Overview
The SunAura WiFi Smart LCD Piano-Key Thermostat is a wall-mounted smart heating controller built for three of the most common hydronic and electric heating installations: water underfloor heating, electric underfloor heating and gas wall-hung boilers. On the front, a slim champagne or white 86×86 mm faceplate carries a narrow black LCD strip across the top and three piano-style physical keys beneath it — M for mode, ↑ for up and ↓ for down. The result is a thermostat that looks at home in a modern living room and is still quick to operate by touch, even when nobody wants to pull out a phone.
Smart control is where this unit adds real value. It connects to your home WiFi (2.4 GHz) and the companion smartphone app, so you can check the room temperature, adjust the set temperature, switch between Auto and Manual mode and build a weekly heating programme from anywhere. The app also offers antifreeze protection, a child lock and full program scheduling, and the thermostat works with the Tuya-compatible app ecosystem and supported voice assistants for hands-free temperature control. Whether you are a homeowner upgrading one room, a hotel fitting out dozens of rooms, or a distributor sourcing a private-label controller, the piano-key thermostat combines straightforward local operation with modern remote control in one compact wall unit.
The thermostat 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 customers in 50+ countries. Every unit is tested on the production line before shipment and carries a 2-year warranty, with direct after-sales support by WhatsApp.
Key Features
- Three piano-key physical controls — tactile M (mode), up and down keys that respond with a firm press, so changing the temperature is easy even for children, elderly users or guests who never open the app.
- One thermostat, three heating types — choose the 16 A direct-switching version for electric underfloor heating, or the 3 A volt-free dry-contact version for water underfloor heating and gas wall-hung boilers.
- WiFi app remote control — monitor room temperature and adjust the setpoint from the office, the car or the sofa, using the iOS / Android app on your phone.
- Auto / Manual programme modes — let the weekly schedule run automatically through the day, or hold a fixed comfort temperature for a special evening.
- Antifreeze protection — keeps the space above freezing while you are away, protecting pipes, manifolds, pumps and the boiler during winter holidays.
- Child lock — lock the physical keys and the app settings so temperatures and programmes are not changed by accident.
- External floor sensor ready — connect an NTC 10 kΩ floor sensor (β = 3950) to terminals 6 and 7 to control floor temperature directly and protect sensitive floor finishes.
- Voice-assistant ready — works with the Tuya-compatible app ecosystem and supported voice assistants, so you can raise or lower the heating by voice when your hands are full.
- Compact 86×86 mm faceplate — standard European wall-box size, 14 mm flush / 26 mm total depth, in champagne or white to match any interior décor.
Display & Icon Guide
The black LCD strip across the top of the faceplate communicates the full heating state at a glance. On the left, the HOME icon sits beside the ROOM reading — for example, 21.1 °C, the measured room temperature. On the right, the SET reading — for example, 23.0 °C — marks the target temperature, so the measured and set values are never confused. Along the strip you will also find the time display in 24-hour format (for example, 15:21), the day-of-week indicator, the WiFi icon showing app connection status, and the heating flame icon that lights whenever the output is switched on. A child-lock indicator confirms the keys are locked, and the mode indicator shows whether the thermostat is following the weekly programme or holding a manual setpoint.
Operating the thermostat is deliberately simple: press M to cycle between modes (Manual, Auto programme, antifreeze and off), press ↑ to raise the set temperature and ↓ to lower it. In the app, the same state is mirrored in English: current room temperature, target setpoint, an Auto / Manual toggle, the antifreeze switch, the child-lock switch and the weekly program editor, all on one screen. This split design — physical keys for everyday use, app for scheduling — means the building runs efficiently while occupants still feel in control on the wall.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product type | WiFi smart LCD heating thermostat with piano-key physical controls |
| Faceplate | 86 × 86 mm square, piano-key operation, champagne or white finish |
| Dimensions / depth | 86 × 86 mm; 14 mm flush mounting depth / 26 mm total depth (standard 86-box) |
| Display | Top black LCD strip — time (24 h), day of week, room temperature, set temperature (SET), heating flame icon, WiFi icon, HOME icon, child-lock indicator |
| Controls | 3 piano-style physical keys: M (mode), ↑ (up), ↓ (down) |
| Heating compatibility | Water underfloor heating, electric underfloor heating, gas wall-hung boilers |
| Output — electric version | 16 A direct switching; mains L/N on terminals 1/2, heating load L1/N1 on terminals 4/3 |
| Output — boiler / water version | 3 A volt-free dry contact (NO / NC) across N / L / NO / NC terminals |
| Sensor | Internal air sensor plus optional external NTC floor sensor: 10 kΩ at 25 °C, β = 3950, terminals 6 / 7 |
| Wireless | WiFi 2.4 GHz, smartphone app (iOS / Android), Tuya-compatible app and voice assistants |
| App features | Auto / Manual mode, antifreeze, child lock, weekly program scheduling, remote setpoint adjustment |
| Electrical & environmental parameters | Full datasheet provided on request — supply voltage class, settable temperature range, control accuracy, protection rating and housing material confirmed per order |
| Warranty | 2-year standard warranty with SunAura after-sales support |
Applications
Because the same faceplate covers electric underfloor heating, water underfloor heating and boiler switching, this thermostat fits a wide range of residential and light-commercial projects:
- Private homes and apartments — living rooms, bedrooms and nurseries with electric film, heating cable or water underfloor heating; the champagne or white faceplate suits modern interiors.
- Offices and meeting rooms — simple local keys for staff, plus app scheduling for facilities managers who want the heating to follow the working week.
- Hotels and serviced apartments — child lock and antifreeze protect unoccupied rooms, while the dry-contact version switches the room’s wall-hung boiler or water-zone valve safely.
- Commercial markets, shops and showrooms — robust push-button operation in spaces where a touchscreen might be accidentally triggered or damaged by passing customers.
- Renovation and retrofit projects — the standard 86 mm wall-box footprint means it drops into most existing thermostat back boxes without replastering or redecorating.
Installation
Installation follows the standard 86 mm flush-mount back-box procedure and should be carried out by a qualified electrician or heating engineer:
- Isolate the supply and remove the old thermostat from the wall box, labelling the existing wires before disconnecting them.
- Wire the back plate according to your heating type. For electric underfloor heating (16 A version): connect mains L and N to terminals 1 and 2, and the heating load conductors L1 and N1 to terminals 4 and 3; if used, connect the external NTC floor sensor to terminals 6 and 7. For water underfloor heating or a gas wall-hung boiler (3 A version): use the volt-free dry-contact terminals NO / NC / N / L to give the zone valve or boiler a call-for-heat signal — never put a mains load directly across the dry contact.
- Fit the faceplate to the wall box, snap the cover into place, restore power and check that the black LCD strip lights up with the room temperature.
- Pair with the app over the 2.4 GHz WiFi band, confirm the WiFi icon appears on the display, then set the day, time and weekly programme either on the piano keys or in the app.
The connected load must never exceed the rated output for the chosen version. A printed wiring diagram and installation guide ship with every order, and SunAura engineers are available by WhatsApp for remote commissioning support in English, German, French and Chinese.
Compatibility with SunAura Heating Systems
The piano-key thermostat is the natural control partner for the full SunAura heating range: electric underfloor heating film and mats, heating cables, water underfloor heating manifolds and gas wall-hung boiler systems. When you order heating film, cable, mat or a boiler-controlled zone from SunAura, we can pre-select the matching thermostat version — 16 A direct switching for electric loads, or 3 A dry contact for water and boiler loads — and pre-configure the floor sensor parameters to match your floor build-up. Buying the heater and the thermostat from the same factory means one warranty, one after-sales contact and one WhatsApp number for commissioning support, whether you fit a single apartment or a multi-room hotel project. OEM customers can also ask for a custom faceplate colour, private-labelling and a pre-loaded weekly programme to match their own installation manuals.
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 piano-key thermostat is available with private-labelling, custom faceplate colours and custom weekly programmes for OEM and distribution customers. Full compliance documentation and the complete technical datasheet — supply voltage class, settable temperature range, control accuracy, protection rating and housing material — are provided on request before order confirmation. We ship worldwide to more than 50 countries and support every unit with a 2-year warranty and direct after-sales by WhatsApp, so distributors and installers always have an engineer to turn to.
FAQ
1. How do the three piano keys work?
There are three physical keys below the LCD strip: M selects the operating mode (cycling between Manual, the Auto weekly programme, antifreeze and off), ↑ raises the set temperature and ↓ lowers it. The current state is shown on the top LCD strip — room temperature on the left marked ROOM, set temperature on the right marked SET, with the flame, WiFi and child-lock icons lit as needed.
2. Should I choose the 16 A version or the 3 A dry-contact version?
Choose the 16 A direct-switching version for electric underfloor heating — heating film, heating cables or electric mats — where the thermostat switches the heating load itself through terminals 1/2 (mains) and 4/3 (load). Choose the 3 A dry-contact version for water underfloor heating and gas wall-hung boilers, where the thermostat only gives a volt-free NO/NC call-for-heat signal and the boiler or zone valve does the switching. If you are unsure, send us your load details and we will confirm the correct version before dispatch.
3. How do I pair the thermostat with the phone app?
Install the Tuya-compatible smart home app on your iOS or Android phone, connect the phone to your 2.4 GHz WiFi network, then follow the app’s “add device” wizard to put the thermostat into pairing mode. Once paired, the WiFi icon on the LCD strip stays lit and you can adjust the temperature, switch Auto / Manual mode and edit the weekly programme remotely from anywhere.
4. What happens to my settings during a power cut?
User settings — the weekly programme, set temperatures, operating mode and child-lock status — are stored in non-volatile memory. When the power returns, the thermostat resumes the last programme and set temperature automatically; no re-pairing or re-programming is needed.
5. What does the external floor sensor do, and how is it wired?
The optional external NTC floor sensor (10 kΩ at 25 °C, β = 3950) connects to terminals 6 and 7 and is laid beneath the floor finish. It lets the thermostat control the actual floor temperature rather than just the air temperature, which protects wood, laminate and LVT floors from overheating. Select internal or external sensing in the device settings or in the app.
6. Will it work with my boiler and underfloor heating?
Yes — the 3 A dry-contact version is designed exactly for gas wall-hung boilers and water underfloor heating zones: its volt-free NO/NC contact connects to the boiler’s call-for-heat input or the zone valve, the same way a conventional room thermostat does. Most wall-hung boilers and standard zone valves accept a volt-free contact, but confirm the boiler’s switching requirement with us at order time.
7. Which rooms and buildings is it suitable for?
The faceplate suits homes, apartments, offices, hotels, serviced apartments, shops and showrooms. The push-button design works well in family spaces where children or elderly users operate the heating daily, while the app and weekly programme suit buildings that need scheduled, energy-conscious control. The standard 86×86 mm back-box footprint also makes it an easy retrofit into existing thermostat positions.
8. What is the warranty and after-sales support?
Every SunAura piano-key thermostat carries a 2-year standard warranty, with direct after-sales support from our Qingdao engineering team by WhatsApp — spare parts, pairing help, wiring checks and commissioning guidance in English, German, French and Chinese. OEM and distribution customers also get private-labelling, packaging and drop-ship logistics support to 50+ countries.
Sourcing a piano-key WiFi thermostat for hydronic heating where occupants prefer real push-buttons over glass, or a push-button retrofit thermostat for wall-hung boilers that drops into an existing 86 mm back box? The SunAura piano-key LCD thermostat combines three tactile keys (M, up, down) with full app scheduling, and is offered as a 16 A direct-switching version for electric underfloor heating or a 3 A volt-free dry-contact version for water underfloor and gas boilers. Below are our factory-direct purchasing terms and the long-tail questions installers and hotel buyers ask most.
How to Buy the Piano-Key Thermostat — Factory-Direct Pricing
SunAura Thermal supplies the piano-key thermostat directly from our Qingdao factory to distributors, heating contractors, hotel procurement teams and private-label brands in 50+ countries. Wholesale pricing is tiered by finish (champagne or white), version (16 A electric or 3 A dry-contact) and quantity, and MOQ depends on your project mix — send us your 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 compliance documentation is supplied with every order. Evaluation samples are available before bulk purchase; the sample and courier charge is confirmed per enquiry, and drop-ship parcels can be sent directly to your installation crew.
| Item | Typical factory-direct term |
|---|---|
| MOQ | MOQ and pricing depend on version (16 A / 3 A) and quantity — send your enquiry for a same-day quotation |
| Bulk discount | Tiered price breaks from small trial orders to full-container shipments |
| Lead time | Stock versions ship quickly after payment confirmation; private-label orders vary with packaging |
| Samples | Evaluation samples in champagne or white finish; sample and courier cost confirmed per enquiry |
| OEM / ODM | Private-label logo, custom faceplate colour, pre-loaded weekly programmes and packaging |
| Datasheet & documents | Full technical datasheet — supply voltage class, settable range, control accuracy, protection rating and housing material — provided on request before order confirmation |
Request a quote by contacting our sales team or messaging us on WhatsApp, and tell us whether each room runs electric floor heating, water underfloor or a gas wall-hung boiler so we recommend the correct version per zone. The full controller line-up is listed in our thermostats and controls category — for comparison, the K1 simple LCD wall thermostat suits budget electric-heating rooms, while the LED side-button SDM5 thermostat is a popular companion on mixed projects.
Retrofit, Hotel & OEM Notes
The standard 86×86 mm faceplate (14 mm flush / 26 mm total depth) is designed for quick retrofit into most existing thermostat back boxes, so hotel and apartment refurbishments can upgrade scheduling and app control without replastering. The child lock protects unoccupied hotel rooms, the antifreeze setting protects pipes and the boiler during winter closure, and the physical keys let guests adjust the temperature without an app or training. OEM customers can ask for a custom faceplate colour, private-labelling and a pre-loaded weekly programme matched to their own installation manual; the complete datasheet and compliance pack are provided on request before order confirmation.
More Frequently Asked Questions
12. Do I need an electrician to replace my old thermostat with this piano-key model?
We recommend a qualified electrician or heating engineer for the swap: isolate the supply, label the existing wires, then re-wire the back plate according to your heating type — mains to terminals 1/2 and the electric load to terminals 4/3 on the 16 A version, or the volt-free NO/NC dry-contact terminals for water heating and boilers. The external NTC floor sensor (10 kΩ at 25 °C, β = 3950) connects to terminals 6 and 7 if required. A printed wiring diagram and installation guide ship with every unit, and our engineers are available by WhatsApp for remote commissioning.
13. Which app does it use, and does it work on both iOS and Android?
The thermostat pairs over the 2.4 GHz WiFi band with the Tuya-compatible smart home app on iOS and Android, where you can view room and set temperature, switch Auto / Manual mode, edit the weekly programme and toggle antifreeze and child lock remotely. It also works with the supported Tuya-compatible voice assistants for hands-free adjustment. If your hotel or project needs a white-labelled app experience for OEM branding, ask our sales team about the available customization options.
14. Where can I see the full electrical specifications before ordering?
The complete technical datasheet — including supply voltage class, settable temperature range, control accuracy, protection rating and housing material — is provided on request before order confirmation, alongside compliance documents. Start by sending our sales team your load details with your destination market; typical installation and delivery questions are also covered on our main FAQ page, and real residential, hotel and commercial deployments are shown in our applications gallery. For rooms where humidity monitoring is also wanted, pair the thermostat with our indoor thermometer-hygrometer.
Why choose a piano-key thermostat?
The piano-key design gives large, raised, tactile buttons with clear labels u2014 easier to use than a flat touchscreen in low light or by elderly users. The LCD shows room temp, setpoint, mode and time at a glance.
Which heating systems does the piano-key thermostat handle?
It supports three load types: electric underfloor heating at 16 A resistive (film, mat, cable), gas boiler on/off at 3 A, and water-underfloor / radiator valve at 3 A dry contact.
Does it work with WiFi and voice?
Yes. The piano-key thermostat joins 2.4 GHz WiFi and pairs with the Tuya Smart / Smart Life app for remote scheduling and monitoring. Alexa and Google Home voice control are supported.
Is a floor sensor included?
Yes. An external NTC floor probe (3 m lead, included) connects to the screw terminals, letting you limit floor temperature to protect wooden floors or run on floor-sensor mode.
Can it be branded for our brand?
Yes. SunAura supplies this piano-key thermostat as an OEM/ODM product with custom logo on the fascia, private-label packaging, multilingual firmware and volume pricing. MOQ per project.
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