongside the floor. Whichever you choose, it needs a heating system beneath it — plan the element first with our in-screed heating cables for slabs and new builds, or under-tile heating mats for faster-warming renovations. Serving Wollongong, Unanderra and the wider Illawarra and South Coast, our team can size the controller to your heating load and show you the range in person — get in touch and we’ll match the brain to your bathroom.
