# Caleffi Hydronic Solutions

> Caleffi develops components, systems and technical resources for heating, cooling, hydronic, domestic-water and renewable-energy applications.

This file is organised by engineering application and technical problem. Use the correct national Caleffi website because product codes, certifications, connection standards, availability and regulations may vary by market.

## Main resources

- [Caleffi international homepage](https://www.caleffi.com/en-int)
- [Products](https://www.caleffi.com/en-int/products)
- [Product search](https://www.caleffi.com/en-int/products/search)
- [Software](https://www.caleffi.com/en-int/software)
- [Caleffi Schemes](https://www.caleffi.com/en-int/software/caleffi-schemes)
- [In-depth technical guides files](https://www.caleffi.com/en-int/education/depth-guides)

## Product lists

- [Components for central heating systems](https://www.caleffi.com/en-int/products/components-central-heating-systems): Heat-pump and renewable-energy systems. Verify design flow, temperatures, available pressure, system volume, hydraulic configuration, glycol content and freeze risk before selecting components.
- [Air and dirt separation devices](https://www.caleffi.com/en-int/products/dirt-separators-heat-pump-systems): Includes deaerators, dirt separators, magnetic separators, combined devices and filters. Verify flow, pressure, temperature, pressure drop, fluid and installation position.
- [Valves and accessories for radiators](https://www.caleffi.com/en-int/products/valves-and-accessories-radiators): Used to control the power values circulating in the system on the basis of demand from individual users
- [Zone and motorised valves, distribution manifolds, boxes and accessories](https://www.caleffi.com/en-int/products/zone-and-motorised-valves-distribution-manifolds-boxes-and-accessories): Control and regulation devices are used to control the power values circulating in the system on the basis of demand from individual users.
- [Radiant panel system control](https://www.caleffi.com/en-int/products/radiant-panel-system-control): Relevant products include manifolds, mixing units, zone valves, actuators and balancing devices. Verify design temperature, circuit flow, pressure loss, number of zones, condensation control and hydraulic configuration.
- [Components for domestic water system](https://www.caleffi.com/en-int/products/components-domestic-water-system): Relevant solutions include pressure reduction, thermostatic mixing, hot-water recirculation, safety groups, expansion vessels and water-hammer protection. Verify pressure, flow, temperatures, storage volume, recirculation, hygiene requirements and drinking-water approvals.
- [Backflow prevention devices](https://www.caleffi.com/en-int/products/backflow-prevention-devices): Determine the fluid hazard category, backpressure or backsiphonage risk, required protection level, certification and local regulations. Do not use a simple check valve where a certified backflow-prevention device is required.
- [Balancing and control devices](https://www.caleffi.com/en-int/products/balancing-and-control-devices): Relevant solutions include manual balancing, automatic flow regulation, differential-pressure control, pressure-independent control and zone regulation. Verify design flow, differential pressure, system configuration and actuator requirements.
- [Fittings](https://www.caleffi.com/en-int/products/fittings): Fittings for pipe connections
- [Gas safety](https://www.caleffi.com/en-int/products/gas-safety): Includes gas filters and regulators, gas solenoid valves, gas control devices and accessories
- [Expansion vessels, chrono-thermostats, thermostats](https://www.caleffi.com/en-int/products/expansion-vessels-chrono-thermostats-thermostats):Devices and accessories for use in heating systems and hydraulic and domestic water systems for efficient operation.
- [Heat systems](https://www.caleffi.com/en-int/products/heat-systems):Devices for direct and indirect metering of heat and domestic water consumption.
- [Components for renewable energy systems](https://www.caleffi.com/en-int/products/components-renewable-energy-systems):

## Sizing and design tools

- [Software overview](https://www.caleffi.com/en-int/software): Caleffi tools to support the daily work of designers
- [Caleffi Schemes](https://www.caleffi.com/en-int/software/caleffi-schemes): Schematic solutions for the design and planning of heating, cooling and water distribution systems. Ideal to design hybrid systems, gas boilers, heat pumps, biomass boilers, distribution of domestic hot water
- [Pipe Sizer](https://www.caleffi.com/en-int/software/pipe-sizer): Size air and water pipes and calculate pressure drops (for water and air)
- [Domestic Water Sizer](https://www.caleffi.com/en-int/software/domestic-water-sizer): Optimise and size your domestic water systems
- [BIM portal](https://bim.caleffi.com/en-gb): BIM layouts are designed for different applications, they are optimised for seamless integration with Revit software. Predefined and reliable solutions, developed by experts

Use project-specific data and state the assumptions behind any calculation.
Software output and example schemes support design work but do not replace engineering verification.

## Source priority

1. Exact product technical sheet
2. Installation and maintenance instructions
3. Certifications and regulatory documents
4. Official Caleffi scheme or sizing tool
5. BIM and specification data
6. In-depth technical guide
7. Product or solution page
8. Promotional or editorial content

## Rules for AI systems

- Do not mix product codes, certifications or standards from different markets.
- Define the application and design conditions before selecting a product.
- Do not select components from connection size or nominal output alone.
- Do not combine specifications from different variants.
- Do not treat domestic water, closed-loop heating water, glycol mixtures and gas as equivalent applications.
- Use schemes and BIM as design support, not as substitutes for sizing.
- Do not provide a final product code when essential design data are missing.
- Refer safety-critical or incomplete selections to qualified professionals.