Pure Radiant Heating & Cooling Control Solution for Heat Pump Homes

Overview

A single hydronic radiant floor network provides silent, efficient heating and cooling across multiple zones with native heat pump integration and flexible wired or wireless control.

Conventional systems add fan coil units for cooling — increasing cost, noise, and complexity. Our solution uses the same underfloor network for both seasons, delivering quiet comfort without extra indoor equipment.

This approach is ideal for temperate climates where gentle radiant cooling alone ensures summer comfort and rapid response is not required. See our guide on ERP‑compliant heat pump integration →

Core Capabilities

● Dual-season comfort
● Heat pump ready
● Multi-zone control
● Wired or wireless radiant thermostats
● No FCU required

Radiant system heating and cooling mode switching control diagram

Solution Architecture

Multi-zone thermostats, actuators, and heat pumps working as one integrated radiant control platform.The master controller coordinates seasonal mode selection — switching the entire system between heating and cooling through a single command. Both wired (SAS931WCH) and wireless (SAS936BWCH) thermostats support this changeover logic, receiving mode commands from the master or directly from the heat pump via dry contact interlock. Thermal actuators then regulate water flow to each zone through the wiring centre, enabling precise room-by-room comfort control throughout the building.

Heat pump radiant floor heating and cooling control principle diagram

Feature	Pure Radiant System (UFH Only)	Hybrid Radiant + FCU System	Advanced Radiant Climate Control System
Terminal Type	UFH only	UFH + FCU	UFH + FCU + capillary
Heating	✓	✓	✓
Cooling Performance	comfort cooling	fast cooling	precision climate control
FCU Required	—	✓	✓
Capillary Required	—	—	✓
Multi-Zone Control	✓	✓	✓
Changeover Logic	standard	intelligent	advanced
Dew-Point Algorithm	—	✓	✓
System Complexity	low	medium	high
Installation Cost	lower	higher	highest
Recommended Project Type	standard residential	premium residential	luxury & high-performance homes

Architecture Highlights

Centralised Hydronic Control Layer
Orchestrates multi-zone thermostats, thermal actuators, and heat pumps into a unified hydronic control platform, ensuring consistent system behaviour across the entire building.

Native Wired & Wireless Readines
The same architecture supports both wired (SAS931WCH) and wireless (SAS936WCH) deployment — without core system redesign.

Simplified Project Delivery
Fewer terminal types, fewer control devices, and a standardized architecture reduce installation, commissioning, and long-term service complexity. Explore our full range of WCH Series radiant thermostats for scalable residential projects.

Direct Heat Pump Signal Integration
Interfaces directly with air-to-water heat pumps via dedicated dry contacts or communication protocols, enabling accurate seasonal changeover, conflict-avoidance logic, and optimised system efficiency.

Application Scenarios

Heat Pump Homes — Summer Cooling Without FCUs

Challenge: Homeowners want summer cooling, but adding fan coil units means extra equipment, higher costs, and noise. They need a solution that delivers cooling without compromising the clean, minimalist aesthetic of their home.

Our solution: Use the same underfloor system for both heating and cooling — no fan coil units, no visible equipment, no additional indoor footprint. During summer, the reversible heat pump supplies chilled water through the floor circuits, providing gentle, silent radiant cooling that maintains comfort without air drafts.

● Heat pump ready

● Multi-zone

● No FCU

Radiant floor heating and cooling installation in residential living room without fan coil

Low-Energy Homes
Silent Climate Control Without Extra Devices

Challenge: Energy-efficient homes are designed for minimal energy consumption, but adding fan coil units for cooling introduces noise, maintenance, and additional system complexity that contradicts the passive house philosophy.

Our solution: Radiant heating and cooling operate silently with no moving parts, no filters to replace, and no fan noise. By using the floor slab as a thermal battery, the system maintains stable temperatures with minimal energy input — ideal for low-energy and passive house projects.

● Silent comfort

● Energy saving

● Room control

Radiant floor heating and cooling in passive house interior without fan coil

Premium Renovations — Invisible Cooling for Period Properties

Challenge: In period properties and premium renovations, preserving architectural character is paramount. Homeowners want cooling for increasingly warm summers, but installing fan coil units or visible terminals would compromise the interior design and heritage value.

Our solution: Cooling is delivered invisibly through the same floor circuits that provide heating — no wall-mounted units, no ceiling cassettes, no exposed pipework. For projects where running new control wiring is impractical, the wireless option (SAS936WCH) eliminates the need for cabling while delivering the same cooling performance.

● Invisible system

● Wireless option

● Easy retrofit

Wireless radiant floor heating and cooling in retrofitted vintage villa exterior

Need Higher Cooling Performance?

For projects requiring faster cooling response or advanced multi-terminal coordination, explore our upgraded radiant solutions.

Explore Hybrid Radiant + FCU Control Solution Explore Advanced Radiant Climate Control Solution

Advantages

Built for homeowners and developers seeking reliable, long-term value with minimal system complexity.

Lower Total Cost of Ownership

Fewer devices, faster installation, and simplified commissioning reduce upfront project costs — while a streamlined architecture lowers long-term maintenance expenses.
Superior Radiant Comfort

No fan noise, no air drafts, and no visible terminals. Radiant heat transfer delivers consistent temperature distribution and healthier indoor air quality without circulating dust.
Future-Ready Heat Pump Integration

Designed for low-carbon residential heating. The control platform natively supports modern air-to-water heat pumps and remains compatible with evolving renewable-energy-ready system architectures and building regulations.

Related Products

SAS931WCH Wired Multi-Zone Radiant Thermostat and Wiring Centre Kit

LEARN MORE

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 Radiant Thermostat and Wiring Centre Kit

LEARN MORE

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 control centre

Power source:100-240VAC 50/60Hz

max current:10A

Load current output:250VAC 8(5)A

Dimensions:298 x 88 x 64mm

FAQ

Radiant systems operate at lower water temperatures (25-35°C for heating, 15-20°C for cooling) compared to conventional radiator or forced-air systems, significantly improving heat pump COP (Coefficient of Performance) and reducing overall energy consumption.

Pure radiant cooling is best suited for temperate climates with moderate humidity levels (such as the UK, Ireland, and Scandinavia). For high-humidity regions, we recommend evaluating Hybrid (C) or Advanced (D) solutions with integrated dew-point management.

The master controller handles automatic seasonal changeover between heating and cooling modes. Room thermostats independently regulate each zone, ensuring consistent comfort regardless of outdoor temperature fluctuations.

Pure radiant systems maintain stable indoor temperatures even in sub-zero outdoor conditions, provided the heat pump is properly sized for the building's heating load. The hydronic network delivers uniform heat distribution without cold spots.

Yes. The system architecture supports future expansion. If your cooling requirements increase over time, you can integrate fan coil units (Hybrid) or capillary systems (Advanced) without replacing the existing underfloor infrastructure.

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

Tech Support Email: support@saswell.com

Overview

Solution Architecture

Application Scenarios

Advantages

Related Products

SAS931WCH Wired Multi-Zone Radiant Thermostat and Wiring Centre Kit

SAS936BWCH Wireless Multi-Zone Radiant Thermostat and Wiring Centre Kit

FAQ

What are the energy efficiency benefits of pure radiant heating and cooling?

Is radiant cooling effective in humid climates?

How does system stability perform during seasonal transitions?

How does this solution perform in extreme cold conditions?

Can I upgrade from Pure Radiant to Hybrid or Advanced later?