The TS-35 is a professional-grade 230V electrothermal actuator engineered for high-reliability multi-zone underfloor heating (UFH) and HVAC control. As UK underfloor heating control specialists, we engineer products for long-term operational reliability. The TS-35 Ascent is backed by our comprehensive five-year warranty and dedicated technical support.

Innovative Commissioning & Emergency Override

• Manual bypass function: Features a unique 90-degree Manually Open (MO) clip that allows for an "Open Status" without requiring electrical power.
• Temporary Emergency Heating: Acts as a vital fail-safe if a room thermostat unexpectedly fails. Engaging the manual clip provides temporary, short-term heating to the affected zone, ensuring the homeowner is not left in the cold while awaiting a replacement part. Subject to floor temperature protection limits.
• Reduced setup time: Significantly reduces time during initial system filling, flushing, and maintenance.
• Easy mounting: Lifting the MO clip reduces internal mechanism tension, enabling the grey collar to thread easily onto the manifold.

High Performance & Precision Control

• Robust driving force: Provides a powerful 130N closing force to ensure reliable valve operation and precise flow control.
• Controlled operation: Utilises a wax-filled capsule expansion principle for smooth opening and closing.

• Anti-water hammer: The gradual expansion (3-5 minutes) prevents sudden pressure shocks or "water hammer" within the pipework by avoiding instantaneous opening.
• System Synergy: Designed to work in perfect conjunction with the Whisper KF Range of wiring centres. This allows the actuator's 3-5 minute opening time to align with the wiring centre's boiler and pump delay logic, ensuring the manifold is fully open before the heat source and circulator engage.

Quick & Easy Installation

• Standardised fitment: Utilises a standard M30 x 1.5mm connection size, ensuring compatibility with a wide range of professional UK manifolds.
• Generous cable length: Supplied with a 1000mm (1m) pre-wired two-core cable for neat routing to the wiring centre.
• Hand-tight security: Designed for tool-free installation to prevent cracking the housing or damaging manifold threads.

Energy & Regulatory Efficiency

• Part L Compliance: Facilitates precise zonal control to support the conservation of fuel and power as mandated by Approved Document L.
• Low power consumption: Operates with a minimal 2.5W power draw to maximise system efficiency.

Versatile Open-Loop Functionality for Heat Pump Efficiency

• Strategic Open-Loop Support: By utilising the manual clip, specific high-thermal-mass areas (such as tiled hallways or bathrooms) can remain mechanically open regardless of thermostat demand. This continuous flow maintains essential system volume and can significantly reduce heat pump short-cycling.
• Future-Proof System Balancing: While open-loop strategies ensure essential heat pump flow rates, homeowner comfort level preference can often be compromised over time. The TS-35 provides an essential fail-safe. Installers can mechanically designate bypass zones using the manual override, knowing that if the customer later requests individual room control, or, if the heat source is updated in the future, full thermostatic regulation can be instantly restored without costly controls upgrades. Individual zone thermostats must be installed in the first instance in accordance with Part L of the building regulations.
• Floor Finish Protection: The manual override must be used with extreme caution. It must not be engaged as a permanent bypass in zones featuring sensitive floor coverings (such as engineered timber, LVT, or laminate). Even during short-term emergency use, locking the actuator open physically bypasses the room thermostat, disabling the floor sensor’s high-limit protection and risking permanent heat damage to the flooring.

Safety & Durable Design

• IP54 protection grade: Rated for high resistance against dust and water splashes in manifold cupboards.
• Visual status indicator: Includes a clear cylindrical pop-up pin; when fully raised, the actuator is in the "On" position.
• Extensively tested: Performance tested to 100,000 cycles, far exceeding the standard EN 60730 requirement of 6,000 cycles.

TS-35 Product Description

The TS-35 Ascent is a professional-grade, 230V electrothermal actuator designed for seamless integration into residential and commercial multi-zone heating systems. Its robust Polycarbonate/ABS housing is rated to IP54, providing essential protection against dust and moisture in demanding environments. The actuator features a unique 90-degree Manually Open (MO) clip at the top of the unit. While this bypass switch accelerates initial system filling and flushing, it also provides a critical homeowner fail-safe, allowing for temporary emergency heating if a room thermostat fails. Furthermore, it also serves as a critical strategic tool for heat pump installations. It allows engineers to mechanically designate permanent bypass zones to maintain minimum flow rates, future-proofing the manifold.

For the installer, the TS-35 is engineered for straightforward fitment. It utilises a standard M30 x 1.5mm threaded collar and is compatible with manifold valve spindles requiring a 3.5mm to 4mm stroke. To ensure a secure and damage-free fit, the grey collar should always be hand-tightened. Once secured, pushing the MO clip down releases the internal spring mechanism to engage the valve. The unit operates via a wax-filled capsule that expands gradually upon receiving a 230V signal, reaching full extension in approximately 3-5 minutes. This controlled movement is essential for preventing water hammer and ensuring the longevity of the pipework.

The TS-35 is a critical component for achieving Building Regulations Part L compliance, enabling the precise zonal control necessary for modern energy conservation standards. It provides a high 130N driving force, ensuring reliable valve closure even in complex HVAC environments. For visual verification, a cylindrical indicator protrudes from the top of the housing when the actuator is in the "Open" position, allowing for rapid status checks during commissioning. Supported by a five-year warranty and a £5,000,000 manufacturing defect indemnity, the TS-35 Ascent combines modern engineering with trade-focused reliability.

If you need help finding the right thermal actuator for your project, call our expert team on 01993 640073.