230V Large Digital Adjustable Button Gas Boiler Non-programmable Thermostat for Underfloor Heating
ST2603 answers a specific complaint: digital stats that older occupants find hard to use. It keeps a digital LCD and an NTC sensor for accuracy, but the setpoint is changed with one large dial instead of a menu. HEAT, COOL and OFF are selectable, with frost protection on OFF, and the measuring range runs 0 C to 40 C in 0.1 C steps.
Key Benefits
- One large dial replaces menu navigation, which cuts support calls in elderly housing
- Digital NTC measurement with a 0.1 C resolution behind a simple interface
- Frost protection stays active in the OFF position
- Adjustable switching sensitivity tunes cycle rate to a slow underfloor slab
- Calibration of -3 to +3 C corrects a warm or draughty mounting position
Problems It Solves
- Occupants unable to operate multi-button digital thermostats
- Underfloor slabs overshooting because the cycle rate cannot be tuned
- Mechanical dial accuracy drifting over years of service
- Pipe freezing in rooms switched off during cold spells
Who It Is For
- Underfloor heating installers who need a simple room control per zone
- Care home and hotel operators reducing service calls
- Merchants stocking a like-for-like replacement for mechanical dials
- OEM buyers wanting a dial-fronted product in a digital range
Technical Features
- Non-programmable operation with a large dial adjustable button
- Measuring range 0 C to 40 C in 0.1 C, setpoint range 5 C to 35 C in 0.5 C
- Display accuracy +/-1 C at 20 C
- Switchable voltage 24 V AC/DC up to 250 V AC at 50 Hz
- Switchable current 6 A with 2 A inductive load
- NTC sensor with -3 to +3 C calibration adjustment
- HEAT / COOL / OFF selection with frost protection
- Anti-flammable PC and ABS housing, white, RoHS CE ISO
Specifications
| Model | ST2603 |
| Programmability | Non-Programmable |
| Power Supply | DC 2 x AAA 1.5V Alkaline batteries |
| Switchable Voltage | 24 V AC / DC,…250 V AC; 50 Hz |
| Switchable Current | 6 A (2 A inductive load) |
| Temperature Range | 0°C-40°C in 0.1°C |
| Setpoint Range | 5°C-35°C in 0.5°C |
| Display accuracy | ±1°C (at 20°C) |
| Sensor | NTC |
| Relay | Omron |
| Backlight | White/Customized |
| Color | White |
| Material | Anti-flammable PC +ABS |
| Dimension | 130 x86 x30 mm |
| Installation | Wall Mounted |
| Application | Hotel/Office House Indoor |
| Type | Floor Heating Parts |
| Certification | RoHS CE ISO |
| Warranty | 1 Year |
| After-sale Service | Online technical support, Return and Replacement |
Specifications are taken from the manufacturer data for this model. Confirm the exact configuration with us before you order.
Application Scenarios
- Underfloor heating in hotels and offices where guests adjust the temperature
- Retirement and assisted living accommodation
- Indoor house zones replacing a worn mechanical dial stat
- Office rooms that need local adjustment without a programme
Quality Control
- Dial torque and detent feel checked on every unit
- Switching contact load tested before packing
- Sample audit against a reference probe at 20 C
Customisation Options
- Backlight colour white or customised
- Dial cap colour and logo marking
- Setpoint range restricted for hotel and care projects
- Buyer specific manual, carton and barcode
How It Compares
Installing And Commissioning
Step 1
Isolate the supply and mount the backplate on an internal wall clear of heat sources
Step 2
Land the switched conductors within the 24 V AC/DC to 250 V AC range
Step 3
Fit 2 x AAA alkaline batteries in the control section
Step 4
Set switching sensitivity higher for a slow underfloor slab, lower for radiators
Step 5
Turn the dial to the target temperature and confirm the zone responds
230V Large Digital Adjustable Button Gas Boiler Non-programmable Thermostat for Underfloor Heating: Buyer Questions
Is there any programming at all on the ST2603?
No. It is non-programmable by design. The occupant sets a temperature with the dial and the stat holds it.
Can it be used on underfloor heating?
Yes. Switching sensitivity is adjustable, which lets you slow the cycle rate to match a heated slab.
What is the switching capacity?
6 A with 2 A inductive load, across 24 V AC/DC up to 250 V AC at 50 Hz.
What batteries does it use?
2 x AAA 1.5V alkaline batteries.
Can the adjustment range be limited?
Yes. We can narrow the setpoint range at the factory for hotel and care home projects.
Do you supply it with our brand on the front?
Yes. Housing colour, dial cap, front label, manual and carton can all carry your branding.
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