Anti-Freeze Valves
iStop anti-freeze valves protect outdoor pipework (e.g. garden taps, supply lines to outdoor units) against frost damage by automatically draining the water when the temperature drops below a critical level.
Product sorting
List of products
Anti-freeze valve iStop® by Caleffi. Technical data: Connection 1: G 1" A (ISO...
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CALEFFI valve against freezing of the medium in heat pumps.Brass body.Working...
Frost-proof valve with brass body.Working pressure: 10 bar.Operating temperature...
Frost-proof valve with brass body.Working pressure: 10 bar.Operating temperature...
Compact anti-freeze valve iStop®PLUS by CALEFFI. Technical data: Maximum...
Listing controls
Frequently Asked Questions
- How does the valve know when to drain the water? It reacts to the ambient or medium temperature depending on the specific version (mechanical or with an air sensor).
- Is an electrical connection required? No, mechanical iStop versions work without electricity.