Caleffi iStop anti-freeze valve 1 1/4 inch fluid temperature range 0 to 90 degrees Celsius model 108702

The Caleffi iStop anti-freeze valve 1 1/4 inch fluid temperature range 0 to 90 degrees Celsius model 108702 is an essential protective device engineered for heating and cooling systems. Designed to prevent pipe bursts and costly system damage, this valve automatically discharges water when the medium temperature drops near the freezing point, ensuring reliable operation during cold weather conditions in both residential and commercial installations.

Advantages

This anti-freeze valve offers automated operation without requiring an external power source, relying purely on the temperature of the fluid inside the system. By reacting directly to critical low temperatures, it provides proactive protection against ice formation and subsequent pipe rupture. The robust construction ensures dependable performance over long periods, making it a reliable component for safeguarding critical infrastructure in vulnerable locations.

Suitable for

• Residential heating systems
• Commercial cooling installations
• Protecting outdoor or unheated plant rooms
• Preventing frost damage in closed-circuit water systems

When it may not be suitable

This valve is not designed for open-loop systems where continuous water discharge would disrupt normal operation or water supply levels. It is also unsuitable for systems utilizing mediums other than water, or operating outside the specified temperature and pressure parameters.

Key specifications

• Connection size: 1 1/4 inch
• Fluid temperature range: 0 to 90 degrees Celsius
• Function: Automatic anti-freeze protection via fluid discharge

How to use

The valve must be installed by a qualified professional in the sections of the heating or cooling system most exposed to low temperatures, typically outdoors or in unheated areas. Proper vertical or horizontal orientation should be maintained according to manufacturer guidelines to ensure the thermal element makes accurate contact with the fluid. Ensure the discharge port is routed safely to a drain or collection point to handle expelled water during a freeze event.

What to consider before purchase

• Verify that the 1 1/4 inch connection size matches your existing pipework
• Confirm that your system operating temperatures remain within the 0 to 90 degrees Celsius range
• Ensure an adequate drainage path is available near the installation site for discharged water

Usage recommendations: Regularly inspect the valve and surrounding pipework before and after the winter season to ensure proper mechanical function and clear drainage paths. Avoid painting or insulating the sensing element directly, as this may delay its thermal response to ambient and fluid temperature drops.