KC02 WiFi Smart Heating Thermostat

Overview

The SunAura KC02 is an 86 mm touch-screen WiFi smart thermostat built for residential and light-comfort heating control across three system types: electric underfloor heating, water underfloor heating and gas wall-hung boilers. Its large backlit LED display shows room temperature, the set temperature, the clock and the heating state in one glance, and the full-screen capacitive touch keys keep daily adjustment simple — even for homeowners who never open a phone app.

Where the KC02 earns its place is scheduling. It joins your home WiFi network through the Tuya-compatible smart app, so you can set a 5+2 weekly programme, pre-heat the rooms before you wake up or come home, switch between manual and automatic mode, and lock the panel against children — all remotely, from anywhere. A 3 A dry-contact variant (KC02RH-Wifi) drives boilers and motorised valves, while the 16 A (KC02H) and 20 A (KC02H20A) variants switch resistive electric heating loads directly. Distributors, installers and heating contractors therefore source one platform for almost every heating project.

The KC02 is manufactured by SunAura Thermal, an ISO-managed factory in Qingdao, China, with more than 17 years of OEM/ODM experience supplying heating controls to 50+ countries. Every unit is tested before shipment and carries CE compliance, with a 2-year factory warranty and direct after-sales support.

Key Features

• 86×86 mm touch screen — the standard European wall-box footprint with a bright, backlit LED display and mirror-glass finish when powered off, fitting any living room, bedroom or office interior.
• 5+2 weekly programming — six independent time periods per weekday and two relaxed periods per weekend day, each with its own target temperature, so heating follows your routine instead of running all day.
• Three load variants in one family — KC02H at 16 A and KC02H20A at 20 A for electric heating, KC02RH-Wifi with 3 A dry contact for gas boilers and motorised valves.
• WiFi phone control — full remote operation through the Tuya-compatible app: scheduling, pre-heating, mode switching and monitoring, with support for Tuya-compatible voice assistants.
• Manual / automatic mode — hold a fixed comfortable temperature, or let the unit run the weekly programme automatically.
• Antifreeze (anti-frost) function — protects pipes, loops and holiday homes by keeping the space above freezing while you are away.
• Child lock — a lock icon on the display prevents children or guests from accidentally changing settings.
• Display temperature recalibration — offset the shown reading against a reference thermometer to compensate for wall position and sensor location.
• Power-off memory — user settings are permanently retained when power is cut; no re-programming after an outage.

Display & Icon Guide

The KC02 screen communicates the complete heating state at a glance. The week indicator shows the current day (MON, TUE, WED, THU, FRI, SAT, SUN), the clock runs in 24-hour format, and the WiFi icon confirms connection to the router and cloud. The room temperature reading is displayed prominently, while the target temperature is always marked with the SET label so it is never confused with the measured value. The heating flame icon lights when the output is energised, the house icon marks the comfort / home state, the hand icon indicates manual or boost operation, and the lock icon confirms child lock status.

Physically the KC02 measures 86×86 mm on the front face, flush-fitted into the standard 86 mm wall box. With the display off, the panel reads as a clean mirror-glass plate rather than a dark screen.

Default weekly programme (all periods are pre-set to a comfortable 22 °C and fully adjustable on-device or in the app):

• Monday–Friday: 06:00 / 08:00 / 11:30 / 12:30 / 17:00 / 22:00 — six periods covering wake-up, daytime, lunch, evening and night setback.
• Saturday–Sunday: 08:00 / 23:00 — relaxed two-period programme for weekends and holidays.

Technical Specifications

Applications

The KC02 family covers the three most common residential heating setups from a single platform:

• Electric underfloor heating — heating film, heating mats and heating cables beneath tile, laminate, engineered wood and LVT; direct switching with the 16 A or 20 A variant.
• Water underfloor heating — drives the zone actuator or manifold valve through the 3 A dry-contact output of the KC02RH-Wifi, working alongside your existing boiler.
• Gas wall-hung boilers — the isolated dry-contact output switches the boiler’s call-for-heat terminal safely, keeping thermostat and boiler circuits electrically separated.
• Radiator and smart-valve systems — room-based scheduled comfort for living rooms, bedrooms, bathrooms, offices and small commercial spaces.

Installation

1. Drill and mount the back box — fix the expansion screws (Ø 3–3.5 mm) at a spacing of 60 mm into the standard 86 mm wall box.
2. Wire the terminals — thread the mains and load wires through the rear cover and connect them according to the wiring diagram for your variant (16 A / 20 A load, or 3 A dry contact), leaving about 20 cm of spare wire for neat connection.
3. Fix the back cover — secure the rear shell to the wall box with the screws, tuck the wires neatly into the cavity and check each terminal is tight.
4. Snap the front panel on — align the mirror-glass front and buckle it into place at a 30° angle, then power on and pair the unit with the Tuya-compatible app.

Wiring must be carried out by a qualified electrician, and the connected load must never exceed the rated output of the chosen variant. The external floor sensor cable, when needed for electric floor sensing, must be ordered separately. A printed installation guide ships with every unit, and our engineers are available by WhatsApp for remote commissioning support.

Compatibility with SunAura Heating Systems

The KC02 is the natural control partner for the full SunAura heating range: electric heating film, 160 W/m² heating mats, double-conductor heating cables and renovation mats, as well as water-based underfloor and boiler systems supplied through our project partners. When you order film, mat or cable from SunAura, we can pre-configure the KC02’s temperature range, sensor source (internal air or external floor) and default schedule to match your exact floor build-up, and offer the complete package — heating element, thermostat, insulation and accessories — from a single factory source with one warranty.

Quality, Certification & Support

SunAura Thermal has manufactured heating controls and electric heating products since 2008 from our Qingdao factory, operating with ISO-style quality management and in-line testing on every thermostat batch. The KC02 family is CE compliant, and every unit leaves the factory after a full function test of display, relay output, WiFi pairing and sensor accuracy. We support distributors and OEM customers with private-labelled branding, custom programmes, packaging design and drop-ship logistics to more than 50 countries.

FAQ

1. Which KC02 variant should I choose: 3 A, 16 A or 20 A?

Choose the KC02H20A (20 A) for high-power electric underfloor heating, the KC02H (16 A) for standard electric mats and cables, and the KC02RH-Wifi (3 A dry contact) for gas wall-hung boilers and water-underfloor actuators. The dry-contact version carries no mains load — it only sends a call-for-heat signal, so it pairs safely with your existing boiler or zone valve.

2. How does the 5+2 weekly programming work?

Monday to Friday the KC02 follows six pre-set periods (06:00, 08:00, 11:30, 12:30, 17:00, 22:00) and Saturday–Sunday follows two periods (08:00, 23:00). Every period has its own target temperature, all defaulting to 22 °C. You can edit times and temperatures on the touch screen or remotely in the app.

3. How do I pair the KC02 with the phone app?

Install the Tuya-compatible smart app, create an account and add the device in WiFi pairing mode. Keep the thermostat within router range during pairing, then name each room. Once paired, scheduling, mode changes and monitoring work from anywhere with internet, and the unit works with Tuya-compatible voice assistants.

4. What happens to my settings during a power cut?

Settings are stored permanently in the device memory. When power returns, the KC02 resumes the last weekly programme and setpoint automatically — no re-programming needed.

5. Do I need to buy the external floor sensor separately?

Yes. The external floor sensor cable is an accessory and must be ordered separately when you need true floor-slab temperature control. Without it, the KC02 runs from its built-in internal air sensor, which is fine for most boiler and water-underfloor projects.

6. How do I recalibrate the displayed temperature?

Use the temperature calibration option in the device menu or app to offset the reading against a reference thermometer, typically by ±1 °C, to compensate for wall position or sensor location.

7. How does the child lock work?

Activate the child lock from the touch screen menu or the app; a lock icon appears on the display and further key presses no longer change settings. Deactivate it the same way when you need to adjust the heating.

8. What is the warranty and after-sales support?

Every KC02 includes a 2-year warranty and direct after-sales support from SunAura — spare parts, configuration help and commissioning guidance by WhatsApp, in English, German, French and Chinese.

Sourcing a touch screen thermostat with 5+2 weekly programming for boilers, or a 20A WiFi thermostat for electric underfloor heating projects? The KC02 family answers both from one platform: the KC02RH-Wifi closes a 3 A dry contact for gas wall-hung boilers and motorised valves, while the KC02H (16 A) and KC02H20A (20 A) switch resistive electric heating loads directly. Below you will find factory-direct wholesale terms, OEM options and the long-tail questions installers and distributors ask us most before ordering.

How to Buy the KC02 — Wholesale & Bulk Terms

SunAura Thermal supplies the KC02 series factory-direct from Qingdao to distributors, heating contractors and private-label heating brands in 50+ countries. Wholesale pricing is tiered by variant and quantity, and MOQ depends on whether you order one variant or mix the 3 A, 16 A and 20 A models on one project — send your room-by-room list and we return a same-day quotation. Bulk discounts run from trial orders up to full-container shipments, EXW or FOB terms are quoted on request, and CE compliance documentation accompanies every shipment. Evaluation samples are available before a bulk purchase; the sample and courier charge is confirmed per enquiry, and spare faceplates in black or white can be added to the sample box so you can check the mirror-glass finish in your own interior.

Request a quote by contacting our sales team or messaging us on WhatsApp — tell us whether each room runs electric floor heating, water underfloor or a gas boiler so we recommend the correct variant per zone. Explore the whole line-up in the WiFi thermostat category, and compare interfaces such as our 433 MHz wireless boiler thermostat for retrofit zones where running a neutral wire to the wall box is impossible.

Ordering, Shipping & Customization

Once your order is confirmed, we can pre-configure each KC02 unit so it arrives commission-ready: the default 5+2 schedule (six weekday periods and two relaxed weekend periods, pre-set to 22 °C) can be shifted to your local wake-up and bedtime routine, the internal-air versus external-floor sensor source can be fixed per room, and the child-lock and antifreeze thresholds can be set before packing. Distributors also receive private-labelled cartons, your artwork on the packaging, and drop-ship logistics direct to your installers. Remember that the external floor sensor cable is an accessory ordered separately whenever true floor-slab temperature control is required — add it to the same PO so the controller, sensor and wiring diagram travel together.

More Frequently Asked Questions

9. Can I mix KC02 variants across the rooms of one project?

Yes — that is exactly how the family is designed. Electric floor-heating rooms take the KC02H (16 A) or KC02H20A (20 A), while boiler rooms and water-underfloor zones take the KC02RH-Wifi (3 A dry contact). Because all three variants share the same 86×86 mm mirror-glass face and the same Tuya-compatible app, your installers only need to learn one product and your end customers see a consistent wall plate throughout the building. Send us the room list and we will price each variant.

10. Does the KC02 work as a replacement for my old gas wall-hung boiler room thermostat?

Yes. The KC02RH-Wifi is designed exactly for this: its 3 A volt-free dry contact replaces a conventional room thermostat’s call-for-heat wiring, keeping the thermostat and boiler circuits electrically separated. Most wall-hung boilers accept a volt-free contact, and the unit still adds weekly scheduling, app control and antifreeze protection to the old system — confirm your boiler’s switching requirement at order time and we will advise on the terminal connection.

11. How do distributors get CE documentation and private-labelling?

CE compliance documents, test reports and project quotations are prepared on request before order confirmation, and every unit passes a function test of display, relay output, WiFi pairing and sensor accuracy before packing. Private-labelling — logo, packaging artwork and pre-loaded schedules — is arranged through our OEM team. Start by sending our sales team a project enquiry, check delivery and commissioning details on our main FAQ page, and see real deployments for electric, water and boiler systems in our applications gallery. If some zones suit a different interface, the LED side-button SDM5 thermostat is a natural companion on the same project.

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