LCD Gas Boiler 230V Non-programmable Digital Wired Gas Boiler Heating Thermostat for HVAC System
ST2305 is a wired 230V room thermostat for gas boiler and radiator systems where the specification asks for a switch, not a schedule. A slider selects HEAT, COOL or OFF, and the OFF position keeps frost protection active. The contact is rated 8(2)A at 230VAC, so it drives a boiler relay directly, and the measuring range runs from 3 C to 37 C in 0.1 C steps with a setpoint range of 5 C to 35 C in 0.5 C steps.
Key Benefits
- 8(2)A 230VAC contact switches most domestic boiler relays without an interposing relay
- OFF position keeps frost protection live, so empty properties stay protected
- 0.5 C setpoint resolution gives finer control than a mechanical dial
- Room temperature calibration of -3 to +3 C corrects for a poor mounting position
- Flame retardant ABS and PC housing with RoHS, CE and ISO documentation
Problems It Solves
- Mechanical stats that drift and cannot be calibrated
- Frozen pipework in properties left unoccupied over winter
- Boiler relays that need an extra interposing relay because the stat contact is too small
- End users changing schedules they were never meant to touch
Who It Is For
- Boiler OEMs bundling a room stat with the appliance
- Heating merchants supplying the 230V replacement market
- Contractors fitting out buildings with a no-schedule control policy
- Importers needing RoHS and CE paperwork for a 230V product
Technical Features
- Wired 230V operation with a large clear LCD
- HEAT / COOL / OFF slider with frost protection in the OFF position
- Measuring range 3 C to 37 C in 0.1 C, setpoint range 5 C to 35 C in 0.5 C
- Maximum load 8(2)A 230VAC
- Room temperature calibration adjustment of -3 to +3 C
- Selectable backlight, blue or orange
- Over-heating protection
- Flame retardant ABS and PC housing, RoHS CE ISO
Specifications
| Model | ST2305 |
| Programmability | Non-Programmable |
| System Switch | heat/cool/off mode switch |
| Power Supply | battery |
| Maximum Load | 8(2)A 230VAC Max |
| Temperature Range | 3°C-37°C in 0.1°C |
| Setpoint Range | 5°C-35°C in 0.5°C |
| Screen | LCD display |
| Backlight | Blue or Orange |
| Material | Flame Retardance ABS+PC |
| Application | Villa, Hotel, Apartment, Office Building, Hospital, School, Mall, Sports Venues, Leisure Facilities, Supermarket |
| Type | Air Conditioning/Heating/HVAC Systems/Radiator/Ventilation/Other |
| Certification | RoHS CE ISO |
| Warranty | 1 Year |
| After-sale Service | Online technical support |
Specifications are taken from the manufacturer data for this model. Confirm the exact configuration with us before you order.
Application Scenarios
- Villas and apartments on a wall hung gas boiler
- Hotel rooms and office buildings on radiator circuits
- Schools and hospitals where a fixed comfort setpoint is policy
- Supermarkets and leisure facilities that run continuous occupancy
Quality Control
- Contact rating verified under load on the production line
- High voltage insulation test on every 230V unit
- Display and slider action checked before carton packing
Customisation Options
- Backlight fixed to blue or orange for the buyer's range
- Front label and logo printed to the buyer's artwork
- Setpoint range narrowed for hotel and institutional projects
- Instruction sheet and carton in the buyer's language
How It Compares
Installing And Commissioning
Step 1
Isolate the 230V supply at the consumer unit before opening the boiler terminal cover
Step 2
Mount the backplate at about 1.5 m on an internal wall away from radiators and draughts
Step 3
Land live, neutral and the switched boiler conductor on the marked terminals
Step 4
Set the slider to HEAT and confirm the boiler fires within the switching differential
Step 5
Apply a calibration offset if the reading differs from a reference thermometer
LCD Gas Boiler 230V Non-programmable Digital Wired Gas Boiler Heating Thermostat for HVAC System: Buyer Questions
What load can the ST2305 switch?
8(2)A at 230VAC maximum, which covers direct switching of most domestic boiler relays.
Does it protect against freezing when switched off?
Yes. The OFF position is a frost protection mode rather than a dead contact.
Can the room reading be corrected?
Yes, by -3 to +3 C in the calibration setting, which is useful where the only mounting position is warm.
Is it battery powered?
The switching side is 230V wired. The control electronics are battery supplied, so the display keeps working during a supply interruption.
Which certificates do you hold for this model?
RoHS, CE and ISO documentation is on file. Tell us your destination market and we will send the matching certificate.
Can we buy it under our own brand?
Yes. We provide OEM and ODM service including front label, housing colour, manual and carton.
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