测试

Product Selection Guide

How to Choose Your Hydronic Control Architecture?

While new construction projects seamlessly accommodate both individual wired components and our 12V bus systems, retrofits require a strategic balance. Opt for our cable-free wireless kits for rapid deployment with zero structural damage, or deploy the SAS931 12V Wired Bus Kit to guarantee 100% signal immunity in challenging architectural layouts.

SASWELL Hydronic underfloor heating control system architecture diagram

Metric / Spec	Individual Thermostats (Standard Wired)	SAS931 12V Bus Kit (Wired System)	SAS936 Wireless Kit (Cable-Free System)
Wiring Input	Line voltage (100-240VAC)	2-wire non-polarity bus (12V low voltage)	100% wireless communication
Ecosystem Logic	Universal open (mix with any brand)	Proprietary bundle (must use together)	Proprietary bundle (must use together)
Core Advantage	High sourcing flexibility	Absolute signal shielding & zero polarity risk	Zero wall routing & rapid deployment
Signal Stability	Standard wired reliability	100% physical immunity against electromagnetic interference	High-reliability encrypted RF for open layouts
On-Site Labor	Standard point-to-point wiring	Reduces wiring labor by up to 40% via non-polarity routing	Deployed in minutes without wall damage
Max Capacity	Dependent on third-party wiring hubs	Natively 8 zones (Cascade up to 64 zones)	Up to 8 zones per receiver hub

Pro Tip from SASWELL HVAC Engineers

For retrofit projects featuring thick concrete slabs, historic masonry, or multi-story layouts where RF signal attenuation is inevitable, we strongly advise against wireless alternatives. Deploying the SAS931 12V Bus Kit ensures a permanent, interference-free wired connection, while its 2-wire non-polarity architecture keeps additional on-site labor remarkably low.

Operating Heating Only, or a Reversible Cooling System?

Application A: Hydronic Underfloor Heating Only
If your system is designed exclusively for winter radiant heating, every standalone model and system kit on this page delivers flawless compatibility. Expect tight, energy-efficient temperature regulation for traditional gas boilers and air-to-water heat pumps alike.

Application B: Radiant Heating & Cooling (Reversible Systems)
If your project utilizes an air-to-water heat pump for summer radiant floor cooling (two-pipe reversible systems), standard standalone thermostats cannot be deployed. To eliminate the critical risk of floor condensation ("sweating floors"), you must specify either the SAS931 or SAS936 System Kit. These hubs feature dedicated humidity tracking and auto-cutoff logic engineered to intercept dew-point thresholds before moisture forms on floor surfaces.

Laboratory VAV system installation example: HDC218-VAV controller with pressure sensor and damper actuator

Gas Boiler or Air‑Source Heat Pump?
Flawless Plant-Room Interlocking.

Whether your schematic relies on a traditional wall-hung gas boiler, a modern air-to-water heat pump, or a centralized hybrid energy center, you can source from our catalog with absolute confidence. Every single thermostat and zone control kit featured here is equipped with voltage-free dry contacts for master plant linkage. The boiler or heat pump cycles perfectly in sync with room-by-room zone demands — ensuring zero compatibility guesswork and zero integration risks during commissioning.

Cleanroom VAV control: HDC218-VAV maintaining constant airflow and pressure with touchscreen HMI

Connectivity & Integration

To match modern smart home architectures and light commercial Building Management System (BMS) topologies, our hardware platform natively supports mainstream protocols including Wi‑Fi, Zigbee 3.0, and Z-Wave.

The SAS931/SAS936 central hubs feature Modbus RTU connectivity, allowing real-time multi-zone monitoring from a single centralized controller. Backed by open SDKs and well-documented APIs, we enable rapid, low-cost integration into private client clouds and third-party IoT platforms — drastically shortening your R&D development cycles and accelerating time-to-market for global brands and system integrators.

SAS965-HMI panel – laptop-free airflow calibration and PID tuning for HDC218-VAV controller in 5 minutes

Global Compliance & Market Access

All WHL Series thermostats are manufactured in ISO 9001:2015 and ISO 14001:2015 certified facilities, and fully audited under BSCI and ICS social responsibility frameworks.

Baseline Certifications (Standard Across All Models)

● UK & Europe: CE (EMC/LVD compliant) | UKCA Marked
● North America: FCC Certified (Electromagnetic compliance)
● Environmental: RoHS | REACH Compliant

Advanced Connectivity Compliance (Wi-Fi & RF Models)

● Wireless Spectrum: RED (Radio Equipment Directive) Certified
● UK Cyber-Security: 100% Compliant with the PSTI Act (Mandatory UK cybersecurity)
● BMS Cybersecurity: Engineered to meet EN 18031 technical standards

Project-Specific Certifications (Available Upon Request)

● Safety Listings: Ready for UL / ETL (North America) | TÜV / VDE (Europe)
● Supplementary Testing: PAHs screening available for bespoke enterprise tenders

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