Cable‑free Electric Heating Retrofit Solution: Wireless Thermostat Kit

Overview

Traditional wired retrofits are slow and expensive. Our wireless RF solution cuts labor cost by 50% and installs in 30 minutes – no wall chasing, no disruption.

Conventional retrofits need control wires – drilling, plastering, painting, and high electrician fees (€60‑120/h). Our 16A receiver connects directly to existing power behind the heater; the battery‑powered transmitter mounts anywhere. No new wires, no structural damage, no tenant relocation. Installation time drops from 3 hours to 30 minutes per unit.

Key Capabilities:

● No‑wire installation
● 16A high load (3500W)
● 868MHz RF through concrete walls
● Battery transmitter (2×AAA, 1‑2 years service life)
● One transmitter controls up to 8 receivers
● Fail-safe mechanism: signal loss = heating off automatically

Solution Architecture

The system decouples control from power using 868MHz RF. A 16A high‑load receiver installs inside the heater’s junction box; a battery‑powered wireless transmitter (wall‑mount or free‑stand) sends ON/OFF commands. No gateway, no internet, no control wire. Our Wireless RF vs. Traditional Wired System

Aspect	Traditional Wired	Saswell Wireless RF
Installation time per unit	3-4 hours	25-30 minutes
Labor cost (€80/h)	€240-320	€30-40
Wall chasing / repair	Required (dust, noise, painting)	None
Control wire	Must be laid	None
Tenant disruption	Relocation or on-site construction disturbance	No disruption, residents stay
Signal penetration	—	868MHz through 2-3 concrete walls

Core Selling Points

● 30‑minute installation-6x faster than wired retrofits. Learn how contractors cut labor cost by 50% →

● 868MHz RF reliability-Penetrates concrete walls, no WiFi dependence. See technical specifications →

● Battery‑powered freedom -No backbox, no electrician for control wiring. Explore use cases for social housing →

Application Scenarios

Social Housing Bulk Energy Upgrade

Challenge: Housing authorities must improve energy efficiency to meet regulations, but budgets are tight. Tenants cannot relocate during construction, and traditional rewiring costs €200-300 per unit, causing complaints and delays.

Our Solution: Wireless RF kit installs in 30 minutes per unit – no tenant relocation, no dust, no noise. Labor cost drops to €40 per unit (70% saving). Meets CEE subsidy requirements for further cost reduction.

● Cable-free, tenant-friendly, 16A high load, bulk order discounts

See social housing retrofit data →

Attic, Garage, or Extension – Long-Distance Spaces

Challenge: These spaces are often far from the electrical panel. Traditional wiring requires long cable runs, wall chasing, and high material/labor costs – sometimes exceeding the heater’s value. Many owners skip thermostat control, wasting energy.

Our Solution: Wireless RF kit needs no control wire from the panel. Install the receiver near the heater (connected to existing power), and place the battery transmitter anywhere in the room (wall-mount or desk). 868MHz signal penetrates walls. Total installation cost is one-third of traditional wiring.

● No long-distance wiring, 868MHz wall penetration, low-cost zone control

View wireless RF technical specs →

Heritage & Listed Buildings – Non-Invasive Retrofit

Challenge: Conservation laws prohibit wall chasing, drilling, or altering original structures. Traditional wiring is impossible. Owners are forced to live without proper thermostat control or inefficient heating.

Our Solution: Fully non-invasive wireless RF – receiver hides behind the radiator (no visible change), transmitter attaches to wall with adhesive or stands on a desk. No wall work whatsoever. Preserves building original appearance while adding smart zone control and improving energy efficiency.

● Non-invasive installation, zero wall chasing, battery transmitter (no backbox), signal through walls

Read heritage building installation guide →

Heritage & Listed Buildings Non-Invasive Retrofit

Need a Solution for Commercial Buildings?

Reduce energy costs, break brand lock-in, and achieve LEED/WELL with our open, decoupled VAV system. 1/3 the price of Tier-1 brands, laptop-free tuning,
and native BACnet integration.

Explore Commercial VAV Solution

Advantages

Core Advantages of Saswell Wireless RF Heating Retrofit Solution:

30-Minute Installation

6x faster than wired retrofits. From 3 hours down to 30 minutes per radiator.
50-70% Labor Savings

No wall chasing, no plastering, no painting. Cut electrician hours by more than half.
No Tenant Disruption

Tenants stay in place. Zero noise, zero dust, zero relocation costs.
One-to-Many Scalability

One transmitter controls up to 8 receivers. Ideal for open‑plan offices or corridors.
Long Battery Life

2×AAA batteries last 1-2 years. Low maintenance, no frequent replacements.
No Internet Required

868MHz RF works independently. No WiFi, no gateway, no cloud subscription.

Product Parameters

Wireless RF Receiver + Transmitter Kit

SAS936FHL-7-DFZ

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SAS936FHL-7-DFZ

● Power supply: 2x1.5V AA alkaline batteries(LR6)

● Battery life: 1 year

● Temperature display: 0~50°C

● Temperature setting range: 5~30°C

● Temperature display accuracy: 0.1°C

● RF wireless transmit range: 100m in open air

● Zigbee wireless transmit range: 30m in open air

● Dimensions: 100*100*19mm

● Storage temperature & humidity: -10~60°C, 25~90%RH (non condensation)

● Operation temperature & humidity: 0~50°C, 25~90%RH(non condensation)

SAS2024DE

● Power source: 100-240VAC 50/60Hz

● Output(Relay): Imax 16A

● RF frequency: 868MHz

● RF transmission distance: 100m in open air

● Protection Level: IP21

● Compatibility: Compatible with all class II electric radiators

Battery‑Powered Transmitter

SAS936FHL-7-DFZ

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● Power supply: 2×1.5V AA alkaline batteries (LR6)
● Battery life: 1 year
● Temperature display: 0~50°C
● Temperature setting range: 5~30°C
● Temperature display accuracy: 0.1°C
● RF wireless transmit range: 100m in open air
● Zigbee wireless transmit range: 30m in open air
● Dimensions: 100*100*19mm
● Storage temperature & humidity: -10~60°C, 25~90%RH (non condensation)
● Operation temperature & humidity: 0~50°C, 25~90%RH (non condensation)

16A High‑Load Receiver

SAS2024DE

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● Power source: 100-240VAC 50/60Hz
● Output(Relay): Imax 16A
● RF frequency: 868MHz
● RF transmission distance：100m in open air
● Protection Level: IP21
● Compatibility: Compatible with all class Il electric radiators

Get In Touch

Contact our friendly Customer Service team for any Question,Concern, or Suggestion. We'd love to hear from you!

Headquater hotline: +86 755 61218391

Headquater email: info@saswell.com

MENA tech support hotline: +97155 6743682

MENA tech support email: support@saswell.com

Cable-Free Electric Heating Retrofit – Wireless RF Solution

Overview

Solution Architecture

Application Scenarios

Advantages

Product Parameters

Wireless RF Receiver + Transmitter Kit

Battery‑Powered Transmitter

16A High‑Load Receiver