SAS921FHL Digital LCD Electric Heating Thermostat

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Key Functions

Modern LCD Interface — High-Contrast Display with Physical Buttons

Heavy-Duty Performance — 16A Load Supports Systems up to 3500W

Lower Energy Costs — 7-Day Independent Daily Scheduling

Enhanced Comfort — Dual Sensor Control for Room & Floor

On-Time Heating — Intelligent Recovery Technology

Energy Saving — Open Window Detection

Front view of SAS921FHL digital LCD electric heating thermostat

Left side view of SAS921FHL digital LCD electric heating thermostat

Right side view of SAS921FHL digital LCD electric heating thermostat

Home Electric Heater Thermostats SAS921FHL Digital LCD Electric Heating Thermostat

Product Overview

The SAS921FHL Digital LCD Electric Heating Thermostat combines a modern high‑contrast LCD with durable physical buttons, delivering clear visibility and reliable operation. As a core member of the FHL Series, it supports up to 3500W loads with dual‑sensor precision, 7‑day scheduling, and smart energy‑saving features for residential and commercial projects.

Recommended reading: View FHL Series Electric Heating Thermostats

SAS921FHL digital LCD electric heating thermostat for electric heating systems

Product Features

High-Contrast Display with Physical Buttons

The high‑contrast LCD delivers sharp, easy‑to‑read numbers and status icons even in bright sunlight or dim corners, while tactile buttons provide positive click feedback for error‑free programming—keeping user frustration and support calls low.
16A Load Supports Systems up to 3500W

Handles high‑power electric heating systems with ease, giving you the confidence to specify one model across diverse residential and light‑commercial projects without overloading concerns.
7-Day Independent Daily Scheduling

Each day can be programmed with its own temperature schedule, adapting to different weekday routines and weekend patterns—delivering tailored comfort while minimizing unnecessary runtime.

Dual Sensor Control for Room & Floor

Monitors both air and floor temperature simultaneously, preventing floor overheating while ensuring the room reaches your desired warmth quickly. Protects sensitive flooring and improves comfort.
Intelligent Recovery Technology

Learns your system's heating characteristics and activates the heater in advance, ensuring the target temperature is reached right at your scheduled time—no more waiting in the cold.
Open Window Detection

Instantly detects rapid temperature drops caused by open windows and automatically pauses heating, preventing energy waste and saving your customers money on every bill.

Product Selector

Model No.

Heat/cool

Heat only

Pipe

Passive and linkage output

Programmable

Window card

Room card

External Sensor

Modbus RTU

WIFI

Power

Manual

SAS922FHL-7

√

220VAC

download

SAS922FHL-7-WIFI(TY)

√

220VAC

download

Product Parameters

SAS921FHL digital LCD electric heating thermostat product front view

Power source: 100-240VAC 50/60Hz

Maximum load electric current: 16A/250VAC

Room temperature setting range: 5℃~ 35℃

External sensor control range: 5℃~ 70℃(not standard)

Display accuracy: 0.1℃

Working environment temperature: 0℃~ 50℃

The storage temperature: -10℃~ 60℃

Dimensions: 88mm x 88mm x 13mm

External sensor: NTC100K or NTC10K (optional)

Wiring diagram for SAS921FHL digital LCD electric heating thermostat

Product Application Scenarios

The SAS921FHL is widely deployed in residential homes, rental apartments, small office spaces, and retail environments. It integrates seamlessly with the FHL Series ecosystem, working with floor sensors and external controls. Suitable for underfloor heating, electric radiators, and high‑power systems up to 3500W. A reliable choice for both new installations and energy‑efficient retrofits.