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SASWELL OpenTherm thermostat series for Boiler Plus compliance

WHB Series Boiler Thermostats

From basic on/off to OpenTherm, with Matter, Zigbee, Wi‑Fi, RF, wired or wireless, and S/Y‑Plan compatibility.
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Home Product Boiler Thermostats
Product Lineup

Boiler thermostats are the core intelligent components of gas‑fired heating systems. They regulate boiler on/off and combustion status by precisely monitoring indoor temperature — replacing traditional coarse temperature control methods. WHB Series Boiler Thermostats cover the full spectrum: from basic mechanical and electronic digital on/off control, to wire‑free RF models, Wi‑Fi smart connected units with remote access, and OpenTherm‑enabled thermostats that support modulating control. A diverse product range that serves as the ideal starting point for building a differentiated smart heating portfolio.

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Selection Guide

Choose the right boiler thermostat for your project — from communication protocols and control logic to region‑specific system compatibility.
Which IoT Protocol Fits Your Project?
Wi‑Fi, Zigbee, and Matter each serve different deployment scenarios. Use the comparison below to identify the best fit for your project — based on gateway dependency, power consumption, offline reliability, networking capacity, and ecosystem compatibility.
Comparison of Wi-Fi, Zigbee and Matter protocol solutions for boiler thermostats
Technical Specs Wi-Fi (2.4GHz) Zigbee 3.0 Matter (Over Thread/Wi-Fi)
Gateway No Gateway Needed Requires Zigbee Hub Requires Border Router
Power High (Wired/Frequent Battery) Ultra-Low (2yr+ Battery) Low (Thread Optimized)
Offline Reliability Low (Cloud-Dependent) High (Local Automation) High (Local Control)
Networking Limited (~20 devices) Super Mesh (100+ devices) Self-healing Mesh
Ecosystem Brand-Specific App Gateway Dependent Native Apple/Google/Alexa


Pro Tip from SASWELL HVAC Engineers

● For Retailers: Wi‑Fi is the top choice for mass‑market consumers due to its "Plug‑and‑Play" nature.

● For Integrators: Zigbee 3.0 is the industry standard. Its Local Automation ensures heating remains functional even during internet outages.

● For Innovation Leaders: Matter represents the future, offering users ultimate freedom without proprietary app limitations.

For a deeper dive into each protocol‘s technical specs and use cases,

read our full comparison guide →

On/Off or OpenTherm? Choose Your Control Logic
On/Off and OpenTherm represent two fundamentally different control logics. The choice between them impacts energy efficiency, boiler lifespan, and regulatory compliance.
Standard On/Off:Simple logic, similar to a light switch. The boiler runs at full power until the set point is reached, then shuts down. This leads to water temperature fluctuations and higher fuel consumption. Best suited for projects where compatibility with all dry‑contact boilers is the primary requirement.
OpenTherm (OT):A sophisticated "two‑way conversation" between the thermostat and the boiler. It commands the boiler to adjust its flame size (Modulation) in real‑time. As the room reaches target temperature, the flame lowers, keeping the boiler in its most efficient condensing zone. Extends boiler lifespan, improves gas efficiency by 5%‑15%, and meets Boiler Plus requirements.
Want to see which thermostats support OpenTherm in our product lineup? Read the full comparison →
WHB series smart boiler thermostat, OpenTherm modulation compatible, accurate temperature regulation, energy‑saving heating control
S‑Plan or Y‑Plan? Choose Your System Layout
In the UK, S‑Plan and Y‑Plan are the two dominant configurations for boiler systems. These dual‑channel controllers provide independent scheduling for Central Heating (CH) and Domestic Hot Water (DHW) through a single device.
Specifically designed for UK S‑Plan and Y‑Plan heating systems. These dual channel controllers provide independent scheduling and control for both Central Heating (CH) and Domestic Hot Water (DHW) through a single device — the perfect digital upgrade for traditional mechanical programmers.
Learn more about how dual channel controls work in S‑Plan and Y‑Plan systems →
WHB series boiler thermostat dual‑channel control, central heating and domestic hot water DHW independent management
Not certain which control architecture applies?
Our engineering team offers complimentary project-specific matching.
Request a Site Match

Connectivity & Integration

Saswell boiler thermostats integrate into your smart home or energy management ecosystem as a deeply compatible hardware component — not a competing platform.

Protocol-Ready:
Matter, Zigbee, Wi-Fi, and OpenTherm — production-proven across millions of devices.

HVAC-Ready:
We handle regional system complexities — UK S/Y-Plan, European OpenTherm, North American line-voltage.

Integration-Ready:
Clean APIs and protocol docs give your platform full control. We stay in the hardware layer. You own the user experience.

Control architecture for boiler thermostats with Wi-Fi, Zigbee and Matter support

Global Market Readiness

Market Positioning
Saswell boiler thermostats are purpose-built for hydronic heating markets, fully compatible with European and Asia-Pacific installation practices and system architectures.
Regional Strength
With deep roots in Europe and Asia Pacific, our mature manufacturing and compliance processes enable fast market access and shorter time-to-market.
Compliance Standard
RoHS, REACH, and WEEE are global standards, not add-ons – eliminating extra certification costs while ensuring consistent reliability.
Global market compliance certifications for WHB series boiler thermostats
Get in Touch

Contact our friendly customer service team for any questions, concerns, or suggestions. We'd love to hear from you.


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