Smart Multi-Zone Hydronic Control with Single-Master WiFi

Overview

Whole-building App connectivity without WiFi thermostats in every room --- lower cost, simpler commissioning, reliable control.

Modern residential projects increasingly require smart zoning and App-based control as standard features. Conventional solutions often rely on installing a WiFi thermostat in every room, increasing hardware investment, network dependency, and commissioning complexity.

This solution eliminates multiple WiFi endpoints through a shared-connectivity architecture. Built around the SAS931WCH (wired BUS) and SAS936WCH (wireless Zigbee) multi-zone control kits, it delivers whole-building App access, automatic heating/cooling synchronization, and dependable communication --- with the flexibility to choose wired or wireless based on project requirements.

Core Capabilities

● Single-Master WiFi Connectivity
● Wired & Wireless Deployment Options
● Up to 8 Thermostats & 8 Zones
● Automatic Heat/Cool Synchronization

Wired and wireless hydronic thermostat application scene

Solution Architecture

A flexible architecture supporting both wired BUS and wireless Zigbee --- one shared platform, two deployment methods.

：SAS931WCH wired hydronic underfloor heating system multi-zone application

Metric	Saswell Smart Multi-Zone Solution	Conventional Wired Setup	Full-WiFi Network
App Remote Control	✓ Whole-building unified access	✗ No remote access	✓ Per-device access
WiFi Thermostats Required	1 (Master only)	0	Up to 8
Network Configuration Load	Minimal (1 device)	N/A	High (multiple devices)
Seasonal Changeover	✓ Automatic system-wide sync	✗ Manual per-zone adjustment	✗ Manual per-device setup
Communication Reliability	High (wired PLC or Zigbee)	High	Medium (WiFi-dependent)
Installation Complexity	Low (polar-free wiring or no cabling)	Medium	High
Hardware Investment	Optimized	Lowest	Highest
Ideal Project Type	New build + Retrofit	New build only	Small footprint, good WiFi coverage

Architecture Highlights

Single-Master WiFi Architecture

One WiFi-enabled Master thermostat provides App connectivity for the entire system. Slave thermostats (wired BUS or wireless Zigbee) maintain independent room-level control without requiring their own WiFi modules — reducing hardware cost and network complexity.

Dual Deployment Options — Wired or Wireless

The same smart zoning logic can be deployed via wired BUS (SAS931WCH) for new construction or via wireless Zigbee (SAS936WCH) for retrofit projects. Both deliver identical user experience, supporting up to 8 thermostats and 8 zones.

Automatic System-Wide Synchronization

When a changeover is initiated, synchronization commands propagate automatically across all zones via PLC BUS or Zigbee — ensuring consistent system behavior throughout the building without manual intervention.

Application Scenarios

New Construction Developments --- Cost-Optimized Smart Zoning

Challenge: Today's homebuyers increasingly expect App-based heating control as a standard feature. However, equipping every room with an individual WiFi thermostat significantly increases hardware costs, network complexity, and commissioning time.

Our solution: The wired BUS architecture (SAS931WCH) enables up to eight zones to share a single WiFi connection through a Master/Slave network. The 2-wire non-polarity BUS eliminates wiring errors and reduces labor costs, delivering full-home smart control with the cost profile of a wired system.

● Single-Master WiFi Architecture

● Whole-Building App Connectivity

● Reduced Hardware & Commissioning Costs

Living room hydronic floor heating application scene

Retrofit & Renovation Projects --- Cable-Free Smart Zoning

Challenge: In retrofit projects, running new control wires to every room is often expensive, disruptive, or simply impossible due to building constraints. Homeowners want smart zoning but cannot justify the cost and hassle of re-wiring.

Our solution: The wireless Zigbee architecture (SAS936WCH) delivers the same single-Master WiFi experience without running a single new cable. Slave thermostats communicate with the wiring centre wirelessly --- ideal for heritage buildings, apartments, and any project where cabling is impractical.

● No New Cabling Required

● Same App Experience as Wired System

● Ideal for Heritage & Constrained Buildings

European villa living room hydronic heating application scene

Need heating + cooling for year-round comfort?

Explore our Pure Radiant Heating & Cooling Control Solution --- delivering both heating and cooling through a single underfloor system without fan coil units.

Contact Our Team Explore Pure Radiant Solution

Advantages

Shared WiFi Connectivity

Provide App access for the entire building through a single WiFi-enabled thermostat, eliminating the need for multiple connected devices and reducing network configuration complexity.
Flexible Deployment --- Wired or Wireless

Choose wired BUS for new construction with pre-installed cabling, or wireless Zigbee for retrofit projects where running new wires is impractical. Both deliver the same user experience and system performance.
Lower Total Cost of Ownership

Fewer WiFi thermostats, faster installation, and simplified commissioning reduce upfront project costs --- while a streamlined architecture lowers long-term maintenance expenses.

Related Products

SAS931WCH Wired Multi-Zone Hydronic Thermostat and Wiring Centre Kit

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Hydronic Thermostat

Power supply and signal input: DC12 ~ 18V carrier non-polarity input
(power supply wiring control centre, maximum current 100mA)

Storage environment temperature and humidity: -10 ~ 60°C, 0 ~ 90% RH (non-condensing)

Working environment temperature and humidity: 0 ~ 50°C, 0 ~ 80% RH (non-condensing)

Temperature display range: 0 ~ 50°C

Display accuracy: 0.1°C

Size: 86x86x13mm

Protection level: IP21

WIFI antenna emission frequency(master controller): 2.4GMHz

WIFI wireless transmission distance(master controller): 60M in the open area

Wiring control centre

Power source: 100-240VAC 50 / 60Hz (maximum current 10A)

Storage environment temperature and humidity: -10 ~ 60°C, 0 ~ 90% RH (non-condensing)

Working environment temperature and humidity: 0 ~ 50 °C, 0 ~ 80% RH (non-condensing)

Size: 298 X 88 X 66mm

IP rating: IP40

SAS936BWCH Wireless Multi-Zone Hydronic Thermostat and Wiring Centre Kit

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Hydronic Thermostat

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

Battery life:1 year

Temperature display: 0~50°C

Temperature setting range: 5~50°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*19.6mm

Wiring Centre

Power source:100-240VAC 50/60Hz

max current:10A

Load current output:250VAC 8(5)A

Dimensions:298 x 88 x 64mm

Get in Touch

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

MENA Tech Support Hotline: +97155 6743682

MENA Tech Support Email: support@saswell.com