
A complete thermostat portfolio for surface-mounted FCUs — covering every control logic from traditional On/Off to 0-10V modulating, EC fan, and BMS-native connectivity. All models share a unified on-unit mounting design for seamless OEM integration, with select models supporting LoRaWAN and RS485 for energy metering applications.









| Dimension | EC Fan + On/Off Valve | EC Fan + Modulating Valve | AC Fan + On/Off Valve | AC Fan + Modulating Valve |
| Fan Control | Stepless (0-10V) | Stepless (0-10V) | 3-Speed (220VAC) | 3-Speed (220VAC) |
| Valve Control | On/Off (220VAC) | Modulating (0-10V) | On/Off (220VAC) | Modulating (0-10V) |
| Control Precision | Medium (air precise, water coarse) | High (both air and water precise) | Basic (stepped air, on/off water) | Medium (stepped air, water precise) |
| Max Load Current | 6A | 3A | 10A | 6A |
| Energy Efficiency | Excellent (EC saves, but valve loss) | Best (EC + modulating, highest system efficiency) | Moderate (AC fan less efficient) | Good (AC moderate, but valve optimizes) |
| Recommended Scenarios | Boutique hotels, high-end apartments (stepless air, moderate water) | 5-star hotels, Class A offices (ultra comfort and saving) | Retrofit, budget hotels (high load, cost-first) | Hospitals, schools (precise water, traditional system) |
| VWF/VPF Compatibility | Limited (On/Off not for continuous) | Fully compatible (modulating ideal) | Not recommended | Compatible (valve adjustable, fan fixed) |
| Cost Positioning | Mid-high (EC cost) | High (EC + modulating, most expensive) | Budget (AC mature) | Mid (AC fan, but modulating adds cost) |
| Installation Ease | Fairly easy (existing valve, but EC signal) | More complex (0-10V wiring and valve match) | Simplest (traditional wiring) | Moderate (0-10V valve, fan unchanged) |
| Metering-Ready | Depends on model | Depends on model | Depends on model | Depends on model |
Pro Tip: How to Optimize Your Selection
Choose EC + Modulating Valve for premium projects prioritizing energy efficiency and comfort. Choose AC + On/Off for cost-sensitive retrofits with high-load requirements. For energy metering and sub-billing applications, select models with LoRaWAN or RS485 connectivity.
BMS Protocol Integration Native support for standard industrial protocols including Modbus RTU (RS485) and BACnet MS/TP for effortless building management system connection.
IoT and Wireless Metering Advanced LoRaWAN connectivity enabling long-range wireless data transmission and real-time energy consumption tracking.
Hospitality Automation Integrated hotel keycard switching and remote external sensor inputs for intelligent occupancy-based energy management.
Contact our friendly customer service team for any questions, concerns, or suggestions. We'd love to hear from you.
Headquarters Hotline: +86 755 61218391 Headquarters Hotline +86 755 61218391
Headquarters Email: info@saswell.com
Tech Support Email: support@saswell.com
